I have cnc router with G540 and cncrp gear rack, cncrp stepper motor 425 oz in (10 mm shaft). I cut hard wood and found that my stepper motor got very hot. I just want to know how hot is allowable before motor breakdown. Or it is normal that motor got very hot. On z axis, the motor is not too hot (warm). During cutting, the motor got hot, but it looks normal, no slower down speed or faster. I have tuned speed 300 ipm on xy and 200 ipm on z.