GPL Zero-Backlash Robotic Planetary Gearboxes

The GPL Series is GAM's robotic planetary gearbox, engineered for near-zero backlash: ≤0.1 arcmin (6 arcsec). Its patented gear engagement system holds that backlash for the full service life of the gearbox, and its balanced planetary design runs vibration-free throughout the motion.

Backlash is the small amount of play between mating gear teeth that lets the output shaft lag or drift from the commanded position. In robotics and motion control, backlash shows up as positioning error, vibration, or overshoot, especially in applications that reverse direction frequently.

The GPL Series has backlash of ≤0.1 arcmin (6 arcsec), about 10x tighter than cycloidal gearboxes, which typically run around 1 arcmin of backlash.

No. The GPL's patented design compensates for wear, so backlash stays steady for the full service life of the gearbox and no adjustment is required. In other precision gearboxes, backlash typically increases with wear and needs periodic adjustment.

Applications where position must stay accurate during the motion, not just at the endpoints. One example is robotic welding of round parts on a rotating trunnion, where the weld can be made while the part is turning. It also suits articulated robot joints, where backlash and vibration compound across axes and show up at the end-of-arm tool.

Both are high-precision designs, but they differ in motion quality and service life. Cycloidal gearboxes can introduce cyclical vibration mid-motion, so they are most precise at the endpoints. The GPL's balanced planetary design runs vibration-free, keeping accuracy throughout the motion profile, and is rated for 20,000 operating hours vs. 6,000 for standard cycloidal gearboxes. Cycloidal designs have the advantage in impact loading.