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Help...rebuilding tablesaw motor

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Forum topic by denniston posted 09-25-2015 03:16 AM 630 views 0 times favorited 3 replies Add to Favorites Watch
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denniston

4 posts in 1341 days


09-25-2015 03:16 AM

A while back the bearings went out of my older craftsman table saw, and I had quite the time finding the right bearing for it. I finally got around to asking a bearing retailer this week and got what I needed, so now it’s time to put the motor back together.

It all seems pretty straight forward, except I have a few extra parts. Now I know they say the mark of a good mechanic is being able to take 4 motors apart and putting 5 back together, but I don’t want to damage my motor. Basically, the parts consist of 3 very thin washers or more probably shims, and some sort of spring washer. The motor is a Craftsman 113.12202. It looks like to me that they go in between the right housing end and the bearing, housing > spring > shims > bearing. Does anyone have experience with these motors? Any input would be appreciated.

The parts diagram is available here: http://c.searspartsdirect.com/lis_png/PLDM/00039625-00001.png


3 replies so far

View David Taylor's profile

David Taylor

326 posts in 549 days


#1 posted 09-25-2015 03:49 AM

Thrust washers. They are used to take up, or, more properly, fill in the space at the end of the rotor to keep the rotor from moving front to back more than it should. The spring one is to give it a little bit of controlled play, as it needs to be able to have some (very little) play, and the flat ones limit just how much that play is. You’ll probably find that if you grab the shaft and try to push it and pull it in and out of the motor that it moves back and forth, probably about the distance those washers are thick.

They don’t show them on the picture you provide, I think because every motor uses a different set of washers, depending on how in or out of tolerance the parts were originally machined.

-- Learn Relentlessly

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denniston

4 posts in 1341 days


#2 posted 09-25-2015 11:32 AM

So, does it matter what end they are put in? I see there is one more on the left end. And what order should they be put in?

View bigblockyeti's profile

bigblockyeti

3668 posts in 1183 days


#3 posted 09-25-2015 01:13 PM

These are to control the axial position of the rotor and the spring washer is to slightly preload the bearings while allowing for thermal expansion. Typically these will all be located in the back end of the motor with the spring washer going in first and the shims on top, followed by the back bearing supporting the rotor. It is possible that some of the shims may go in the front end of the motor, the goal is to have the steel laminations in the rotor to be at the exact depth as the laminations in the stator.

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