Three series of zero backlash flexible beam couplings are available with inch and metric bores and outside diameters ranging from 3/8" (10mm) to 1 1/2" (38mm). Couplings in all three series are machined from a single piece of aluminum and feature multiple spiral cuts. The multiple cut design provides higher torque capabilities and greatly reduced wind-up when compared to a commodity type single beam coupling.

The flexible beam 2 coupling (P-series) and flexible beam 3 coupling(F-series) each have two sets of spiral slots, a feature that provides superior parallel misalignment capabilities compared to the single beam coupling. Angular misalignment, axial motion and any combination of all three types of misalignment are also easily accommodated by the beam coupling. Ruland clamp style flexible beam couplings have the additional benefit of dynamic balancing, due to the unique configuration of the socket head cap screws.

A flexible beam coupling should be used in an application in which misalignment exists between the two shafts being coupled. The flexible beam 3 coupling is ideal for light duty power transmission applications such as coupling a servo motor to a lead screw in a motion control system. This coupling features a larger body size and stronger beams to provide high torque capacity and very low windup, while not sacrificing misalignment capabilities. The demanding nature of reversing servo applications make the performance benefits delivered by the Flexible beam-3 vital to maintaining the accuracy, repeatability and reliability of the system.

The flexible beam 2 couplings are designed specifically for precision applications, especially those that use delicate components such as encoders and tachometers. The small bearings on these components make low radial forces essential to longevity and continued high performance. It is shorter than the flexible beam-3 coupling and conforms to industry standard lengths, fitting into confined spaces and allowing for easy retrofits in existing equipment. At the same time, the multiple cut pattern continues to provide excellent torque capabilities and low windup.

Learn more about how to choose a servo coupling for your particular application from a Ruland expert. Read "What to Look for in a Servo Coupling" written by William Hewitson, director of manufacturing.

Also, read about the advantages of the F-Series six beam coupling here.