sketch driven assemblies - sherpa-design.com · fnx mentoring ftct article: “accelerating design...
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Using Sketch Driven Assemblies for Design Automation & Re-Use
Patrick BarrettSherpa Design, Inc.Portland, OR
2www.sherpa-design.com
Sketch Driven Assemblies
Why use it? When?
Advantages
How to get started
NX Tools involved
WAVE, IPE’s, Cloning
Skeletons
How we’ve used it with some of our clients
Casting inspection fixtures
Nano / Semi tool
Vehicle structures
3www.sherpa-design.com
Who Am I? What’s a Sherpa?
Engineering Design Services: ‘get there’
Multi-CAD firm
Have the privilege of working with a lot of great companies
NX Mentoring
TCT Article: “Accelerating Design of Complex Products”
4www.sherpa-design.com
Why Do It?
Sketches are visual: easy to see what you’re doing/changing
Capture ‘Tribal Knowledge’
Standardize
Build in Flexibility
Save Time
Even 20% faster is still faster
1 day per week, 1-2 months a year…
Go kayaking
5www.sherpa-design.com
When To Use This Approach
Designs that are changing WRTSize
Position
Configuration
Assemblies that will probably have a long, evolutionary development cycle
Déjà Vu Design (2 or more: automate it!)
Not every design is a good candidate for thisWhere’s the ROI?
Focus on the PROCESS
6www.sherpa-design.com
Make a Model Plan
“Most people don’t plan to fail; they fail to plan”
Model Plans
Identify Key Drivers of the design/assembly
Layout the sketch, expressions, etc. on paper first
Allow you to troubleshoot (easier) your fundamental assumptions when you encounter road blocks
After you have the design programmed on paper, you CAD faster
Example Model Plan
7www.sherpa-design.com
NX Tools Used
Sketcher
WAVE Geometry Linker
IPE’s
Cloning (for re-use)
‘Skeletons’
Geometry that serves to constrain or locate assembly components (or features in linked parts)
Basic NX Applications
8www.sherpa-design.com
Skeletons
Can be whatever geometry makes the most sense to drive your assembly
Assy Solids, Curves, Datums, C-Sys, etc
Lighter the better
Can be inside Master part or it’s own component
Consider how these play with
BOM & Drafting
Teamcenter & your part number system
Cloning
9www.sherpa-design.com
WAVE Geometry Linker
Wave is powerful: use it sparingly*
Updates can take some time on large assemblies
Link the whole Sketch vs. Individual Curves
Smaller feature tree
Can add/delete from the sketch and not have to re-parent anything
*If you do a lot of WAVE consider the full-blown package. Easier to find/troubleshoot
broken links
10www.sherpa-design.com
IPE’s
Share important expressions between parts
Have a plan to where you want the user to update the expressions (Skeleton, TLA, etc). Keep it simple and consistent.
Basic construct: “part_file” :: expression
(Cloning maintains the link, Save-As will point to original
part)
11www.sherpa-design.com
Cloning
The “Intelligent Save-As” for Assemblies
Allows you to Create/Edit Assemblies
Works on file saved on disk, not open session
Maintains inter-part relationships
Re-names Linked Expressions
Maintains relationships between assemblies and their components
Part Number
Scheme is important
12www.sherpa-design.com
Internal Training/Documentation Is Key
Test your process and try to break the model
If someone can’t easily figure it out they will break it or make their own. Period.
Develop internal SME’s
Review the process and evaluate how well this is capturing the design intent. (Things change)
Take big automation tasks in phasesDon’t try to do it all at once
Don’t wait until the post-mortem to do a retrospectiveFind and fix problems as you go
13www.sherpa-design.com
SDA’s In Action
Inspection Fixture for Investment Castings
70% of the assembly design is done in a few hours
Consistent things changing from part to part
Started this 8 years ago (still paying for itself)
14www.sherpa-design.com
SDA’s In Action, 2
Turret Assembly Development
Lot’s of pieces that shifted around during development
Flexible layout
Tried multiple arrangements to get optimized design
Rules pertaining to interpart locations
15www.sherpa-design.com
SDA’s For Fast Conceptual Layouts
Program Manager/Lead could generate skeleton layout model
Add PMI, key notes, etc. to the model
Hand-off to design engineers for detailed design and component placements
Review what had to change to make it work
16www.sherpa-design.com
SDA’s In Action, 3
Vehicle Chassis Structure Tool
‘Standards’ that dictate position of members and sub-components
Vary with overall chassis length & wheel base
Many prismatic components
Get the bulk of this automated and leave room for design/customs
17www.sherpa-design.com
Chassis Sketch Layout
Using established standards.
Experimented with a Part Family at first
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The Rear View Mirror
Select candidates based on anticipated ROIDoesn’t make sense for all projects
Make a Model Plan
Design on Paper Program It
Evaluate/Break It Improve It
Document it
Share it and train people
Benchmark your improvement
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