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American Precision Industries (API) CMD-260 Bipolar Microstep Chopper Stepper Drive
   pictures at the bottom of the page

  • DIP switch settable step ratio from full step to 254 microsteps (that is 50,800 microsteps on a 200 step motor!)
  • DIP switch settable automatic idle current reduction for cool running
  • DIP switch settable 1/4-8 amps output in 1/4 amp increments. No external resistors needed
  • 24-80 VDC supply voltage.
  • bi-polar chopper type current limiting
  • Work with 4,6, or 8 lead stepper motors.
  • Optical isolated inputs and outputs for noise immunity.
  • Electronic mid range stabilization
  • Can hook directly to a PC parallel port, a Basic Stamp, PIC, or other microcontroller, or a 555 timer circuit.
  • 5.02" by 4.05" by .84" thick.
  • Rugged die cast case to protect the drive
  • Screw terminals plug into the drive for easy connections
  • Heatsink required (not included) if set to over 4 amps.
  • Made in the USA!
  • These microstep/step drivers run very smooth with standard stepper motors.
  • Factory new in the original packaging
  • Connect directly to your computer and drive them with low cost CNC software such as TurboCNC, EMC, CNC Pro, Master 5, DeskNC, DanCAD.


    • Download the specifications on these drives as an Adobe Acrobat file.
    CMD-260 Installation sheet
    CMD-260 Brochure
    CMD-260 Frequently Asked Questions
    Pictures of the inside of the drives and the amp settings
    Reviews of the drive by people that bought them
    These drives are serious industrial units with a built in microprocessor to control the microstepping. This model has very recently been replaced by a newer drive. The CMD-260 has been in production for many years and is a tried and proven rugged industrial grade solution. I have been told that the list price on these drives was $446.00 per drive! I got these drives from an inventory liquidator that was handling the inventory of a manufacturer which is going out of business. They used the drives in their current products and all the drives were inventory for the production line.

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    My Home CNC page with other items for sale