Applications for Rack & Pinion Drives

Mechanically Preloaded, Zero-Backlash Axis Drive:

For axis drive applications requiring high accuracy positioning on CNC machine tools, a simple rack & pinion drive may not provide the accuracy needed due to the backlash between the rack & pinion. To remove this backlash, a preloaded rack & pinion drive system is needed.

This system effectively eliminates the backlash between the rack & pinion by using two pinions – one to drive the axis and one to preload the axis to eliminate the backlash.

Eliminating the system backlash preserves accurate axis positioning during the transition period between acceleration/steady state and deceleration, when the rack & pinion flank contact and load reverses direction. To insure no backlash develops, the preload torque must be set higher than the deceleration torque.

Mechanically preloaded systems achieve the preload by spring loading or torsionally winding one pinion against the other. One pinion is considered fixed and the other spring-loaded. These systems are typically driven by only one motor and do not require a special motor controller. The dual-pinion reducer requires two pinions/gearboxes and a torsion bar to preload the system.

Dual-Pinion Gearbox

Please follow this link for more information on various styles of Preloaded Rack & Pinion Drive Systems.

Other Applications:

To insure proper selection, please consult the factory. If you have any questions regarding the information provided here or require more information, please call us at (800) 713-6170 or e-mail us. Our Sales and Engineering departments are ready to help you with your specific power transmission needs.