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Need Some Help With Thread Dimensions


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Posted (edited)

We have a request for some custom threads, 1.438 - 80, roughly 1 7/16 - 80.  I've used three different methods to calculate the pitch diameter and I'm coming up with a .009" spread.  
Any machinists out there who can crunch those numbers?

 

Also, I found that for the 3-Wire method for measuring PD the best size wires are .00722 (use 3 .007+ gauge pins) and the constant is 0.01083.  Sound right?

Edited by Subdeacon Joe
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