Uhing Model RG rolling ring drives simplify set-up and operation by eliminating the need for complex controls and programming. Linear speed and travel direction are mechanically controlled independently of the drive motor. Example applications: winding machines, spray & coating equipment, scanning devices, other applications requiring repetitive "back-and-forth" linear motion.

RG rolling ring drives convert the rotary motion of a threadless shaft into backlash-free linear output. The absence of threads means there is no clogging or jamming. If the system is somehow overloaded, the shaft simply slips instead of churning and grinding. (See How it Works)

Special machining and compression of the rolling ring bearing assembly prevent backlash, and make it unnecessary to design-in, or purchase, extra anti-backlash solutions such as preloaded nuts, shims or double enveloping gears. There is never any "play" between shaft and bearing. Rotary motion input from the shaft is therefore immediately converted into linear output with no backlash – including during reversal of the system.

A free movement lever (F-lever) is optional on rolling ring drives making it possible to slide the drive with its attached load, anywhere along the shaft without having to turn on the motor. The F-lever reduces wear and tear on the system by eliminating the need to "jog" the motor on and off to maneuver the drive into place.

Amacoil/Uhing RG drives are available separately or on the shaft in a custom assembly. The drives come in a wide range of sizes for varying linear speeds and axial thrust requirements.

RG Drive in Production Assembly

Rate of linear movement

Each size Uhing Model RG linear drive has a different maximum linear pitch – the linear distance the drive travels per one shaft revolution. The higher the motor RPMs, the faster the drive will travel its maximum linear pitch.

The pitch dial on the Model RG drive enables a 10:1 turndown on linear pitch. This is accomplished without changing gears or adjusting motor speed.

For example, the Model RG3-15-2 has a maximum linear pitch of 11.4 mm. With the pitch dial set at number 10, the drive will travel 11.4 mm with each shaft revolution. By turning the pitch dial to number 1, users reduce the travel distance (and therefore linear speed) per shaft revolution to 1.14 mm – regardless of motor speed.

The following chart lists Uhing drives with their respective maximum linear pitch ratings.

NOTE: When using a Model RG rolling ring drive, if the linear speed exceeds .25 M/sec (meters per second), special modifications are needed to the reversal mechanism. Please contact Amacoil for information: 1-800-252-2645.

For positioning linear motion applications
Model RS drive
Example applications: material handling machines, test and measurement devices, x-y table movement.