3dcs aao, fast dimensional and tolerance analysis

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

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Questions?