Drive gear coming loose on motor shaft
Drive gear coming loose on motor shaft
(OP)
Recently I've been called to repair several chiropractic massage tables. They all have the same problem. The chain drive gear becomes loose on the motor shaft and slides foward. There are two set screws and the shaft is keyed but it does not have any flat spots. Tightening the set screws is only a temporary fix, the gear works loose after a few days. Would grinding flats on the shaft help keep these gears in place. Also the manufactuer has positioned one of the set srews directly over the key. Is that proper?





RE: Drive gear coming loose on motor shaft
If you can arrange it so that the gear does not ever have to move again, there are a number of adhesives used in the plumbing industry that will probably glue it in place for ever. Or, if the gear does need to move, but only to discrete locations, you could try drilling and cotter pins.
EMc
RE: Drive gear coming loose on motor shaft
in the shaft for one of the set screws. Ideally, the
second setscrew should be 120 degrees from the one over
the keyway. I think I would try installing them with a
Loctite product on the threads.
RE: Drive gear coming loose on motor shaft
Drilling the spot for the grubscrews is a good idea, but I'd use Loctite to hold both the shaft, and the screws. Loctite is available in a whole range of adhesive qualities - 600 grade is as good as welding, 200 grade is dismantleable.
Cheers
Greg Locock
RE: Drive gear coming loose on motor shaft
RE: Drive gear coming loose on motor shaft