modelaratrod

To control the spindle speed from the program you will need to get an expansion board for your 501a from either Flashcut or Torchmate depending who sold the box originally. If you just want to turn the spindle on and off and manually adjust the spindle speed then all you need is the relay interface. I believe that if you have more relays available you can do a number of fix speeds. I will need to play with my system to figure this out, it may require a custom post. I can walk you through this if post the what you have for a relay interface. What version of Flashcut or Torchmate sw are you using for machine control are you using?

John