The Ultra-High Precision Rack & Pinion Drive System, part number 74.92.330, features a preloaded split-pinion design that consists of an output shaft, a helical split-pinion set, and a preload unit. The system is engineered to minimize backlash through an axial distance adjustment between the pinion halves, which is 1 mm for modules 2 to 4 and 2 mm for modules 5 to 8. This design allows for a defined preload torque to be established between the rack and the split pinion, enhancing positioning accuracy. The helical split-pinion shafts are manufactured with hardened and ground teeth, adhering to DIN 3962/63/67 tolerances, ensuring durability and precision. The maximum preload torque for this model is adjustable, with a maximum of 67 Nm, and can be fine-tuned using a preload adjusting wrench. The preload adjustment is performed in the assembled state with the rack, requiring accessibility to the preload unit at the front side of the pinion shaft. This product is suitable for applications that demand ultra-precise positioning and repeatability, making it a viable option for engineers seeking to eliminate backlash in their rack and pinion systems.
For rack & pinion applications requiring ultra-precise positioning and repeatability, the system backlash can be eliminated by using two pinions - one to drive the axis and one to "preload" the axis to remove the backlash. Positioning accuracy is maintained during acceleration and deceleration, as well as during changes in direction of travel. We have several different different solutions to achieve a zero-backlash drive system:
SPLIT-PINIONS:
The simplest zero-backlash drive system utilizes a split-pinion, which consists of two pinion halves and an axial spring pack. The pinions halves mesh with opposite tooth flanks on the same rack, eliminating the backlash.
One pinion half drives the axis while the second pinion half is "preloaded" to remove the backlash. The preload setting of the second pinion half is fully adjustable on the machine by turning the axial spring pack at the end of the pinion shaft.
DUAL-PINION ELECTRICAL PRELOAD:
Another method to remove the backlash at the rack & pinion is to use two motor/reducer assemblies with dual pinions operating on the same rack in a master/slave setup.
One pinion drives the axis (the "master") while the second pinion is "preloaded" to remove the backlash (the "slave"). The preload is created electronically with a special motor controller; these systems can also be set up to drive together during cycle times when backlash is not critical.
Dual-pinion gearboxes using only one motor are also possible, please consult the factory.
| ATLANTA Drive Systems, Inc. | |
|---|---|
| Product Category | Rack and Pinion Drives |
| Product Number | 74.92.330 |
| Product Name | Ultra-High Precision Rack & Pinion Drive Systems |
| Features | Ground Teeth |
