FAQ - Torque Limiters, flexible Servo Couplings and Line Shafts

Select a rotary Coupling

Q) What is the correct way to select a rotary coupling?
A) There are literally thousands of designs for flexible motor couplings available, each offering different degrees of backlash, flex and vibration damping. Once the overall design and flexible portion of the coupling has been selected (e.g. spider or elastomer insert type for low backlash and high damping) it is best to begin by evaluating the level of torque required to drive the coupling. Most pt couplings on the market are sized according to torque rating, and the output of the motor, gear drive, etc which will drive them.

This is the basic information used to select a mechanical coupling size, and will also dictate the outside diameter of any given flexible element. After the published speed and misalignment ratings of the coupling have been verified as appropriate for the application, the bores in the shaft hub need to be specified. If the selected coupling is dimensionally appropriate for the power transmission system, it is likely the correct item for the job.

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