I've just recently started programming on a HAAS ST-20 Lathe. I would like to know exactly how tool comp works on this if anyone could help that would be amazing.

When I setup my program with G41 enabled what does it do? I know it's to compensate for the tool facing left that's about all I know. When I write a program...lets say the diameter is .500 and I want to rough to .4295 when G41 is active it ends up cutting way more then it was programmed to I believe it came to .309. Now...I have the radius of the tools setup in my offsets and have everything touched off. When I run the same program with G40 enabled everything comes out how it was programmed.

So what am I missing? The person who runs another lathe (Okuma) says I should make all my programs with tool comp on but every time I do nothing comes out correctly. Does anyone have any advice or insight to my G41 problems?


Thanks in advance.