Model Based Definition – A Method of Drawing-less Manufacturing
John Nolin John Nolin, CSWP CSWP-MBD Technical Representative Technical Representative SolidXperts SolidXperts
Model Based Enterprise: the techniques are already in use
What is MBD/MBE?
Are (separate) detail drawings worth the effort? “ 1/3
of engineering dollars are spent in 2D drawings. Yet 60% of them
don’t match 3D models.”
- Office of the U.S. Secretary of Defense (OSD)
Why now? - The relevant standards have been updated to allow MBD for contract deliverable documentation.
Cost Saving
Time Saving
Quality Improvement
Standard Compliance
Reduce scrap and rework
Faster response by suppliers
Remove model to drawing discrepancy
MIL-STD-31000A
Cut procurement cost
Save the time to create and maintain 2D drawings
Communicate more intuitively and accurately
ASME Y14.41 and Y14.5
Resources •
http://quicksearch.dla.mil/ •
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http://www.nist.gov/el/msid/infotest/mbe-pmi-validation.cfm •
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NIST samples and other resources for Model Based Enterprise
http://model-based-enterprise.org/index.html •
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Free PDF copy of MIL-STD-31000A and many other standards
Resources, advice, and more
https://www.asme.org/products/codes-standards/y1441-2012digital-product-definition-data •
To purchase ASME Y14.41
MBD levels as defined in MIL-STD-31000A •
Minimal – Conceptual •
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For flat products CNC cut by laser, plasma, or water jet and 3D printed parts or similar prototypes Overall envelope dimensions, a general `block’ tolerance, material &
overall surface finish •
Partial – Developmental •
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Designs with secondary operations, or models used for primary operations Minimal + any non standard tolerance dimensions, critical notes for manufacture
Full – Production •
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Parts made by outside fabricators, pieces & assemblies to be delivered to customer end users Partial + full dimensions, full notes, auxiliary views
Requirements Summary •
MIL-STD-31000A, 26 February 2013 •
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ASME Y14.41-2012 •
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Dimension tolerances of all types, GTOLS, notes, tables
PMI organization & customization within 3D file •
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Mandatory Appendix (page 97)
Thorough PMI Definition within 3D geometry file •
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Appendix B (page 35)
View toggling, annotation hide & show, dynamic highlighting
CAD independent – free 3D viewer output option •
Do not require reviewers to use originating CAD software
The desired output options:
MBD CAD File
3D PDF, eDrawing, JT2Go
SOLIDWORKS MBD •
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Added cost function set with its own serial number. Does NOT appear in the Add-Ins.. list, as there is not a specific *.dll turning on or off. Appears with its own toolbar, template editor, and publishing function. Creators need the MBD license – receivers can view results (similar to eDrawings Pro)
Samples
Template editor – mini app
Implementation Tips •
Have strong documentation practices in place • •
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Current eDrawings and Adobe Reader for everyone Be comfortable with DimXpert and GD&T • •
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Review the tutorials for both ASME refresher class for GD&T
Practice with the NIST samples and 12 or more of your own models • • •
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Model file (becomes) master document (period). PDM may be warranted
Try each of the Auto Dimension Schemes Validate what else you want in your output Save new BOM, Table, and Title Block templates for MBD use
Have buy in from management •
Also key vendors and/or customers
Pro User Tips •
CAD geometry files (*.stp, *.sldprt, *.x_t) can be attached within the 3D PDF • •
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3D Comments can be attached to model geometry while within the 3D PDF •
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Near the bottom of the drop list for the left most toolbar button
Shop floor displays can now be as simple as a $350 Android 12in tablet •
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In Adobe Reader – Comment Attach File (icon) & browse for file To remove – click Attachment icon in Tools Pane [Shift][F4]
eDrawings viewer app and Adobe Reader are available for Android 4.0 or greater A complete system with Dell mini desktop, touch screen monitor, stand and bar code reader can be put together for $1250
CSWP-MBD exam and certification is available •
It is a good way to prepare for a possible implementation
No more of these…
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