3dcs aao, fast dimensional and tolerance analysis
Post on 21-Jan-2015
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Presenter: Brenda Quinlan, Senior Dimensional Analyst
3DCS Advanced Analyzer and Optimizer
Why AAO?
The Simulation results predict what problems an assembly will have.
The Sensitivity and GeoFactor results predict why those problems occur.
AAO recommends solution alternatives to those problems
What feature is your analysis most sensitive to?
Which tolerances contribute the most?
How can I reduce cost?
How do I know I’m getting the best value vs quality?
AAO
Analysis run. Now what?
Analyzers
Where Do You Start?
Advanced Analyzer Matrix
• Based on GeoFactor Analysis• Six Methods of Combining Contributors
Advanced Analyzer Matrix
Critical Tolerance Identifier
• Pp*: weighted by spec limits, no mean shift• Ppk*: weighted by spec limits and mean shift• Out%: weighted by out-of-spec results• Ave%: average % contribution per measurement
*Process Performance or Process Performance Index
Quantifies the effect of each tolerance (or hole-pin float) on the measures simultaneously and globally
Optimizers
How can you reduce cost?
How to know you’re getting the best quality vs cost?
Tolerance Cost Optimizer
Achieve desired quality at minimum cost
Goal Value (spec limits)
Max, Min, Lock, Cost
Optimized Measure Range
Opt Tolerance Range
Total Current Cost and Total Optimized (Minimum) Cost
Input
per Measure
per Tolerance
Optimizer
Output
*Assumption: larger tolerance = less cost
Smaller Tolerance = More Cost
(6tk)2
Costk
(6tkmin)2 (6tkmax)
2
Costkmin
Costkmax cck = (Costkmax - Costkmin) / [(6tkmax)
2 - (6tkmin)2]
Cheapest in-Spec Solution
Tolerance Quality Optimizer
Achieve best possible quality at a defined cost
Goal Value, Weight
Max, Min, Lock, Cost
Total Available Budget
Opt Meas
Opt Tol
Total Current Cost, Total Optimized (Minimum) Cost, Optimized Quality Value
Input
per Measure
per Tolerance
Optimizer
Output
*Assumption: Weight and Cost are relative values
Biggest Bang for Your Buck
Advanced Analyzer Matrix
• The GeoFactor Table is accessible from the matrix
Advanced Analyzer Matrix
GeoFactor Mean Shift Table
Ranks affect of Tolerance Offsets
Demo: Suspension Model
Dimensional Control Systems Inc.580 Kirts Blvd.Troy, Michigan48315USA
MAIN OFFICE: 248-269-9777WEB: WWW.3DCS.COMEMAIL: SALES@3DCS.COM
Questions?
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