GPL Zero-Backlash Robotic Planetary Gearboxes
GAM’s revolutionary 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 applications.
Benefits
- Backlash ≤ 0.1 arcmin (6 arcsec), 10x better than other precision gearboxes
- Best-in-the-market torsional rigidity for ≤ 0.6 arcmin lost motion
- Operates vibration-free for superior positional accuracy and continuous controlled throughout the motion
- No adjustment required:Patented design guarantees backlash will not increase over the life time of the gearbox
- Operating life of 20,000 hours
- Industry-accepted proven performance
- Integrated motor adapter ready to mount your motor
- Replaces direct drive motors at significant cost savings
- Exceed the performance of a cycloidal gearbox in almost every application
Reduced Lead Times
GAM now offers a 2-week lead time on select sizes and ratios of the GPL. Contact us today and request a quote!
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search our catalogUnique Gearing for Lifetime Precision
GPL Planetary vs. Cycloidal
The GPL robotic planetary gearbox provides superior performance compared to a cycloidal gearbox.
Feature | ![]() THE NEW STANDARD: GPL Planetary Gearbox | ![]() Cycloidal Gearbox |
Backlash | <0.1 arcmin for the life of the gearbox | <1 arcmin - backlash increases with wear |
Path Control | Balanced planetary gearing for smooth controlled path without vibration | Unbalanced gearing results in vibration during movement |
Service Life | 20,000 hours rated life | 6,000 hours rated life |
Torque | Rated torque at output speed (n2) of 15 rpm | Rated torque at slower output speed of 5 rpm |
Efficiency | >90% independent of speed | >85% |
Duty Cycle | S1 duty cycle (continuous operation) is possible. High input speeds up to 6600 rpm | Lower input speeds |
Prestage | Standard option | Not standard |
Shock Load | 3.3x nominal torque | 5x nominal torque |
GPL Robotic Planetary Models
GPL-F

- Flange output
- Sizes 056 to 400
- Ratios 50:1 to 200:1
- Nominal Torque 445 to 3500 Nm
GPL-H

- Hollow Flange output
- Sizes 057 to 400
- Ratios 35.5:1 to 131.1:1
- Nominal Torque 445 to 3500 Nm
Application Stories

Collaboration Increases Precision, Reduces Assembly Time
Cleveland Deburring Machine Company (CDMC) designs and manufactures equipment for many different methods of deburring. They needed a replacement gearbox for…
read more
GAM GPL Replaces Direct Drive Motor for Significant Cost Savings
A GAM customer had an application requiring multiple configurations, zero-backlash, and a shrink disc connection. Their current solution used multiple sizes…
read moreCollaborate with GAM
We have the ability to customize & modify all our products. Our team of engineers will collaborate with you to produce your desired result.
PDF Resources
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Learn MoreContact the GAM Team
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