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CNC Retrofit » Rack and Pinion System » PRO Rack and Pinion Drive, NEMA 23
PRO Rack and Pinion Drive, NEMA 23
PRO Rack and Pinion Drive, NEMA 23
Our PRO Rack and Pinion Drives offer tighter interfaces and higher accuracy than our standard line, with the following features:
  • Ball bearing pivot interface.
  • Super-oilite bushing and matched precision ground spindle shaft.
  • High resolution 3:1 for NEMA 23 motors.
  • Unique EZ-tension mechanism for simple adjustment of gear to rack pre-loading.
Our most recent version features some significant improvements in usability over previous models.
  • Top-side belt tensioning cam. Belt tension can be adjusted without clamps, even while the unit is installed on a machine.
  • Universal mounting plate design allows users to upgrade from NEMA 23 to NEMA 34 by changing only pulleys, belts, and drive spindle.
  • Dual bearing pivot with eccentric locking collar for low backlash and easy adjustment of rack engagement in non-standard setups.
Package includes:
  • Rack and Pinion drive plate with universal mounting features for NEMA 23 or NEMA 34 motors.
  • Pre-assembled dual bearing pivot system with precision shoulder bolt (3/8-16 thread).
  • 1/4" or 3/8" bore motor pulley.
  • Super oilite bearing drive spindle, with 20 tooth gear and 60 tooth timing pulley and matched precision ground shaft.
  • 3mm pitch timing belt.
  • Belt tension cam mechanism.
  • Motor mounting screws and nuts (motor not included).
  • Pro-tension kit.
PRO Rack and Pinion Drive, NEMA 23
Product Notes:
  • Motor not included.
  • Pair this drive system with our 420 oz-in 2.8 mH NEMA 23 Stepper Motor, 3/8" Shaft for superior machine performance.
    (our 1/4" shaft NEMA 23 Stepper Motors are also available)
  • PRO R&P drives interface perfectly with our PRO Gear Rack, available in 39" or 52" sections that are conveniently spliceable for virtually unlimited travel, using 20 pitch, 20 degree pressure angle rack featuring a mounting flange for easier installation, greater stiffness, higher load capacity, and longer gear life.
  • MACH Settings for R&P:
    • The R&P system is based on a pinion with a 1" pitch circle. The total linear distance traveled per revolution of the pinion is thus 3.14159". With the 3:1 reduction, this means that the distance traveled per motor revolution is 3.14159 / 3, or 1.0472". If you have a stepper with 200 steps per revolution, this means you have 200 / 1.0472" = 190.9861 steps per inch, or 0.005236" per step. With 10x microstepping, you would have 1909.861 steps per inch, or 0.0005236" per step. For the optional 3/8" pulley, this number changes to 1736.237, as the motor pulley is slightly larger.
PRO Rack and Pinion Drive, NEMA 23

Configuration and Options:
Motor Pulley:
Current Reviews: 4
This product was added to our catalog on February 25, 2013.

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