How to calculate pitch diameter of external threads
How to calculate pitch diameter of external threads
(OP)
How do you calculate the minimum pitch diameter for external screw threads as listed in the machinists handbook table 3 in the threading section.





RE: How to calculate pitch diameter of external threads
Pitch dia.(max;min)=(1/2)( major dia.(max;min)-minor dia.(min;max). I just derived this last equation but you may want to carry it out with real numbers and see how it compares w/ your Machinist's Handbook. a
RE: How to calculate pitch diameter of external threads
RE: How to calculate pitch diameter of external threads
Perhaps the Unified threads use similar formulas. I would suggest trying to get hold of a copy of the ANSI standard.
RE: How to calculate pitch diameter of external threads
Cobb
Scott Cobb
CSM Manufacturing, Inc
csm-mfg.com