Transcription of Calculating Locational Tolerances
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Calculating Locational TolerancesHoward Gibson CET2016 April 23 Contents1 Objective .. Copyright .. Change History ..12 Bolts .. Screws .. Positional Error ..33 Fastener Implied 90 Angles (Warning, Warning, Warning!) .. Only Two Fasteners .. Four Fastener Pattern .. Datum Dimensioning .. Pitch Circles .. A more elaborate pitch circle model .. 11i4 GD&T Positional Positional Tolerances Using the Bolt and Screw Models .. Positional Tolerances from First Principles .. from First Principles .. From First Principles .. Zero Positional Tolerances .. Calculations from ASME Appendix B .. 165 Example186 Closing Remarks19A Older GD&T Positional Tolerances with Zero Positional Error .. Positional Tolerances for Bolts with Zero Positional Error .. Tolerances for Screws with Zero Positional Error.. 21iiList of Figures1 Bolted Connection worst case.
features are located to within speci cation. What follows is a systematic procedure for determining locational tolerances for bolts, screws, pins, shafts, and features embedded on the parts. This document is intended as a guide for designers, drafters and drawing checkers.
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