Unigraphics NX8 - Detail Feature

[NX8-HELP] DETAIL FEATURE

1

Detail Feature View a topic Edge Blend Spherical Corner Face Blend Chamfer overview Soft Blend Draft Fillet Draft Body Bridge

1. Edge Blend Use the Edge Blend command to round sharp edges between faces.

You can do the following:    



Add a single edge blend feature to multiple edges. Create an edge blend of constant or variable radius. Add corner setback points to change the shape of an edge blend corner. Adjust the distances of the corner setback points from the corner vertex. You can use corner setbacks to create ball nose blends, for example, and as an aid in sheet metal stamping of nonstyled surfaces. Add stop short points to end an edge blend short of a specific point.

Where do I find it? Application

Modeling

Toolbar

Feature →Edge Blend

Detail Feature

drive24ward (meslab.org/mes)

[NX8-HELP] DETAIL FEATURE Menu

2

Insert →Detail Feature→Edge Blend

1.1.

Create a circular edge blend with constant

radius

1. On the Feature toolbar, click Edge Blend

In the Edge Blend dialog box, Select Edge

or choose Insert →Detail Feature→Edge Blend.

is active.

2. In the graphics window, select edges for the firs t edge set. For this example, two edge strings are selected. selecte d.

Handles are displayed on the selected edges. Tip It is recommended that you blend sets of edges at t he same time, rather than blending edges one at a time. 3. In the Edge to Blend group, from the Shape list, select Circular. 4. In the Radius 1 box, type a value to specify the radius of the first edge set. For this example, the radius of the first edge set is set to 15. 5. Click Add New Set

Detail Feature

to complete the selection of the first edge set.


[NX8-HELP] DETAIL FEATURE Select Edge

3

is active.

6. In the graphics window, select more edges for the second edge set. For this example, two edges are selected for the second edge set.

Handles are displayed on the selected edges. 7. In the Radius 2 box, type a value to specify the radius of the second edge set. For this example, it is set to 20.

8. Click OK or Apply to create the edge blend feature.

Detail Feature



1.2.

4

Create a conic edge blend

1. Click Edge Blend

.

2.

Select a set of edges for the first edge set.

3.

In the Edge Blend dialog box perform the following actions: 1. From the Shape list select Conic. 2. From the Conic Method list select Boundary and Center. 3. Type 3 in the Boundary Radius 1 box. 4. Type 2 in the Center Radius 1 box. 5. Click Add New Set

.

4.

Select a second set of edges for the next edge set.

5. Perform the same actions on the second edge set that you performed on the fist.

Detail Feature



5

6.

Click OK .

1.3.

Create an edge blend of variable radius

This example shows how to create a blend with varying radius by defining points along the edge at which you want to vary the radius of the blend.




is active.

2. Select edges for the edge set.

For this example, three edges are selected for the edge set. 3. In the Edge to Blend group, from the Shape list, select Circular. 4. In the Radius 1 box, type a value to specify the radius

Detail Feature



6

For this example, it is set to 10. 5. In the Variable Radius Points group, click Specify New Location . 6. Click Point

and specify points on the edges where you want to set a va riable radius value.

For this example, two variable radius points are selected on a vertical edge.

7. To specify variable radius values, in the Variable Radius Points group, do the following: a. Click List. The list shows the two selected variable radius points, V Radius 1 and V Radius 2. b. Select V Radius 1 and in the V Radius 1 box, type a value. For this example, it is set to 15. c. Select V Radius 2 and in the V Radius 2 box, type a value. For this example, it is set to 25.

8. Move the location of a variable radius point by choosing a Location option: %Arc Length , Arc Length , or Through Point. For this example, %Arc Length for V Radius 2 is set to 45.

Detail Feature



7

Note If you manually move the point location by changing the value for % Arc Length , the point loses its associativity. 9. Click OK or Apply to create the blend feature with variable radius points.

1.4. Add setback points to an edge blend corner This example shows how to change the curvature of the corner when you blend three or more edges.




is active.

2. Select three edges that intersect at a corner for the edge set.

Detail Feature



8

Handles are displayed on the selected edge set. 3. In the Edge to Blend group, from the Shape list, select Circular. 4. In the Corner Setback group, do the following: a. Click Select End Point . b. Select the vertex point of the blend corner that has three edges. A corner setback with default values is displayed at the vertex, and is aligned along the three edges.

c. Click List to display the setback points. d. Select each setback point from the list and change the value in the Point Setback box. For this example, Point 2 Setback 1, Point 2 Setback 2 , and Point 2 Setback 3 are changed to 15, 20, and 25, respectively.

Detail Feature



9

The new setback distances change the shape of the corner. 5. Click OK or Apply to create the blend with setback corners.

1.5. Stop an edge blend short of a corner



or choose Insert → Detail Feature→ Edge Blend.

is active.

2. In the graphics window, select edges for the firs t edge set.

Detail Feature



10

For this example, one edge string is selected.

3. In the Edge to Blend group, from the Shape list, select Circular. 4. In the Radius 1 box, type a value to specify the radius of the first edge set. For this example, the radius of the first edge set is set to 10. 5. In the dialog box, in the Stop Short of Corner group, do the following: a. From the Stopping Location list, select At Distance. b. Click Select End Point the blend.

and select end points on the edge set where you want to stop

The Location and Arc Length options appear.

Handles are displayed at the selected end points. c. In the Location list, select Arc Length. d. Click List to display the list of stop short points. e. Select Stopshort1 and type a value in the Arc Length box. For this example, it is set to 10. f. Select Stopshort2 and type a value in the Arc Length box. For this example, it is set to 30.

Detail Feature



11

The stop short points are moved to the specified dist ances. 6. Click OK or Apply to create the blend.

1.6.

Edge Blend dialog box

Edge to Blend

Lets you select edges for an edge blend set. Select Edge

Lets you specify the underlying shape for the cross section of the blend. Choose from the following shape options: Shape

Circular

Uses a single handle set to control a circular shaped blend.

Detail Feature



12

Conic

Conic methods and handle sets control combinations of symmetric boundary edge radius, center radius, and rho value to create a conical blend.

Available when Shape is set to Conic. Lets you create symmetric conic blends using advanced methods to control the blend shape. Boundary and Center

The conic blend section is defined by specifying a symmetric boundary radius and a center radius.

Conic Method

Boundary and Rho

The conic blend section is defined by specifying a symmetric boundary radius and a value for rho.

Detail Feature



13

Center and Rho

The conic blend section is defined by specifying a center radius and a value for rho.

Available when Shape is set to Circular. Sets a value for the radius for all the edges in the edge set. Radius x

Note The radius must be consistent with the geometry of the faces being blended. For example, it must be possible to move away from all points in the second face by at least the distance specified by the given radius.

Boundary Radius x

Available when Shape is set to Conic and Conic Method is set to .Boundary and Center and Boundary and Rho. Sets a value all boundary radii in the edge set.

Center Radius x

Available when Shape is set to Conic and Conic Method is set to Boundary and Center and Center and Rho. Sets a value for all center radii in the edge set.

Rho x

Available when Shape is set to Conic and Conic Method is set to .Boundary and Rho and Center and Rho. Sets a value for the rho in the edge set.

Variable Radius Points

Creates a variable radius blend by adding points with unique radius values to an edge blend. Available when you select an edge using Select Edge in the Edge to Blend group. Specify New Location

Detail Feature

Lets you add points and set radius values along edges in an edge set.


[NX8-HELP] DETAIL FEATURE Note





14 You can define a variable radius point location that is not on the blend edge. NX automatically projects it to the edge. Variable radius points are associative. If you move the associated point when the part is updated, the variable radius location moves with it. If you delete the point, the variable radius location for that point continues to exist (as a percent of arc length), but is no longer associative.

Available when you select a variable radius point. Sets the radius at the selected point. xx is the number representing the variable radius point.

Note You can change the radius values in the graphics window. V Radius xx

Variable radius points with drag handles

Available when you select a variable radius point. Lets you specify one of the following options to position the variable radius point on the edge. Arc Length

Sets the specified value for the arc length. Enter the distance values in the Arc Length box. Sets variable radius point as a percent of total edge arc length.

% Arc Length

Enter the distance values in the % Arc Length box. Location

Through Point

Lets you specify a variable radius point.

Specify New Location

options are available.

Note You can also do the following:  

Drag the variable radius point handle along the edge. Type values in the on-screen input box.

Note If you manually move the point location by changing the value for % Arc Length, the point loses its associativity. Tip Right-click a point handle to toggle between Arc Length and % Arc Length .

Detail Feature



15

Corner Setback

Lets you select a corner end point in an edge set and displays a drag handle at each edge.

Select End Point

Use the drag handles to increase the corner radius values as required. Note Do not use this option for creating curvature continuous faces. Sets the distance for the currently selected setback point to the value you specify. Point 1 Setback 1

Note The option Point 1 Setback 1 corresponds to the first point set and the first set back. The number varies according to the point set and the edge you select.

Stop Short of Corner

Stops an edge blend at a point short of the end of the edge. Lets you select a blend end point and the stopping location on an edge to be blended. Select End Point

After you select the edge end point, you can specify the Stopping Location. Available when you select an end point. 

At Distance stops the blend short of the edge end point.



Stop Short of Corner using At Distance

Stopping Location list 

At Intersection stops a blend at the selected vertex where multiple blends intersect.

Note You cannot use At Distance at an end point where edge blends intersect. Tip Use At Intersection to create multiple edge blends at a complex vertex, where the default resolution is likely to fail, s o that blend-to-blend intersections can be resolved using a manually create d patch. Available when you select an end point in the Select End Point group. Location list

Detail Feature



Arc Length lets you specify a value for arc length at which you want to select a stop point. drive24ward (meslab.org/mes)

[NX8-HELP] DETAIL FEATURE 



16

% Arc Length lets you specify the percentage of the arc length at which you want to select a stop point. Through Point lets you select a point on the model.

Specify Point


Trimming

Trims an edge blend to a selected face or plane.

Before and after trimming

User Selected Objects

When selected, opens the following options to let you specify objects and locations to use to trim blend faces. Lists methods for trimming the edge blend with specified objects. The limiting plane, face, or edge set (or its extensions) becomes the end cap for the blend. Plane

Trims the edge blend with one or more planes in face sets.

Limit Object

Specify Plane

Lets you specify planes to trim the blend. Face

Detail Feature

Trims the edge blend with one or more faces in f ace sets



17

Select Face

Lets you specify faces to trim the blend. Edge

Trims the edge blend with one or more edges in edge sets.

Select Edge

Lets you specify edges to trim the blend. Available when Trim Object is set to Plane or Face. Use Limit Plane to Cap Blend / Use Limit Face to Cap Blend

Caps the blend using a plane or face.

Specify Point


Specify a point nearest to the intersection where you want the blend capped. Use this method if the trim plane intersects the blend face in more than one location. Available when Limit Object is set to Plane. Specify Point Specifys a point nearest to the intersection where you want the blend capped. Use this method if the trim plane intersects the blend face in more than one location. Overflow Resolutions

Detail Feature



18

Controls how blend overflows are handled. Blend overflow occurs when tangent edges of a blend encounter other edges on the solid. Allowed Overflow Resolutions

Allows the blend to extend to a smoothly connected (tangent) face that it encounters.



Roll Over Smooth Edges

A new blend that overflows the edge of an existing blend. The edge where the blends meet is smooth and shared.



When you select Roll Over Smooth Edges the edge is sharp and shared. Removes tangency with one of the defining faces, and allows blend to roll onto any edge, whether smooth or sharp.

Roll on Edges (Smooth or Sharp) 

With the option selected, the edge remains unchanged and its tangency with the face owning that edge is removed.

Detail Feature



19



With the option not selected, the edge is changed and tangency with its owning face is maintained. Allows the blend to maintain tangency with the defining faces, and moves any encountered edges to the blend face.



Maintain Blend and Move Sharp Edges

Preview of edges with the option selected.



The blend tangency is maintained. Explicit Overflow Resolutions

Controls whether the Roll On Edges (Smooth or Sharp) overflow option is applied to a selected edge.

Lets you select an edge on which you want to force the Roll On Edges (Smooth Select Edge to Force or Sharp) option. Roll on

Detail Feature



20

Lets you select an edge on which you do not want to apply the Roll On Edges (Smooth or Sharp) option.

Select Edge to Prohibit Roll on

For this edge blend, an encountered edge is selected with Select Edge to Prohibit Roll on option. This will prevent the Roll On Edges (Smooth or Sharp) option being applied to it. The Roll On Edges (Smooth or Sharp) option is applied to the edge of the other cylinder as usual. Settings Overlapping Blends Within Feature

Consists of the Resolution and Blend Order lists. Specifies how overlapping blends are resolved. This option differs from those with Overflow Resolutions in that it only affects the interaction of edges within a single edge blend f eature. Overflow Resolutions can be effective for any edge, including blend edges. 

Resolution list 



Maintain Blend and Intersect ignores that the blend is intersecting itself. Both parts of the blend are trimmed by the intersection curve. When you open parts with blends made in early versions of NX, the y are assigned this option. If Different Convexity, Roll Over makes the blend roll over itself. Use this option to roll the blend over itself when the convexity is different as the blend encounters a portion of itself. Regardless of Convexity, Roll Over makes the blend roll over itself when the blend encounters a portion of itself, regardless of what the convexity is.

Specifies the order in which blends are created.

Blend Order list

It is recommended that you try this option to create blends in situations where they would otherwise fail.  

Convex First creates the convex blends before concave blends. Concave First creates concave blends before convex blends.

Blends all the instances in an array when you select one instance to blend. Blend All Instances

Detail Feature

Tip



For instanced features, it is recommended that you add the edge blend to the master feature, and not one of the instanced features. This is to drive24ward (meslab.org/mes)




21 make sure that the edge blend will alwa ys remain visible in the instance set even if the array parameters are later changed. When creating instances, it is recommended that you first create the parent feature and the edge blend and then create the instance features. See Group Feature and Instance for details.

Allows an alternate blend for some cases where edges form a Y-shape at a vertex. Use this option to get a different shape for blends that meet the following criteria   

The blends are of opposite convexity. The blends meet at three or more edge vertices. One blend rolls over the other.

Special Blend at Convex/Concave Y

Alternate blend shape at vertex using Special Blend at Convex/Concave Y

Replaces intersections of the blend with itself with a smooth surface patch. The patch area is not a true representation of a blend produced by a rolling ball, but it is tangential to all the surfaces with which it connects. Remove Surface Self-Intersections

This solution may allow an otherwise self-intersec ting blend to be created but it may be costly to produce the patched surface. If you have not selected Remove Surface Self-Intersections option, make sure that the offsets of the surfaces attached to the faces meeting at the edge to be blended do not self intersect. These offsets of the surfaces attached to the faces must intersect to define a "spine" curve for the blend. Specifies whether setbacks are included in the edge blend corner or if they are kept separate.

Corner Setback

Include with Corner includes the setback in the corner

Detail Feature

Separate from Corner keeps the setback separate. drive24ward (meslab.org/mes)


22

Lets you specify a distance tolerance for non-constant radius blends. Otherwise, the default distance tolerance from Modeling Preferences is used. For more information, see Modeling Preferences.

Tolerance

Tip If you are adding a blend to an edge that is alr eady tolerant or across a tolerant edge, the blend must be greater than twice the tolerance on the edge or the edge being crossed.

1.7.

Edge Blend Allowed Overflow Resolutions

1. On the left side of the animation, click

to select a part type.

2. From the menu on the right, click to select an edge type. 3. In the dialog box, try different combinations of overflow resolutions.

1.8.

Hierarchy for Allowed Overflow Resolutions in

edge blends Precedence when combining Allowed Overflow Resolutions options

Detail Feature


[NX8-HELP] DETAIL FEATURE Blend Conditions

23 Roll Over Smooth Edges

Roll On Edges (Smooth or Sharp)

Maintain Blend and Move Sharp Edges

Edge Being Blended Encountered Edge

When the convexity of the encountered Used First edge is opposite that of the blended edge, and the encountered edge is smooth.

Used Second

Not used

When the convexity of the encountered Not used edge is opposite that of the blended edge, and the encountered edge is sharp.

Used First

Used Second

When the convexity of the encountered edge is the same as that of the blended edge, and the encountered edge is smooth.

Used Third

Used Second

Detail Feature

Used First


[NX8-HELP] DETAIL FEATURE When the convexity of the encountered Not used edge is the same as that of the blended edge, and the encountered edge is sharp.

24 Used Second

Used First

2. Face Blend Use the Face Blend command to add tangent blend faces between two or three sets of faces. The cross section of the blend can be circular, conic, or law controlled. This example shows a three-face blend along a variable-width rib, and two – face blends on both sides of the rib.

You can do the following:      

For two – face blends, specify the blend cross section using several methods. For two – face blends, select curves to control the tangent lines of the blend. Create blends between faces that are not adjacent or are from different bodies. Create blends as separate sheet bodies without sewing them to existing bodies. Create symmetric and asymmetric conic blends with aesthetically balanced shapes. Trim the ends of the blend to selected faces or locations.


Modeling

Detail Feature


[NX8-HELP] DETAIL FEATURE Toolbar

Feature →Face Blend

Menu

Insert →Detail Feature→ Face Blend

2.1.

25

Create a rolling ball face blend with a constant

radius This example shows how to create a rolling ball face blend on two intersecting sheet bodies.

1. On the Feature toolbar, click Face Blend , or choose Insert →Detail Feature →Face Blend. 2. In the graphics window, select the first face chain and click the middle mouse button to complete Face Chain 1.

3. (Optional) If the normals of a face chain do not point toward the approximate center of the blend, click Reverse Direction . 4. In the graphics window, select the second face chain and click the middle mouse button to complete Face Chain 2.

5. In the Cross Section group, do the following: a. From the Section Orientation list, select Rolling Ball. b. From the Shape list, select Circular.

Detail Feature



26

c. From the Radius Method list, select Constant . d. In the Radius box, type a value. For this example, the radius is set to 20. 6. In the Trim and Sew Options group, do the following: a. From the Blend Faces list, select Trim to All Input Faces. b. Select the Trim Input Faces to Blend Faces check box. c. Select the Sew All Faces check box. 7. Choose another command or click Apply to create the blend.

2.2.

Create a swept section face blend

This example shows how to create a swept section face blend with a law controlled radius.

1. On the Feature toolbar, click Face Blend or choose Insert →Detail Feature →Face Blend. 2. From the Type list, select Two Defining Face Chains. 3. Select the first face and click the middle mouse button to complete Face Chain 1.

4. Select the second face in the graphics window.

Detail Feature



27

5. (Optional) If the normals of the two face sets do not point toward the approximate center of the blend, click Reverse Direction . 6. In the Cross Section group, do the following: a. From the Section Orientation list, select Swept Section . b. Select Select Spine Curve

and select an edge parallel to the blend you want to create.

The spine curve is used for orienting the blend cross section and for defining varying parameters for the law controlled radius. c. d. e. f.

From the Shape list, select Circular. From the Radius Method list, select Law Controlled. From the Law Type list, select Linear. Specify values for Start and End. For this example, Start and End are set to 50 and 80, respectively.

7. In the Settings group, clear the Terminate at Sharp Edge check box. This allows the blend to cross the crease in the first face chain. 8. Choose another command or click Apply to create the blend.

Detail Feature



2.3.

28

Create a face blend with an asymmetrical conic

cross section This example shows how to create a conic cross section face blend.

1. On the Feature toolbar, click Face Blend , or choose Insert →Detail Feature →Face Blend. 2. From the Type list, select Two Defining Face Chains. 3. Select the first face and click the middle mouse button to complete the Face Chain 1.

4. Select the second face in the graphics window.

5. (Optional) If the normals of the two face sets do not point toward the approximate center of the blend, click Reverse Direction . 6. In the Cross Section group, do the following: a. From the Section Orientation list, choose Swept Section . b. Select Select Spine Curve

and select an edge parallel to the blend you want to create.

The spine curve is used for orienting the blend cross section and for defining varying parameters for the law controlled radius.

Detail Feature



29

c. From the Shape list, choose Asymmetric Conic. d. From the Offset 1 Method list, choose Constant . e. Specify a value for the Offset 1 Distance For this example, it is set to 50. f. From the Offset 2 Method list, select Constant. g. Specify a value for the Offset 2 Distance For this example, it is set to 30. h. From the Rho Method list, select Constant . i. Specify a value for the Rho. For this example, it is set to 0.3. Tip You can experiment with the Offset 1 Distance, Offset 2 Distance , and the Rho values by dragging their respective handles and observing the effect on the blend preview. 7. Choose another command or click Apply to create the blend.

2.4.

Create a face blend with a tangent curve

This example shows how to create a face blend that is tangent along the curve to a face without trimming the existing input faces.

Detail Feature



30

1. On the Feature toolbar, click Face Blend , or choose Insert →Detail Feature →Face Blend. 2. From the Type list, select Two Defining Face Chains. 3. Select the first face and click the middle mouse button to complete face chain 1.

4. Select face chain 2 in the graphics window.

5. (Optional) If the normals of the two face sets do not point toward the approximate center of the blend, click Reverse Direction . 6. In the Blend Cross Section group, do the following: a. From the Section Orientation list, choose Rolling Ball. b. From the Shape list, choose Circular.

Detail Feature



31

c. From the Radius Method list, choose Tangency Constraint. 7. In the Constraining and Limiting Geometry group, click Select Tangent Curve the curve as shown.

and select

8. In the Trim and Sew Options group: a. From the Blend Faces list, choose Trim to All Input Faces . b. Clear the Trim Input Faces to Blend Faces check box. 9. Choose another command or click Apply to create the blend.

2.5.

Create a three-face blend

This example shows how to create a three-face blend along a variable-width rib.

Detail Feature



32

1. On the Feature toolbar, click Face Blend , or choose Insert →Detail Feature →Face Blend. 2. From the Type list, select Three Defining Face Chains . 3. In the graphics window, select the first outside face chain and click the middle mouse button to indicate that the face chain is complete.

4. (Optional) If the normals of a face chain do not point toward the approximate center of the blend, click Reverse Direction . 5. Select the second outside face chain and click t he middle mouse button to indicate that the face chain is complete.

Detail Feature



33

6. Select the middle face chain.

7. In the Trim and Sew Options group, do the following: a. From the Blend Faces list, select Trim to All Input Faces. b. Ensure that the Trim Input Faces to Blend Faces check box is selected. c. Ensure that the Sew All Faces check box is selected. 8. Choose another command or click Apply to create the blend.

2.6.

Choose a face blend from multiple solutions

When creating face blends, NX displays multiple solutions depending on the options you select in Trim and Sew Options. In this example, after the input faces are selected, there are two possible solutions for the blend.

To select one of the solutions, do the following:

1. In the Face Blend dialog box, click Specify Point . 2. In the graphics window, click next to the solution that you want. In this example, the solution with the normals is selected. The preview is updated to show only the solution you choose.

Detail Feature



34

3. Choose another command or click Apply to create the blend.

2.7.

Face Blend dialog box

Type Two Defining Face Specifies whether you are blending two face chains or three face chains. Chains Three Defining Face Chains Face Chains

Lets you select the first and second sets of face chains. Select Face Chain 1

For a two – face blend, you can click a shared edge to sel ect all the faces in both face chains.

Select Face Chain 2

For a three – face blend, lets you select the middle face chain or a plane. Select Middle Face or Plane Cross Section Section Orientation

Rolling Ball

Creates a rolling ball face blend that resembles a surface created by a rolling ball in constant contact with the input faces. The plane of the cross section is defined by the two contact points and the center of the ball.

Swept Section

Creates a swept section blend whose surface is controlled by a cross section swept along the length of the spine curve, while normal to the spine curve.

Detail Feature



Select Spine Curve

35

Available when you select Swept Section from the Section Orientation list, or when you specify Law Controlled for the Radius Method. Lets you specify a spine curve for swept section blends or non-swept s ection blends that use Law Controlled for the Radius Method. All swept section blends require a spine curve to orient and sweep the cross section. If you specify Law Controlled for the Radius Method , then the same spine is used for defining varying parameters.

Shape

Available when Type is set to Two Defining Face Chains. Lets you specify the underlying shape for the cross section of a two f ace blend. Choose from the following shape options: Circular

Uses a single handle to control a circular shaped blend.

Symmetric Conic

Uses a single set of handles to simultaneously control both edges of the blend and create a conical blend with symmetry.

Detail Feature



36

Asymmetric Conic

Uses individual handles to control conical blend edges, varying the blend along each edge.

Conic Method

Available when Shape is set to Symmetric Conic. Lets you create symmetric conic blends using advanced methods to control the blend shape. Boundary and Center

The blend is defined by specifying the boundary and center of the conic section.

Boundary and Rho

The blend is defined by specifying the boundary and rho of the conic section.

Detail Feature



37

Center and Rho

The blend is defined by specifying the center and rho of the conic section.

Radius Method

Available when Shape is set to Circular. 





Detail Feature

Constant — Keeps the blend radius constant except where you select a tangent constraining curve.

Law Controlled — Varies the blend radius based on two or more individual points along a spine curve according to Law Type and Value. For details, see Law Types.

Tangency Constraint — Varies the blend radius so that its tangent line is the curve or edge you select. The curve must lie wit hin one of the defining face chains.



38

Boundary Method Available when Shape is set to Symmetric Conic.

Specifies how to define a symmetrical conic blend usi ng a boundary parameter.  

Constant — Lets you set a fixed value for the Boundary Radius. Law Controlled — Sets the boundary of the cross section of the blend along a spine curve according to the Law Type and Value.

For details, see Law Types. Note Not available when the Conic Method is set to Center and Rho. Boundary Radius

Available when Boundary Method is set to Constant . Lets you specify a fixed value for the radius of the blend boundary.

Center Method

Available when Shape is set to Symmetric Conic. Specifies how to define a symmetrical conic blend usi ng a center parameter.  

Constant — Lets you set a fixed value for the Boundary Radius. Law Controlled — Sets the boundary of the cross section of the blend along a spine curve according to the Law Type and Value.

For details, see Law Types. Note Not available when the Conic Method is set to Boundary and Rho . Center Radius

Available when Center Method is set to Constant . Lets you specify a value for the radius of the blend from the center of the section.

Offset 1 Method

Available when Shape is set to Asymmetric Conic. Sets the method for the conic offset. You can sele ct Constant or Law Controlled for each conic offset.

Offset 1 Distance

Available when Shape is set to Asymmetric Conic. Sets the distance of the conic offset from the first face.

Offset 2 Method

Available when Shape is set to Asymmetric Conic. Sets the method for the second conic offset. These input boxes define distances for offsets 1 and 2 when you choose the Constant method.

Offset 2 Distance

Available when Shape is set to Asymmetric Conic. Sets the distance of the conic offset from the second face.

Detail Feature


[NX8-HELP] DETAIL FEATURE Rho Method

39

Available when Shape is set to Symmetric Conic or Asymmetric Conic. Specifies rho for conic cross sections.  

Constant — Sets — Sets a constant value for rho. — Sets the blend cross section along the spine curve Law Controlled — Sets according to the Law Type and Value.

For details, see Law Types. Types. 

Automatic Ellipse — Sets — Sets a circular blend cross section or an ellipse of least eccentricity.

Note Not available for Symmetric Conic when the Conic Method is set to Boundary and Center . Rho

Available when:  

Shape is set to Symmetric Conic or Asymmetric Conic Rho Method is set to Constant

The value of Rho has the following effects on the cross section: 0 < rho < 0.5 Cross section is an ellipse. As rho r ho approaches zero, the blend tends towards being flat and resembles a chamfer. rho = 0.5 Under Settings, if the Rho Type is set to Absolute, the cross section is a parabola. If Rho Type is set to Relative, the cross section is an ellipse of least eccentricity. 0.5 < rho <1 The cross section is a hyperbola. As rho approaches 1, the blend becomes more L-shaped. Law Type

Available when you select Law Controlled as an offset, center, or radius method. For details regarding law sub options that may appear, see Law Types. Types.

Value

Available when any of the following is set to Law Controlled:   

Radius Method Boundary Method Center Method

and... 

Law Type = Constant

Lets you enter a value for the law.

Detail Feature



40

For details, see Law Types. Types. Constraining and Limiting Geometry

Lets you roll the blend along an edge. Select Coincident Curve

When you select this option, the blend rolls on the edge tangent to the face. The blend radius remains constant.

and does not remain

Coincident Curves list

Specifies whether the constraining curve is on the first or second face chain. Lets you select a curve along which the blend maintains tangency with the face set. Select Tangent Curve

The blend is tangent to the face at

along the curve.

For circular blends, you can define the radius with a tan gent curves string. For conic blends, the offset opposite the wall containing the tangent curve str ing is computed as the smallest offset defined by the tangent curve string or the constant or variable offset. Tangent Curves list

Specifies whether the constraining curve is on the first or second face chain. Available when the following are set: Select Middle Tangent Object

  

Section Orientation = Swept Section. Shape = Circular. Radius Method = Law Controlled.

Makes the blend tangent to three sets of faces. f aces. Tangency faces constrain the blend so that the geometry dictates the blend radius. Siemens PLM Software recommends that you use the Three Defining Face Chains type rather than Select Middle Tangent Object to create three-face blends.

Detail Feature



41

Trim and Sew Options

Lets you specify how you want NX to trim and or sew the blend into the part. Blend Faces list

Lists options to trim blend faces. The following sheet bodies are blended with various trim and sew options.

Trim to All Input Faces Trim Input Faces to Blend Faces is selected Sew All Faces is cleared

Trim to Long Input Faces Trim Input Faces to Blend Faces is selected Sew All Faces is selected

Trim to Short Input Faces Trim Input Faces to Blend Faces is selected

Detail Feature



42

Sew All Faces is cleared

Do Not Trim Input Faces Trim Input Faces to Blend Faces is selected Sew All Faces is selected

or Trim Input Faces to Blend Faces is cleared Sew All Faces is selected

For sheet bodies, you can trim the participating faces and the blend without stitching the blend. Overriding Trim Objects User Selected Objects

When selected, opens the following options to let you specify objects and locations to use to trim blend faces.

Limit Object

Lets you specify the type of object to use to li mit the blend. Plane Lets you stop the blend between its start or end using planes.

You can use this option to trim a face blend and to create end cap faces.

Specify Plane

Lets you specify or select planes to trim the blend. The right side of the following solid body shows a preview of two

Detail Feature



43

planes trimming a face blend during creation. The left shows how the trimmed blend would look after creation.

Note that you may need to reverse the plane direction normals to get the desired portion of the face blend to trim.

Specify Point

Lets you select a point to specify the portion of the blend to trim when there are multiple possible trim solutions. Face

Lets you trim the blend between the start or end usi ng a face. The selected face or its extension becomes the end cap for the blend.

Select Face

Lets you select faces to trim the blend at start and end positions. Edge

Lets you trim the blend between the start or end usi ng an edge. The selected edge or its extension becomes the end cap for the blend.

Select Edge

Lets you select edges to trim the blend at start and end positions.

Reverse Direction

Lets you reverse the direction of the plane, face or edge limiting object. Use Limit Plane to Creates an end cap face based on a trimming plane or face. Cap Blend, If this option is off, the trim plane or face is used only as a trimming location object. Use Limit Face to The end cap face is the plane or face that contains the trim location point and a blend Cap Blend

Detail Feature



44

face isoline, as shown in the following graphic.

If this option is selected, NX uses the plane or face for both the trimming location and the end cap as shown in the following graphic.

Add New Set

Lets you define sets of planes, faces, or edges as limiting objects for the face blend.

List

Lists the plane, face, or edge limiting object se ts you have defined, with their name, number and expression information. Remove

Lets you delete limiting object sets you have defined. Settings Add Tangent Faces as Encountered

Available when Section Orientation is set to Rolling Ball. Automatically adds tangent faces to the input face chain as needed. In the following example, the input faces are green. Face Blend automatically selects the blend along tangent faces (red), but stops at face tangent.

Orient Cross Section by Isoparameter Lines Terminate at Sharp Edge

because it is not

Available when Section Orientation is set to Swept Section. An isoparametric blend is a specialized blend and is recommended for turbine blades because the blend may produce good results when other blend types fail. Allows a face blend to extend past a notch in the middle or at the end of a blend. Use this option to stop a face blend when it en counters a localized feature, like a notch, that has a sharp edge. The following part is the input shape.

Detail Feature



45

When you clear the Terminate at Sharp Edge check box for the blend, the notch is ignored and is used to trim the face.

When you select the Terminate at Sharp Edge check box, the blend does not extend beyond the notch.

Rho Type

Available when, in the Cross Section group, Shape is set to Asymmetric Conic. Specifies the type of rho for conic cross sections. 



Remove Self Intersection

Relative — Sets a rho value that is relative to the angle subtended by the blend. A value of 0.5 will give the blend cross section of an ellipse of least eccentricity. Absolute — Sets a rho value that is independent of the angle subtended by the blend.

Available when Type is set to Rolling Ball and Shape is set to Circular. Replaces face chains which cause self-intersections in the blend with a patch. The patch area is not a true representation of a blend produced by a rolling ball, but it is tangent to all of the surfaces to which it connects.

Blend Across Sharp Edges

Propagates face blends across slightly non-tangent edges. Use this when you have slightly sharp edges that a face bl end needs to cross, such as parting edges.

Maximum Edge Angle

Available when Blend Across Sharp Edges is selected. Specifies the maximum edge angle over which the blend is allowed to propagate.

Detail Feature



46

Determines the fit accuracy of the blend to the defining faces.

Tolerance

This determines the degree of smoothness required for transitions from one face to another. The edge of the blend created on the adjoining face cannot deviate from the edge of the blend on the current face by more than the tolerance. The default value is the distance tolerance modeling preference.

2.8.

Rho and the shape of conic face blends

The blend cross section changes with the value of rho as follows: 





If the value of rho is between zero and 0.5, the cross section is an ellipse. As rho approaches zero, the blend becomes flatter and resembles a chamfer. If rho is equal to 0.5 and, under Settings, if the Rho Type is set to Absolute, the cross section is a parabola. If Rho Type is set to Relative, the cross section is an ellipse of least eccentricity. If the value of rho is between 0.5 and 1, the cross section is a hyperbola. As the value of rho approaches 1, the blend has a sharper corner.

If the Rho Method is set to Automatic Ellipse and the offsets are equal, the blend has a circular cross section. If the offsets are not equal, the blend has an elliptical cross section. Rho Value

Face blend cross section

0.2

0.5

0.8

Detail Feature



47

3. Soft Blend Use the Soft Blend command to create tangent and curvature continuous blend faces between selected sets of faces.

You can do the following:     

Make blends with better aesthetics than other bl ends as the cross section is not circular. Control the cross sectional shape. Create designs with lower weight. Create designs that have better stress resistance properties. Choose various options to trim and attach the blend to the faces.


Modeling

Toolbar

Feature →Soft Blend

Menu

Insert →Detail Feature→Soft Blend

3.1.

Create a soft blend sheet between two surfaces

1. On the Feature toolbar, click Soft Blend

, or choose Insert →Detail Feature→Soft Blend.

In the Soft Blend dialog box, under Selection Steps, First Set

Detail Feature

appears selected.



48

2. In the graphics window, select the face containing the fir st tangency curve.

An arrowhead appears normal to the surface.

3. Click Second Set tangency curve.

, and in the graphics window, select the face containing the second

An arrowhead appears normal to this face. Note The face normals should point towards the approximate arc center of the blend. If they do not, click Reverse Normal to change the face normals.

4. Click First Tangency Curve

5. Click Second Tangency Curve curve.

Detail Feature

, and in the graphics window, select the first tangency curve.

, and in the graphics window, select the second tangency



49

6. Click Define Spine String. The Spine dialog bar opens. 7. In the graphics window, select the spine.

8. In the Spine dialog bar, click OK to accept the spine. The Spine dialog bar closes. 9. Click OK or Apply to create the soft blend.

3.2. Soft Blend dialog box Selection Steps

Lets you select the first set of faces of the face blend. First Set

Lets you select the second set of faces of the face blend. Second Set

Lets you select a string of curves that lies on the selected face and becomes the edge of First Tangency the blend. Curve

Second Tangency Curve

Detail Feature

Lets you select a string of curves that lies on the selected face and becomes edge of the blend.



50

Reverse Normal

Lets you reverse the direction of the face normal that is displayed after you choose a face set. Tip The face normals should point towards the center of the blend. Attachment Method list

Specifies a trimming and attachment method for the soft blend. Note When you edit a soft blend, you can change the attachment method in either of the following groups from the list:  

Trim & Attach All, Trim Long & Attach All, and No Trim & Attach All . Trim Blend, Trim Blend Short, Trim Blend Long, and No Trim.

The following graphic shows attachment method examples that use the surfaces and curves.

Trims the blend and attaches it to the underlying sets of faces.

Trim & Attach All

Note If you use the Trim & Attach All attachment method across multiple bodies, and want to edit the blend using Edit Using Rollback , you must select at least one face of the original target body for the First Set. Creates a blend as long as possible, attached to the underlying sets of faces.

Trim Long & Attach All

The trimmed blend sheet has end boundaries that are constant paramete r lines determined by the wall boundaries.

Detail Feature



51

Creates an untrimmed blend sheet or a sheet trimmed by specified limiting planes, and attaches the sheet to the underlying sets of faces.

No Trim & Attach All

Trims the blend and the underlying face sets, but does not attach t he blend to the faces.

Trim All

Trims the blend sheet only to the limiting edges of the underlying face sets or specified limiting planes.

Trim Blend

Trims the blend as short as possible.

Trim Blend Short

The blend end boundaries are constant parameter lines of the wall boundaries. Makes the blend as long as possible.

Trim Blend Long

The end boundaries are the constant parameter lines determined by the wall boundaries.

Detail Feature



52

Generates an untrimmed blend sheet or a sheet trimmed by specified limiting planes.

No Trim

Smoothness

Matches only the tangents of the blend and faces, or matches the curvature (which also matches the tangents).

Match Tangents

Matches the adjacent walls in tangency only.

Match Curvature

Matches both tangency and curvature.

Available when you select Match Curvature. Rho

A small value (near zero) will give a flattened blend. A large value (near one) will give a sharply peaked blend. Available when you select Match Curvature.

Constant

Sets a constant value along the entire law function for Rho. Available when you select Match Curvature. Law Controlled

Opens the Law Function dialog box where you can select the law that specifies the curvature of the blend. For more information, see Law Types. Available when you select Match Curvature.

Skew

A small value (near zero) gives a blend whose peak is near the first wall. A large value (near one) puts the peak near the second wall. Available when you select Match Curvature.

Constant

Sets a constant value along the entire law function for Skew. Law Controlled

Detail Feature

Available when you select Match Curvature.



53

Opens the Law Function dialog box. For more information, see Law Types. Define Spine String

Lets you define the spine string for the soft blend.

Limit Start / Limit End

Lets you define planes to trim the blend at the st art and the end for the Trim Blend and No Trim Attachment Method . If no limiting planes are chosen, the blend is tr immed between the selected faces.

Tolerance

Sets a tolerance for the fit accuracy of the blend to the faces. Tolerance also determines the degree of smoothness required for transitions from one face to another.

Confirm Upon Apply

Opens the Confirm Upon Apply dialog box after you choose Apply. You can preview the results, and accept, reject, or analyze the results.

3.3.

Comparing Soft Blend, Edge Blend, Face Blend,

and Bridge Soft Blend

Edge Blend

Face Blend

Bridge

The blend is

Sheet or Solid body

A solid or sheet body blend on a shared edge of two faces

Either a solid or sheet Sheet body connecting any body depending on two faces of either sheet the base part bodies or solid bodies.

Blend can be of circular crosssection

Yes

Always

Yes

No

Blend can have non-circular cross-section

Yes

No

Yes, but only conic

Yes.

Can constrain a blend with tangent curves

Necessary

No

Optional

No

4. Fillet This option lets you create fillet sheets of constant or variable radius between two faces. You can create a fillet between the faces of a solid and/or sheet bodies.

Detail Feature



54

A fillet is created tangent to two faces. However, for the fillet to be created, the faces must intersect or be close enough so that the fillet touches both faces at all points of tangency. Note When you are creating a fillet between two spherical or cylindrical faces, the faces do not need to intersect. There are four possible quadrants in which the fill et can be created. You specify the quadrant for the fillet by making the normals to the two faces point in the direction of the desired quadrant. The spine curve acts as a guide for the fillet. You can choose to create a fillet with or without a spine curve. The Distance Tolerance modeling preference lets you define the accuracy of the fillet. After you have selected both faces and the optional spine curve, you are prompted to define the following options: Create Fillet

Lets you create or not create a fillet by toggling between YES and NO. The default is set to YES.

Create Curve

Lets you create the offset intersection curve between the two faces. It has the contour of the fillet type you selected and the parameters you entered, and can be used as a spine curve for creating a more complicated fillet. This option toggles between YES and NO and defaults to NO.

You are next prompted to choose between Circular and Conic as the cross section type.

Detail Feature



55

Fillet Type

You are given these options for the fillet: Constant Creates a fillet with a fixed radius. Linear

Creates a linear fillet of variable radius. The change in radius of curvature is linear from the start to the end of the fillet.

Sshaped

Creates a variable radius fillet of an S-shaped curvature.

General Creates a variable radius fillet by specifying multiple points on the spine curve and functional values at each point. This option only appears if you selecte d a spine curve. The figure below shows examples of each fillet t ype.

Selecting Points

Detail Feature



56

For a constant radius fillet specif y a Start Point or simply choose OK. The system creates a start point for the fillet and traces edge to edge, unless the start and endpoints are specif ied. Except for a constant radius fillet, you are required to select at least a Start Point and an End Point that describes the beginning and ending position of the fillet. For a fillet a round a closed periodic face you may choose OK when prompted for the End Point. For a general fillet (using a spine curve) you may specify additional points. Note The Limit Face and Limit Plane options are alternative means for determining limit points for the offset intersection curve at the center of the fillet. The fillet is not trimmed to, or exactly limited by these objects. To get a trimmed version of the fillet, create a fillet that extends beyond these objects, then trim the fillet to these objects. Specifying Functional Values

Each cross section fillet type requires you enter different creation parameters. Circular - requires that you enter a radius for the point(s) you selected. Conic - requires that you enter a radius, ratio, and rho for the point(s) you selected. Ratio

The Ratio value is used to compute the radius (or offset value) for the second face. It is the ratio of the distances from the selected faces to the offset intersection point (see the figure below).

If the ratio value is less than 1, the larger offset value of the fillet sheet is from the first selected face. If the ratio value is greater than 1, the larger offset value of the fillet sheet is from the second selected face. If the ratio value is equal to 1, the offset values is equal.

Detail Feature



57

Rho

The Rho value determines the fullness of each conic section. It represents a fraction of the distance from the chord midpoint between the edge points to the apex, and can have a val ue ranging from 0.001 to 0.900. The Rho value determines the shape of the conic:   

Parabola: rho = 0.5 Ellipse: 0.0 < rho < 0.5 Hyperbola: 0.5 < rho < 1.0

The figure above shows how the conic shape is related to the value of Rho. A small value of Rho (0.001) produces a very flat conic, while a large rho value (0.900) produces a very "pointed" conic. For each fillet type, the Rho value's behavior is: Constant The value of rho is constant along the entire sheet. Linear

The values of rho are linearly tapered between starting and ending values corresponding to the start and end of the sheet.

Sshaped

The values of rho follow a s-shaped curve.

General The values of rho vary continuously between the specified values. If your fillet will have a conic cross section, the system prompts you for the Rho Function type:

Detail Feature



58

Same As Fillet The rho values are computed in the same way as the fillet type you are using, constant, Type linear, s-shaped or general. Least Tension The rho values are computed from the input geometry according to a least tension condition. In most cases this produces an elliptical cross section. Direction Vector

A direction vector is displayed at the first point. The direction of the vector can be changed and should point in the direction for the fillet from the first selected point to the last selected point. Tips and Techniques When No Suitable Spine Curve

If you do not have a suitable spine curve, you may create the offs et intersection curve by toggling Create Curve to yes and Create Fillet to no. This creates a curve that can be used as a spine curve. Non-Intersecting Faces

When creating a fillet between two faces that do not touch, the fillet radius must be large enough so that the edges of the fillet overlap both selected faces. If the fillet radius is not large enough and its edges do not overlap both selected faces, the system will not generate the fillet sheet, as shown in the figure below.

Note If the fillet just touches the edges of the selected faces but does not overlap them, you may get undesirable results. Trimmed Sheets

Filleting of trimmed sheet body faces may produce undesirable results. Small Radii

The fillet radius (including the second radius for a conic cross section) should not be smaller than the distance tolerance. If the radius is too small, the fillet may not be created.

Detail Feature



4.1.

59

Error Messages

The system may display the following error message if it is unable to find the offset intersection point (or edge curve points) for the specified pair of faces and/or the specified radius (and ratio and rho) values. Data Not Found Respecify Point Point Not Found - Respecify Functional Values or Faces

The system may display the following error message if the rat io is not equal to 1.0 and the sheets are convex relative to the offset intersection point. Fillet Gouging Faces Respecify Point Fillet Gouging Faces Functional Values

The following error message may occur if the system is not able to trace the curves (if the faces are not sufficiently smooth or under certain other unusual conditions). Unable To Complete Trace Creating Partial Fillet

The system may display the following error message if th e radius of curvature of one, or both, of the faces is too small compared to the radius (or radii) of the fillet sheet. Excessive Curvature In Face Creating Partial Fillet

5. Bridge Use the Bridge command to create a sheet body to connect two faces.

You can do the following:     

Specify either Tangent or Curvature Continuity between the bridge and the defining surfaces. Specify the Tangent Magnitude for each edge. Select the Flow Direction for the surface. Limit the surface edges to a percentage of the selected edges. Offset the defining edge onto the selected surface edges.

Where do I find it?

Detail Feature


[NX8-HELP] DETAIL FEATURE Application

Modeling

Toolbar

Feature →Detail Feature Drop-down →Bridge

Menu

Insert →Detail Feature→Bridge

5.1.

60

Create a bridge between two faces

This example shows how to create a bridge between two faces and create the required shape. 1. Choose Insert →Detail Feature→Bridge. 2. In the Edge group, highlight Select Edge 1, in the graphics window, select the first edge.

3. In the Edge group, highlight Select Edge 2, in the graphics window, select the second edge.

The surface is created and previewed in the graphics window.

Detail Feature



61

4. Select the Tangent Magnitude arrow to change the surface shape.

The surface is updated and the result is previewed in the graphics window.

5. Select the Edge arrow to change the surface size along the guide edges.

Detail Feature



62


6. Drag the Offset arrow to change the surface edge offset.


Detail Feature



5.2.

63

Bridge Surface dialog box

Constraints Continuity

Edge 1 or Edge 2

Detail Feature



G0 (Position)



G1 (Tangent)



G2 (Curvature)



64

Tangent Magnitude 

Tangent Magnitude=1.0



Tangent Magnitude=2.0



Not Specified

Edge 1 or Edge 2

Flow Direction Edge 1 and 2

Detail Feature



65



Isoparametric



Perpendicular



Start 0%End 100%

Edge Limit Edge 1 or Edge 2

Detail Feature



66



Start 25%End 75%



Offset=0%



Offset=50%

Offset

Edge 1 or Edge 2

Detail Feature



67

6. Spherical Corner Use this command to create a spherical corner from three walls. Each wall can consist of one or more connected faces. The walls do not have to come in contact with one another. The geometry is identical to that created in similar circumstances where an edge blend is created using the intersected edges of the input faces. The graphic shows a Spherical Surface feature that was created using three faces. You would need to use two Face Blend features to achieve a similar result.


Modeling

Toolbar

Feature →Detail Feature Drop-down →Spherical Corner

Menu

Insert →Detail Feature→Spherical Corner

Detail Feature



6.1.

68

Create a spherical corner

1. Choose Insert →Detail Feature→Spherical Corner.

In the Spherical Corner dialog box, the Wall 1 Faces

selection step active.

2. In the graphics window, select the first wall face and click the middle mouse button.

The Wall 2 Faces

selection step is active.

3. In the graphics window, select the second wall face and click the middle mouse button.

The Wall 3 Faces

Detail Feature

selection step is active.



69

4. In the graphics window, select the third wall.

Tip The direction vector should point towards the center of the spherical corner. 5. In the Radius box type 20. A preview of the spherical corner appears unless the radius is too large. 6. Click OK or Apply to create the spherical corner.

6.2. Spherical Corner dialog box Option

Description

Selection Steps

Let you select a set of wall faces. Wall 1 Faces

Wall faces can be a collection of contiguous faces. Note The radius must intersect the three walls.

Wall 2 Faces

Wall 3 Faces

Detail Feature


[NX8-HELP] DETAIL FEATURE Radius

70

Lets you enter a value for the radius of the sphere that is to define the spherical corner. If the Confirm Upon Apply check box is selected, changing the radius dynamically updates the resulting Spherical Corner feature.

Reverse Face Normal

Reverses the normal direction for the spherical corner.

Confirm Upon If this check box is selected the Confirm Upon Apply dialog box opens after you click Apply. You can preview the results, and then accept, reject, or analyze them. Apply

7. Chamfer overview Use the Chamfer command to bevel the edges of one or more bodies. Depending on the shape of the body, the chamfer bevels edges by subtracting material (1) or adding material (2).

You can define the cross section of the chamfer by specifying:   

One symmetric offset distance. Two offset distances. An offset distance and an angle.


Modeling

Toolbar

Feature →Chamfer

Menu

Insert →Detail Feature→Chamfer

Graphics window

Right-click an edge of a body→ Chamfer

7.1.

Create a chamfer with asymmetric offsets

This example shows how to create a chamfer with asymmetric offset distances.

Detail Feature



1. On the Feature toolbar, click Chamfer

71

or choose Insert →Detail Feature→Chamfer.

In the Chamfer dialog box, Select Edge (0) is active. 2. In the graphics window, select the edges to chamfer.

3. In the Offsets group, from the Cross Section list, select Asymmetric. 4. In the Distance 1 box, type the first offset distance value. For this example, a value of 15 is used. 5. In the Distance 2 box, type the second offset distance value. For this example, a value of 25 is used.

6. (Optional) If the offset distances are measured on the wrong side of the selected edges, click . Reverse Direction 7. Click OK or Apply to create the chamfer.

Detail Feature



7.2.

72

Chamfer dialog box

Edge

Lets you select one or more edges to chamfer. Select Edge

Note The software may approximate a simple chamfer when: 

The selected edges are not linear or circular.



The adjacent faces are not perpendicular.

Offsets

Specifies a method to input the offsets for the cross section of the chamfer. Symmetric

Creates a simple chamfer with the same offset distance on each side of the selected edges.

Cross Section

Note For more accurate results with complex chamfer cross sections, use the Offset Faces and Trim offset method. Asymmetric

Creates a chamfer with a different offset distance on each side of the selected edges.

Detail Feature



73

Note For more accurate results with complex chamfer cross sections, use the Offset Faces and Trim offset method. Offset and Angle

Creates a chamfer with a single offset distance and an angle.

Note This option is accurate only for simple geometry when the faces adjacent to the selected edges are planar, cylindrical, or conical. Available for Symmetric and Offset and Angle cross section types. Distance

Specifies a distance value for the offset. Available for the Asymmetric cross section type. Distance 1

Specifies a distance value for the first offset. Available for the Asymmetric cross section type. Distance 2

Specifies a distance value for the second offset. Available for the Offset and Angle cross section type. Angle

Specifies an angle value for the offset. Reverse Direction

Available for Asymmetric and Offset and Angle cross section types. Measures the offset distance or angle to the other side of the selected chamfer edge.

Settings

Available for Symmetric and Asymmetric cross section types. Specifies a method to define the edges of the new chamfer faces using the offset distance values. Offset Method

Offset Edges Along Faces

Produces accurate results for simple shapes only. Defines the edges of the new chamfer face by measuring the offset distance values along the faces adjacent to the selected edge.

Detail Feature



74

Offset Faces and Trim

May produce more accurate results for complex shapes when the faces adjacent to a selected edge have varying angles, are not planar, or are not perpendicular. Defines the edges of the new chamfer by offsetting the adjacent faces and projecting the intersection of the offset faces normal to the original faces. Adds the chamfer to all instances in the instance set. Tip

Chamfer All Instances





Instead of using this option, it is recommended that you create the chamfer and its parent feature first, add them to a group feature, and then create an instance set of the group feature. If you use this option, it is recommended that you add the chamfer to the master feature and not one of the instanced features. This is to make sure that the chamfer will always remain visible in the instance set if the array parameters are later changed.

See Group Feature and Instance for details.

8. Draft Use the Draft command to apply a draft to faces or bodies relative to a specified vector. You can do the following:  

Specify multiple draft angles and assign an angle to a set of faces. Add a single Draft feature to multiple bodies.

The Draft command is typically used to apply slope to faces for t he use in molded, or die cast parts, so that when the mold or die separates, the faces move away from each other rather than sliding next t o each other.

Detail Feature



75

Generally, the draw direction is the direction the mold or die must move to be separated from the part. However, if you are modeling a mold or die, it is the direction the part must move to be separated from the mold or die. Where do I find it? Application

Modeling, Shape Studio

Toolbar

Feature →Draft

Menu

Insert →Detail Feature→Draft

8.1.

Isocline and True Draft methods

Isocline method This is the default method for creating the drafted surface.

An isocline surface is the enclosed surface that is created by extending the envelope of opposing infinite cones. The cones have the following characteristics.

Half-angle of the cones equals the draft angle Centerline of the cones is parallel to the draw direction Apex of the cones follow either the stationary edge, or the section curves that are created from the stationary plane and the original faces to be drafted Stationary edge

True Draft method This method is useful when the faces to be drafted have edges that are nearly parallel to the draw direction or when the Isocline method cannot create the required dra ft.

Detail Feature



76

The True Draft surface is defined by a set of lines that have the following characteristics: 



The lines lie on planes that are normal to the surface to be drafted and parallel to the draw direction. These planes and lines are created at every point on the stationary edge. The lines pass through every point on the stationary edge at an angle equal to the draft angle plus 90 degrees. Plane through point on stationary edge, normal to the face to be drafted, and parallel to the draw direction. Stationary edge Line through point on stationary edge, and parallel to the draw direction. Line through point on stationary edge, on the plane, at an angle equal to the draft angle plus 90 degrees to the li ne that is parallel to the draw direction. Draft angle plus 90 degrees.

8.2.

Create a draft from a plane

1. On the Feature toolbar, click Draft , or choose Insert→Detail Feature→Draft. 2. In the Draft dialog box, from the Type list, select From Plane. 3. Click the middle mouse button to accept the default draw direction (+ZC).

Detail Feature



77

4. In the graphics window, select the planar face as the stationary plane.

5. Select the faces to draft.

6. In the Angle box, type a value. For this example, 10 is entered. 7. Click OK .

8.3.

Create a draft from an edge

This example uses the True Draft method to draft edges that are not contained in a plane normal to the draw direction. 1. Draft

Detail Feature



78

2. In the Draft dialog box, from the Type group, select From Edges. 3.

Define draw direction +ZC.

4.

Select the stationary edge.

5. In the Settings group, from the Draft Method list, select True Draft. 6.

Draft Angle = 20

8.4.

Create a draft tangent to faces

This example shows how to draft the selected faces while maintaining the tangency to the blend.

Detail Feature



79

1. Draft

2. In the Draft dialog box, from the Type group, select Tangent to Faces.

3.


4. On the Selection bar, set the Face Rule list to Single Face.

5.

Select tangent faces.

6.

Draft Angle = 5

8.5.

Create a draft to parting edges

This example shows how to create a draft at parting edges and create a ledge perpendicular to the reference direction and the edge.

Detail Feature



80

1. Draft

2. In the Draft dialog box, from the Type group, select To Parting Edges. 3.


4.

Define the stationary plane.

5.

Define the parting edges.

6.

Draft Angle = 10

Detail Feature



8.6.

81

Draft dialog box

Type

Type list

Specifies the method you want to use to create the draft.

From Plane

Lets you specify a stationary plane. The cross sect ion of the body at the stationary plane remains unchanged by the draft operation.

Draft around section defined by a datum plane

From Edges

Lets you specify a selected set of edges as stationary, and the faces that own these edges to be drafted at specified angles. This option is useful when the edges required to be stationary are not contained in a plane normal to the direction vector.

Draft from stationary edge

Tangent to Faces

Lets you apply draft while maintaining the tangency between the faces you select. This option is useful in molded or cast parts to compensate for possible die lock.

Detail Feature



82

Draft moves side faces to maintain tangency with the top

To Parting Edges

Lets you create drafted faces based on a selected set of parting edges, a specified angle and a stationary plane. The stationary plane determines the cross section that is maintained. This draft type creates ledge faces perpendicular to the reference direction and the edge.

Draft creates a ledge at parting edge, defined by a datum plane

Draw Direction

Lets you specify the draw direction. In general, the draw direction is the direction the mold or die moves to be separate from the part. NX infers the draw direction based on the input geometry. You can click the middle mouse button to accept the default, or specify a different direction. Type specific options From Plane

Stationary Plane



— Lets you specify or create a stationary plane that is Select Plane normal to the draw direction and passes through a specified point.

Faces to Draft

 

From Edges

— Lets you select the faces to draft. Select Face Angle — Specifies the draft angle for each set you define.

Stationary Edges



Detail Feature

Select Edge

— Lets you select stationary edges. drive24ward (meslab.org/mes)

[NX8-HELP] DETAIL FEATURE 

83

— Lets you reverse the side of the stationary face when the Reverse Side draft direction is reversed.

Variable Draft Points



 

— Lets you select points on stationary edges in order Specify Point to specify varying draft angles. You can enter different angles for each of the reference points you specify. Variable Angle — Specifies the variable draft angle for each set you define. Location — Specifies the location of the variable angle point along the target edge. You can specify either a percentage of the edge (% Arc Length ) or an explicit distance along the edge ( Arc Length ).

Settings 

Tangent to Faces

Tangent Faces



To Parting Edges

Draft Method list — Lets you set the draft method to Isocline or True Draft. For more information, see Isocline and True draft.

– Lets you select both the faces-to-draft and the faces they Select Face must remain tangent to after the draft operation.

Stationary Plane



— Lets you specify or create a stationary plane that is Select Plane normal to the draw direction and passes through a specified point.

Parting Edges





Detail Feature

Select Edge

— Lets you specify parting edges.

Reverse Side — Lets you reverse the side of the stationary face when the draft direction is reversed.



84

Settings Draft All Instances

Lets you choose to draft only the selected instance or all instances in the pattern.

Draft All Instances — not selected

Draft All Instances — selected

Lets you specify the maximum distance between the input geometry and the resulting body. Distance Tolerance The default value is taken from the Modeling Preferences. For more information, see Modeling Preferences — General. Lets you specify the angle tolerance. This toleranc e is used to ensure that the drafted surfaces Angle Tolerance are within the specified angle in relation to neighboring surfaces. The default value is taken from the Modeling Preferences. For more information, see Modeling Preferences — General.

9. Draft Body Use the Draft Body command to add and match drafts on both sides of a parting surface and to fill undercut regions with material. You can use this command when you develop models for castings and molded parts. The following example shows a double-sided taper on both sides of a datum plane used as a parting object. A double-sided taper makes a part easy to draw out of a mold.

Parting object Double-sided draft matched on both sides of the parting object Double-sided draft unmatched at parting object

You can match double-sided tapers created on both sides of the parting object. Matching may also be omitted to achieve minimum weight.

Detail Feature



85

The following example shows a single-sided taper used to fill the undercut region with material.

Note You can use the Draft command to get similar results, but you cannot match faces at the parting object when you use Draft. Where do I find it? Application

Modeling, Shape Studio

Toolbar

Feature →Draft Body

Menu

Insert →Detail Feature→Draft Body

9.1.

Create a double-sided draft

This example shows how to create a double-sided draft matched at the parting surface.

1. On the Feature toolbar, click Draft Body , or choose Insert →Detail Feature→Draft Body. 2. In the Draft Body dialog box, in the Type group, select From Edges from the list.

In the Parting Object group, Select Parting Object

is active.

3. Select the datum plane as the parting object. In the Draw Direction group, Specify Vector is active.

Detail Feature



86

4. Specify the direction in which the draft is to be drawn.

5. In the Stationary Edges group, from the Location list, select Above and Below . 6. Click Select Edges Above Parting above the parting object.

and in the graphics window, select the stationary edge

7. Click Select Edges Below Parting below the parting object.

and in the graphics window, select the stationary edge

Detail Feature



87

8. In the Draft Angle group, specify the draft angle. For this example, 10 was entered. 9. In the Match Faces at Parting Object group, from the Match Option list, select Match All. 10. Click OK or Apply to draft the body.

9.2.

Draft a body based on an extreme face point

This example shows how to draft a body and control the taper from a point on the face that is furthest from the parting object. The draft updates when you edit the model, so that a different face is furthest from the parting object.

1. On the Feature toolbar, click Draft Body , or choose Insert →Detail Feature→Draft Body. 2. In the Draft Body dialog box, from the Type list, select Faces to Draft .


is active.

3. Select the parting object. For this example, a datum plane is selected.

Detail Feature



88

4. Specify the draw direction.

5. Select the faces you want to draft. For this example the front face was selected.

6. In the Draft Angle group, specify the draft angle. For this example, specify a draft angle of 15 degrees. 7. In the Match Faces at Parting Object group, from the Match Option list, select None. 8. Select the Extreme Face Point Overrides Stationary check box to apply the draft from the parting object to a point on the face of the body that is furthest from the parting object. 9. Click OK . The draft is applied from the top face of the wide pad on the left.

Detail Feature



89

Original solid body. Draft applied from a point on the face of the bod y furthest from the parting object. Resulting drafted body. 10. Modify the height of the smaller pad on the right to make it taller than the pad on the left. The top face of the pad on the right is now the furthest from the parting object. When you modify the model, NX recreates the draft from the top face of the pad on the right.

Modified height of the smaller pad. Draft applied from a point on the face of the modified pad furthest from the parting object. Resulting drafted body.

9.3.

Draft a body by resizing selected faces

This example shows how to draft the selected faces of the solid above and below the parting object. The interior faces of the slot are resized to accommodate the drafts.

Detail Feature



90

1. On the Feature toolbar, click Draft Body , or choose Insert →Detail Feature→Draft Body. 2. In the Draft Body dialog box, in the Type group, set the list to Faces to Draft .


is active.

3. Specify the parting object. For this example the datum plane is selected.

4. Specify the draw direction.

5. Select the faces you want to draft. For this example the four side faces of the solid body are selected.

Detail Feature



91

6. Specify the draft angle. For this example, a draft angle of 15 degrees is specified. Though sufficient inputs are provided to create the draft, you cannot apply the draft at this point. You must resize the faces of the slot to accommodate the draft.

7. In the Faces to Move to Drafted Face group, click Select Face select the faces of the slot.

and in the graphics window

8. In the Settings group, from the Draft Method list, select Isocline. 9. Click OK to create the draft.

9.4.

Draft a body to remove an undercut

This example shows how to create a single-sided draft and fill the undercut region with material. 1. Draft Body

Detail Feature



92

2. In the Draft Body dialog box, from the Type list, select Faces to Draft.

3.

Specify the draw direction +ZC.

4.

Select faces to draft and specify draft angle = 2.

9.5.

Draft Body dialog box

Type

Specifies the method used to apply the draft.

From Edges

Type list

Lets you select the edges from which to taper.

Faces to Draft

Lets you select the faces to be tapered.

Detail Feature



93

Parting Object

Lets you specify a sheet body or a datum plane as the parting object. Select Parting Object

You can select only one parting object. If you select a datum plane, NX creates a temporary sheet body on the datum plane and uses it as the parting sheet body. Parting sheets can be planar or non-planar.

Draw Direction

Specifies the draw direction. The default draw direction is +ZC, or the direction normal to the datum plane specified as the parting object. Note If you are drafting a part or a pattern of a part, the draw direction is the direction that the mold or die must move to separate it from the part or pattern. If you are drafting the mold or die, then the draw direct ion is the direction that the part or pattern must move to separate it from the mold or die. Type Specific options Stationary Edges Location list

Specifies the method used to select stationary edges.

From Edges

Above and Below

Lets you select stationary edges both above and below the parting edge.

Above Parting Only

Lets you select stationary edges above the parting edge and in t he same direction as the draw vector.

Below Parting Only

Lets you select stationary edges below the parting edge and in the opposite direction as the draw vector.

Select Edges Above Parting /

Select Edges Below Parting

Lets you specify sets of stationary edges above and below the parting edge respectively. Edges to Move to Drafted Face

Specifies the edges that are allowed to move during the draft operation. The fixed position constraints for these objects are relaxed and free to move during draft creation.

Select Edge

Detail Feature

is available. drive24ward (meslab.org/mes)


94

Faces to Draft

Selects the faces that you want to draft.

Select Face Faces to Draft

is available.

Faces to Move to Drafted Face

Specifies the faces that are allowed to move during the draft operation. The fixed position constraints for these objects are free to move during draft creation.

Select Face

is available.

Draft Angle Angle

Specifies the angle of the taper that t hat you want to draw.

Match Faces at Parting Object

Adds material, if necessary, to opposing drafts at the parting sheet to ensure that they meet evenly.

Match Option

Match All

None

Match All but Selected

Available when Match Option is set to Match All or Match All but Selected . Automatically repairs sharp mitered edges on the drafted surface. None

Unmatched edges are not repaired. Repair Option

Repair with Blends

Smoothes sharp edges so that they appear to have been replaced with blends. Repair with Planes

Replaces sharp edges with a set of planes pla nes that are tangent to the faces. faces . Repair with Both

Detail Feature



95

Smoothes sharp edges using both the blend and plane methods.

Match edges without repair

Repair Radius

Match edges using the Repair with Blends option

Specifies the radius of the blend used to repair the concave corner. Available when the Match Option is set to None. Lets you specify that the draft must be applied fr om the parting object to a point on the face of the body that is furthest from the parting object. If you edit the body such that the furthest point on the face is at a different location, the draft is applied from the new point.

Extreme Face Point Override s Stationar y

The face furthest from the parting object in the original body. The draft is applied from a point on this face. The face furthest from the parting object in the edited body. The draft is applied from a point on this face. Parting object. Settings

Specifies the method used to create the draft. Draft Method

Isocline

Creates draft faces using an isocline surface which is created by extending the

Detail Feature



96

envelope of opposing infinite cones whose apex lie on the stationary edge. This is the default mode for creating all tapers. Draft faces created with this method generally use the exact specified draft angle. For more information, see Isocline method. True Draft

Creates the draft faces using a true draft surface which is defined by a set of infinite planes and lines are created at every point on the stationary edge. Draft faces created with this t his method may not use the exact specified draft angle. For more information, see True Draft method. Specifies a distance tolerance between the input geometry and the resulting body. Toleranc The default value is taken from the Modeling Preferences dialog box. For more information, e see Modeling Preferences — Preferences — General General..

M ục l ục Detail Feature................................................................... ........................................................................................................................................ ............................................................................................ ....................... 1 1.

2.

3.

........................................................................................................................................................ ....................... 1 Edge Blend ................................................................................................................................. 1.1.

................................................................................... ....................... 2 Create a circular edge blend with constant radius............................................................

1.2.

Create a conic edge blend ............................................................. ........................................................................................................................ ........................................................... 4

1.3.

.................................................................................................. ..................................... 5 Create an edge blend of variable radius .............................................................

1.4.

............................................................................................ 7 Add setback points to an edge blend blend corner ............................................................................................

1.5.

Stop an edge blend short of a corner ....................................................................................................... ....................................................................................................... 9

1.6.

............................................................................................................................11 11 Edge Blend dialog box ............................................................................................................................

1.7.

............................................................................................. ...................................22 22 Edge Blend Allowed Overflow Resolutions..........................................................

1.8.

Hierarchy for Allowed Overflow Resolutions in edge blends ................................................................. 22

................................................................................................................................. ........................................................................................... ..................... 24 Face Blend ........................................................... 2.1.

.......................................................................... .........25 25 Create a rolling ball face blend with a constant radius.................................................................

2.2.

......................................................................................................... ..............................................2 6 Create a swept section face blend ...........................................................

2.3.

Create a face blend with an asymmetrical conic cross section.............................................................. 28

2.4.

.............................................................................................. ...................................29 29 Create a face blend with a tangent curve ...........................................................

2.5.

.......................................................................................................................31 31 Create a three-face blend .......................................................................................................................

2.6.

......................................................................................... .....................33 33 Choose a face blend from multiple solutions ....................................................................

2.7.

............................................................................................................................ .........................................................34 34 Face Blend dialog box ...................................................................

2.8.

Rho and the shape of conic face blends .............................................................. ................................................................................................. ...................................46 46

.................................................................................................................................. ........................................................................................... ..................... 47 Soft Blend ............................................................

Detail Feature


Unigraphics NX8 - Detail Feature

Recommend Documents