Our plasma table (Burny 1250 controller) consistently cuts inside diameters undersized, as if it doesn't account for the kerf properly. The outside dimensions are fine. I have been trying to come up with a rule of thumb like "increase the ID by 25% of the material thickness when using the 70A tip", to compensate but this seems a bit ridiculous...

Is this the nature of the beast? Should I scrutinize the Burny 1250 or our G-code generator (Turbonest)? I tend to think the Burny because even the pre-programmed shape library built into the Burny yields undersized ID's...

Any thoughts or comments are surely appreciated.
Thanks,
Mike

Have you spoken with the tech's at Burny? They are very helpful.
There also are some machine codes that affect this....I'm not sure of the number but I think they are called "kerf left" and "kerf right"....if one is deactivated it could cause this issue.

Jim Colt