Thank you very much worked perfect. I ended up at .021 in the offset but it worked great. My only question would be the depth? .4149 seems kind of Shallow. I run my 1/4-18 NPT@ z-.522? Since the program is incremental could I drop the Z lower and just increase my D offset to compensate?
Yes, by all means , if you need more thrds. do exactly that. BTW, that came from a cd-rom I got from my Iscar rep. if you have one in your area he/she should be able to set you up with one. Its "geared" for there product line but, I've found it works well for others as well
One other thing, the cutting length of your tool would be the determining factor as to how deep you can thrd. mill. I have a prog. for a 1-11.5 NPT that cuts the hole with a .625 dia bull nose e.m. using virtual axis interpolation to put a chamfer on the tappered hole before thrd. milling it. Note speed and feed on the bull mill it has cut at least 350 holes and shows no signs of wear!
Wow that’s pretty impressive. What material are you cutting? We specialize in plastic so we never even cut a taper for an NPT thread on the mills. We just use the recommended size on a drill chart. But like I said that’s plastic. Now on a lathe it’s different we always turn or bore the correct taper.