Hi All, My machine ignores the Feed command on the y and a axis when they are locked using the formulas tab to enable me to do 2 axis cutting on my 4 axis setup. I had some kind help from learned friends and they found that it doesn,t matter what is linked to a the problem occurs. It seems like the a axis throws the speed out and mach compensates automatically to reduce the difference. They found a workable solution by re assigning the axis on the a side, unfortunately this is not workable in my instance, can anybody help us please it is an older version of Mach and I prefer using it for its build in cam software that I know and understand!!