Arc has impossible geomety- error code

[Rick4004]

I am running Mastercam V9, and occasionally I get an error message when doing a dry lock verification of "Arc has impossible geometry - radius is too short".

Usually I find the offending line of code and do the calculations manually and fix the code by hand. Today, this particular file has a dozen or so errors, too many to track down manually.

Is there a tolerance setting somewhere in Mastercam to eliminate the rounding off error?

Thanks

Rick (not a Mastercam expert)

[g-codeguy]

Yes. But not being a MasterCam expert either, I can't give you the exact line. Not doing much milling, I haven't had that alarm, but have had small arcs that the post wouldn't output in lathe post processors. Try "ltol", "mtol", or "vtol" first. I think "mtol" may have been the one that removed a .0001 taper on straight lines. Or it may have been the one that allowed the system to output an odd tenth diameter. These are my settings in the one post processor I looked at. ltol=.0002, mtol=.00001, vtol=.0001

As always, make one change at a time, and then see if it worked. Hope one of these works for you.