M67 - Issue

Hi all,

We have a plasma cutter running QtPlasmaC which behaves somewhat strange. I have attached a video of the plasma cutter doing a contour without the torch turned on. The G-code contains M67 code to reduce the feedrate in the fillets and 100% feedrate on the straight lines. Except, the machine doesn't do that, it is "stuck" on 60% feedrate but suddenly, on the last leg of the contour is runs at 100% feedrate (as it should).

This problem arises randomly on other parts, sometimes it runs at 60% feedrate for half of a long straight line and then all of a sudden it jumps to 100% feedrate, which causes all kinds of issues. But strangely the vast majority of programs do not see this problem.

Has anybody experienced this and is there a solution for it ? Any help is greatly appreciated, it has got us stumped.

Cheers, Peter

It's a goer, thank you all !

Cheers, Peter