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Effective Calculation of Position Tolerances in Stacked Fastener Applications

This guide explores practical applications and calculation methods for determining position tolerances in stacked parts using floating or fixed fastener conditions. Key topics include distributing total available tolerances across features, projecting tolerance zones to avoid interference, and recognizing tolerance accumulation in simple assemblies. Learn how to effectively apply zero position tolerances at Maximum Material Condition (MMC) to enhance manufacturing flexibility, while utilizing paper gaging techniques to verify compliance with drawing specifications.

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Effective Calculation of Position Tolerances in Stacked Fastener Applications

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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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