hello using mach 3 with a maxnc everything works except how do you run the spindle i click on spindle button and i get too slow for pulley.using min. that says that to the right of the clear button below the reset button if I type in the spindle speed and hit the spindle button speed goes to zero anybody have a idea as to whats wrong thanks art

You need to set up your pulleys to reflect the speeds you are using.

Go to the pulleys on config. If you do not have pulleys, then set pulley 1 to cover the entire speed range of your motor - from 0 to x thousand RPM.

If you have a motor control system, then Mach will set the speed as accurately as it can - but if it is outside the limits for the pulley, it will only go to the maximum or minimum.