Hope someone can answer this..

I have my router (Mach2) set to cut at 8000mm per min, no problem. Feedrate set by the NC code.

However, if I run a program at say 4000mm per minute and then increase the feedrate above 100% using the DRO's it then get jerky movements etc....

This only happens when increasing the Feedrate above 100% even though the actual feed rate is well below the maximum.

Any ideas.

cheers

Frans