Gettin' fixina tune up my Unisaw #18: Disassembling the motor to replace the bearings.

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Blog entry by Bothus posted 10-05-2009 04:53 AM 1549 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 17: Took the Unisaw home today Part 18 of Gettin' fixina tune up my Unisaw series Part 19: What to use? »

I cheated a little on the Honey Do list and started on the motor.


No need to film that.

It’s a short one.

Take care guys,


-- Jerry Boshear, Professional Kitchen Designer, amature woodworker.

3 comments so far

View ChunkyC's profile


856 posts in 3217 days

#1 posted 10-05-2009 05:08 AM

When the barrings start to fail what happens is the rotor starts to rub on the stator. It will rub it enough that it will cause failure. At that point, you send it to the recycler and go buy a new motor. Trying to repair a single phase motor is more $$ and time consuming than its worth. I would seriously doubt that you will ever see that motor fail in your life time. That is one nice looking motor, almost like it was never, or hardly ever, run.

-- Chunk's Workshop pictures:

View Karson's profile


35111 posts in 4364 days

#2 posted 10-05-2009 07:08 PM

The reason that there is no dist in the motor is that it is sealed with no air holes to put dust inside in the motor. The fan keeps it cool.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware soon moving to Virginia †

View ChunkyC's profile


856 posts in 3217 days

#3 posted 10-05-2009 07:32 PM

TEFC Motors, although claim to be totally enclosed, are in fact not totally enclosed. The area around the pecker head is open and in a couple of other areas too. The motor has to be able to breath some. As the motor heats up, the air pressure inside increases and forces the air out, PV=NRT. As the motor cools, it pulls dirty air in from the outside. Any TEFC motor that has any kind of hours on it will be dirty inside.

I work in a food plant and you’d think that we wouldn’t get “dirt” inside our thousands of TEFC motors on the production floor. I’m here to tell you that if you open any motor up you’ll find the inside to be rather dirty unless it is new or newly rebuilt.

What you have there is a motor that hasn’t seen much run time.

-- Chunk's Workshop pictures:

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