hi i need a bit of help i have a cheap 3 axis controller off ebay and i have nema23 motors. they work ok driving them up and down the bed of the plasma machine but as soon as they try to cut an arc or circle they stall. what sort of setting in mach3 do i neex for the motors and control pins.
It sounds like you need to go into config/motor tuning and lower the accelleration and velocity of the axes that are giving troubles. Run each axis with the up/down keys, changing settings until it seems to be running fast and smoothly, then derate those settings about 25% to give yourself a margin for error. Remember to "save axis settings" before going on the next one, or it will revert to what it was set to previously.