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Electric motor reassembly

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Maurice15/06/2018 16:52:45
434 forum posts
50 photos

I have just dismantled the motor from my lathe to clean it out, as I thought a piece of swarf may have entered the casing. There are enough slots and openings! As I removed the cover with the start switch on it, two wavy spring washers about 1 1/2" diameter fell out. There are none the other end. The housings look identical, as are the bearings. One at each end makes more sense to me. Has my motor been wrongly assembled for all these years please?


Brian Sweeting15/06/2018 16:55:14
347 forum posts
1 photos

Preloading the bearings perhaps?

David Jupp15/06/2018 16:55:22
668 forum posts
16 photos

It is probably correct. One bearing housing should be a tighter fit, whilst the other allows some axial movement to handle thermal expansion - the wavy washers will go in the 'floating' housing.

mgnbuk15/06/2018 17:02:45
506 forum posts
10 photos

The wave washers are to provide a small axial preload on the bearings to ensure that they roll & don't skid if the motor is run unloaded. I would put them back as they were, as they were most likely positioned as the maker intended.

Nigel B

Maurice15/06/2018 17:22:57
434 forum posts
50 photos

Fair enough. Thanks a lot for you help.


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