GAM GPL Zero-Backlash Robotic Gearboxes: The New Standard in High Precision GearboxesGPL Planetary Gearbox

GAM’s GPL Series Robotic Planetary Gearbox combines the lowest backlash and high tilting rigidity with vibration-free motion for smooth, controlled motion in robotics and motion control .


  • Backlash ≤ 0.1 arcmin (6 arcsec), 10x better than other precision gearboxes
  • Best-in-the-market torsional rigidity for ≤ 0.6 arcmin lost motion
  • Patented design guarantees backlash will not increase over the life time of the gearbox
  • Industry-accepted proven performance
  • Seven sizes with nominal output torque of 445 to 3505 Nm and ratios of 50:1 to 200:1
  • Flanged solid shaft output (GPL-F) or flanged hollow shaft output (GPL-H) (up to 75 mm through hole)
  • Integrated Motor Adapter Plate ready to mount your motor
  • Right angle GPR available
  • Replaces direct drive motors at significant cost savings
Want to know more about backlash, lost motion and other gearbox accuracy terms? Download GAM Gearbox Accuracy Definitions (pdf)

download GPL Brochuredownload GPL Catalog

download GPL CatalogDownload the Robotic Gearbox Application Datasheet

Gearbox Construction

The GPL Series has three stages:

  1. Helical pinion and gear: high ratios and quiet operation
  2. Planetary spur: fixed ratio
  3. Conical spur: lifetime zero backlash

Features & Benefits

Features Benefits
Zero Backlash ≤ 0.1 arcmin
Does not increase over the life of the GPL
Highest precision for your application
Lowest lost motion ≤ 0.6 arcmin Superior accuracy even with low torque
Design lifetime 20,000 operating hours Extends application life, reduces maintenance costs
High tilting and torsional stiffness Better point-to-point accuracy
Lowest level of vibration Superior control for continuous motion applications
Lowest breakaway torque Better controllability, especially over short distances
Highest efficiency at all speeds > 90% Faster cycle times & lower temperature
Lowest noise < 65 dB Can operate in close proximity to operators
Lowest operating temperature Longer-life components and S1 duty possible
Output side completely sealed Easier installation, no additional sealing required