The thread is a M5 x.8 . custom thread ...The thread lead starts at .080 diameter and then transitions to .150 minor diameter of the thread. The problem is the .08 transition to .150. I can send iges, we use Mastercam Any cnc lathe guys out there.
:confused:
thanks,

Does your machine have the ability to do G32 threading?

This threading cycle allows the taper, and lead, to vary anywhere along the thread.

heres a pdf of the thread. notice the start. disregard the cuts in the thread.
I am interested in the start of the thread. I do have a file wihout the cuts.

http://img211.imageshack.us/img211/8592/threadpix3ob6.th.png (http://img211.imageshack.us/my.php?image=threadpix3ob6.png)

I think that is simple if you have G32; I have never had any need to use it but I have seen pictures of threads that had a point similar to that and then a straight portion.

Yup, use G32, pullout & return in a subprogram, modifiy the start position.