True Planetary Gearheads Planetary gearheads are used on high precision motion control applications which require a high torque to volume ratio, high torsional stiffness, and low backlash. Thomson has combined the positive attributes of gear crowning and helical gearing with planetary construction to create the smoothest operating gearhead on the market, the UltraTRUE™ True Planetary Gearheads. Thomson offers these precision planetary gearheads for all duty cycles, and all with RediMount compliant mounting systems. Select a Gearhead using any of the options given below and Request a Quote by filling in a simple form. Sizing And Selection   Download a Custom Solid Model Once you select your Gearhead, CAD models can be downloaded in a variety of formats.   Click on the button below to Continue    Need a Gearhead in 24 hours?           Select Gearhead by Model Number Click on the model to continue