Quote Originally Posted by Davo242 View Post
Wondering if anyone knows why my stepper motors keep stopping and starting when a program is running but in jog mode they run fine. Only new so Mach3 might not be set up ok.
Not giving us much to go on here Davo we are not Mystic Meg's.? Could be lots of things.

Explain better exactly what happens ie: Does it stop completely or stop/start. On which axis and at what point of travel on machine, same place or random spots. When or where in the code, beginning, middle end.? . . . . Video better still.

Give details of the Motor tuning in Mach3 for each axis.
Give Info regards drive model and Micro stepping, PSU voltage, motor size/model.
Parallel port or external motion control.

Give some indication to size and type of machine.