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Protohawk
in reply to: danpayneuk

I am now having the opposite issue as the OP, where it is cutting small instead of cutting big.  I have a 0.495" diameter 20 tooth thread mill for cutting a 3/4"x16tpi thread.  I had it so that the pitch (0.0625") times the teeth matched the flute length since that is how the tool physically is, so I changed the tooth number to 19 to get a mismatch, but the code hasn't changed when post processed.  My model is set to a minor diameter of 0.689" and I've got a pitch diameter offset of 0.0654" (I'm accounting for the flat on the thread form) but it is *barely* taking a scratch cut on the very last pass.

 

Simulation shows it working perfectly.