 ATLANTADRIVE SYSTEMS |
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SPLIT-PINIONS:
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. The split-pinion shafts mount directly into our High-Torque (HT) & High-Performance (HP) Servo-Worm Reducers.
DUAL-PINION
ELECTRICAL PRELOAD: 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. Our Automatic Lubrication Systems are highly recommended for use with these drives, providing continuous grease lubrication to the rack & pinion tooth flanks to preserve the quality and lifetime of the gearing. These drives are perfect for precise positioning applications, such as traveling gantries and columns, milling machines, CNC routers and material feel axis drives. Two reducers/motors can also be used to eliminate the axis backlash by electrical preload.
Split-Pinions |
Electrical Preload |
Systems Overview |
Lubrication |
Application Sheet
The system precision, including the pitch error and backlash, can be found below:
* The rack and pinion backlash depends on the alignment of the rack to the linear guides.
There are
three levels of precision for the hardened & ground racks, with rack
pitch error ranging from 0.012 mm to 0.036 mm per meter length depending
on which rack is used. Follow this link for more information on
our
Precision Racks.
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. The split-pinion shafts mount directly into our Servo Reducers and are fixed in place by means of a compression coupling. This provides rigid support and tight integration of the split-pinion shaft into the reducer. The end result is a compact and ultra-precise positioning axis drive. These reducers have backlash levels down to one arc-minute and ratios from 4.75:1 to 52:1 (higher ratios available with planetary-worm reducers).
The maximum drive force that each system
can handle (with safety factor 1.0) is listed below; this should be
compared to the application peak force, which can be
calculated here
Please click on values for
* Force ratings do not include any safety factors. Drive forces vary depending on gearbox ratio selected.
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. Our new HighForce Planetary Drives, which can handle highly dynamic and heavy loads, are perfect for these applications. These reducers have backlash levels down to one arc-minute and ratios from 4:1 to 100:1.
The maximum drive force that each system
can handle (with safety factor 1.0) is listed below; this should be
compared to the application peak force, which can be
calculated here
For dimensions, please click on the
"Reducer Size"
* Force ratings do not include any safety factors. Drive forces vary depending on gearbox ratio selected.
High-Precision Hardened & Ground Rack & Pinion Drive Systems, utilizing our our precision Planetary and Servo-Worm Reducers, which have backlash levels down to one arc-minute, to rigidly support and drive a hardened & ground pinion. The rack used in these systems are our Hardened & Ground Racks.
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HighForce Precision
Planetary Rack & Pinion Drive Systems