After the mill was turned off overnight, the next day the velocity setting for X axis was found to be 45 ipm rather than the long standing setting of 200 ipm. Changed the setting back to 200 ipm and it works OK.
I am running Mach3 version3.043.057 on a Dell Optiplex 745 computer with a XP operating system. Power management and screen saver are disabled.
Can anyone shed any light on the root cause?
Quin