Hi Phil,You're using insert tooling...assume the geometry on the insert to be correct. The "flat" on your cutter shank should be horizontal, insert will be tipped downward.A shot in the dark here, but some lathes (like the Smithy I learned on) are not at the "30degrees" you NEED when set AT 30degrees. With some lathes, you need to set @ 60 degrees. Having this wrong, produces a mess similar to what you describe, and THIS was the "hump" that I struggled with learning to single point. If you look at it from the top, does the compound actually appear to be on the correct angle to follow the desired thread profile?Aside...good to see you still kicking around. Regards,Al
Yay! I did it. Finally!