Choosing Couplings for Misaligned Shafts

When shafts don't line up perfectly, a rigid coupling will fail fast. You need a flexible coupling that accommodates the misalignment without transferring excessive forces to bearings. The key is to match the coupling's allowable misalignment to your actual conditions.

Start by measuring the three types: angular, parallel, and axial. Then pick a coupling that handles the worst case with margin. For light torque and small misalignment, a jaw coupling works well. For heavier loads and larger misalignment, use a gear coupling or a disc coupling.

Don't oversize unless you must. Bigger couplings can be stiffer and may transmit more vibration. Check the manufacturer's ratings for speed and misalignment, and remember that combined misalignment reduces allowable values. When in doubt, call the supplier with your numbers.

Finally, install per the drawing. Even the best coupling fails if you skip lubrication or misalign it during assembly. Measure with a dial indicator before running.

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