Now featuring optional 22 tooth motor pulleys for Nema 23 motors with 3/8" shafts, and 3/8" pivots for Joe's users for easy conversions.
Introducing our newest drive system, perfect for larger format machines, 4' x 8', 5' x 10' and larger! Our innovative rack and pinion drive system is designed to mount directly to one of our Extended Linear Carriages
riding on a horizontal cold rolled steel rail (must overhang 1530 or 3030 extrusion by 1/2"). Mount a 20 Degree Pressure Angle, 20 pitch rack to the extrusion underneath the rail using our innovative rack clamps
-- combine lengths of rack to get the travel you want. Rack clamps are sold separately.
Then just tap two of the existing carriage holes for a 3/8-16 bolt (or choose the "tapped hole option" for the carriages if you're uncomfortable doing this, and we can do it for you for a small fee). One hole serves as the pivot for the drive system, and the other as a connection point for a tension spring. Connect your drive, and get ready to rock!
The system provides a 3:1 belt reduction (2.73:1 with 22 tooth pulley), putting NEMA 23 stepper motors in an optimal range for speed and power. Watch the videos of the system in action below!
This product includes the following components:
- Motor mount pivot plate
- 10-32 cap screws and hex nuts for motor mounting
- Pivot shoulder bolt, with precision shim
- Drive spindle assembly with pinion gear, integral bushing and timing belt pulley
- Timing belt pulley with 1/4 inch bore for NEMA 23 motors (optional 3/8 inch bore pulley available)
- Timing belt
- Tension spring
- Turnbuckle for easy tension adjustment
Note, the extended linear carriage shown in the video below is not
included, and must be purchased separately
For a quick video tutorial on how this system goes together, check out our Rack and Pinion Assembly Instructions
CAD files (with NEMA 23 motor)
MACH Settings for R&P
Our R&P drives interface with 20 pitch, 20 degree pressure angle gear rack, which we offer in convenient spliceable sections:
Simply mount rack to the extrusion underneath the rail using our innovative rack clamps
and combine lengths of rack to get the travel you desire.
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 (like in the G540), 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.