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Title: Verifying The Variation In Threaded Setting Plug Pitch Diameter Transfer To Contact Mated Internal Thread By Measurement And Calculation, Including Functional Size Analysis
Author: Arthur G. Strang
Source: 1998 Measurement Science Conference
Year Published: 1998
Abstract: Transfer of groove diameter from external thread mated to an internal thread exceeds industrial claims. The simple Jeffcott C correction accompanying the thread wire calibration is only reliable for X and W tolerance for lead and flank angle on threads. Present procedures for measuring groove diameter, calculating pitch diameter and functional size need clarification. A method for determining the true pitch diameter of a mated internal thread (assembly size) is introduced and may be a reliable method to asses the accuracy of measured screw thread characteristics.

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