I just wanted to clarify the infeed for threading on both sharp v threads and also UN threads. I think I understand for sharp v threads the depth of cut is equal to the pitch of the thread. So for a 2 1/4-8 sharp v thread with the compound set at 29 degrees the calcualtion is .125*cos 29=.1094"
For a UN thread the infeed is 7/8ths of the pitch or .875*.125/.875=.125 So the infeed at 29 degrees would be .125"
This seems logical since when cutting UN threads you are truncating the triangle by 7/8 ths. Therefore .125*7/8= .1094
The UN thread is 7/8ths of the sharp v thread.
Is this correct?
Thanks, Steve