hey there;
Here is a zip file...if it made it
I have cut many thds. on the C6 use the wizard in Mach3 Turn and enter the numbers. if you are using inserts(prefered)or a HSS tool make sure every thing is indicated straight. I prefer to "0" Z at the face of the Part and stay .015 away from sholders. Toutch X on the part O.D. enter dia in DRO on Manual Screen>3/8-16 .375 Major dia. "0" part DRO. Zero Z too!
Your Start X dia is .375
Your End X dia is .293
The rest is whatever your Part length is ect.
The Turn wizzard will do the rest.
I have always used 3wire method to measure the thds. and it has always been +/- .001-.003. Works good enough for what it is.
The Threads zip file saves much time. with the numbers. Bob