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Practical Applications and Calculation Methods

12. Practical Applications and Calculation Methods. Calculate position tolerances when more than two parts are stacked in a floating fastener or fixed fastener application. Distribute the total available position tolerance between features to which position tolerances are applied.

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Practical Applications and Calculation Methods

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  1. 12 Practical Applications and Calculation Methods

  2. Calculate position tolerances when more than two parts are stacked in a floating fastener or fixed fastener application. • Distribute the total available position tolerance between features to which position tolerances are applied. • Specify projected tolerance zones for fixed feature locations to prevent interference conditions. • Determine the amount of tolerance accumulation in a simple assembly.

  3. Properly use zero position tolerances at MMC to increase manufacturing freedom. • Apply paper gaging techniques to determine if a produced part meets drawing requirements.

  4. Floating Fastener Condition—Two Stacked Parts

  5. Floating Fastener Condition—Three Stacked Parts

  6. Floating Fastener Condition— Two Hole Sizes & Distributed Tolerances

  7. Fixed Fastener Condition—Two Stacked Parts

  8. Fixed Fastener Condition—Two Parts, Unevenly Distributed Tolerances

  9. Fixed Fastener Condition—Projected Tolerance Zone

  10. Zero Position Tolerance at MMC • Zero tolerancing at MMC increases manufacturing freedom • Clearance conditions must exist • Located feature must have a size tolerance • Lets the manufacturer choose how to allocate the tolerances

  11. Zero Position Tolerance at MMC Application

  12. Paper Gaging Techniques • Measure hole locations relative to datum reference frame • Calculate coordinate variations • Calculate diameter position variations • Plot coordinate variation values

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