Tool Refurb #6: Guts.

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Blog entry by Joekwon80 posted 03-23-2012 02:34 PM 1526 reads 0 times favorited 5 comments Add to Favorites Watch
« Part 5: Wiring? Part 6 of Tool Refurb series Part 7: Gentlemen Start Your Engines! (motors) »

I finally bit the bullet and removed the engine from the cabinet yesterday. I didn’t want to go this far because I was afraid to see what was inside it after reading klw21's post. Luckily mine wasn’t as bad as his was but there were a couple things that caught my eye. Better for me to show you a picture than it is for me to try to explain it.

Here’s a closeup of the winding. Is this something I should be worried about?

There was also this weird thing with what looks like raptor claw marks in it.

Finally here are a couple videos of the engine spinning.

Is this noise something I should be concerned about? Is this the sound of a bad bearing or totally normal?

Anyways, I’ve also put the new blade on to see how it spins as well as the new belts.

I’ve decided that I’m not going to mess with taking the whole cabinet apart because there aren’t any signs of rust on the inside of the saw and I’m more likely to mess something up if I try to. For now I’m just gonna give the outside a nice clean up and coat of wax and then blow off as much of the sawdust from the inside as I can and start making the parts to cover the open parts of the cabinet. My dust collection system is getting here today as well as my new 220v sub panel! Super excited about that.

That’s it for today.

-- Joe Kwon

5 comments so far

View Ampeater's profile


440 posts in 3771 days

#1 posted 03-23-2012 03:10 PM

This is my best guess. I used to work at a company that made motors and generators.

The loose string should not be a problem as long as the copper windings are still all glued together by the varnish. The string is mainly used to tie the winding together so that they are located correctly until after the stator is dipped in varnish and cured in an oven. I would just cut the loose string off and not worry abount it as long as the winding are still solid. However, I would closely check the windings to ensure that whatever cut the strings did not also cut into the wire. This could short some of the windings together and cause the motor to overheat.

As far as the claw marks on the rotor or armature (the part that rotates), it appears to me that the black part is a balance weight that is held in place by some hits with a cold chisel. This is similar to balancing the wheels and tires on your car.

I really don’t know what is causing the noise problems..

I hope that this helps.

-- "A goal without a plan is a wish."

View crashn's profile


528 posts in 2489 days

#2 posted 03-23-2012 03:37 PM

Sounds like a bearing to me. I have a bandsaw that is making the same sound, going to take the motor in to have the bearings replaced, as long as its under 100 bucks. Else, for 250 I can get a new 2hp 220v motor from Grizzly.

-- Crashn - the only thing I make more of than sawdust is mistakes

View Joekwon80's profile


87 posts in 2286 days

#3 posted 03-23-2012 09:29 PM

Well the thing is it doesn’t make any noise when it doesn’t have the pulley on it. I guess the pulley is amplifying whatever metal noise is there.

Anyone know where I can get new bearings or at least what kind of bearings it takes? I feel like I could do a bearing replacement myself.

-- Joe Kwon

View Ampeater's profile


440 posts in 3771 days

#4 posted 03-23-2012 11:50 PM

It appears that in your tests that the motor shaft was always in the verticle position. However the motor is used in the horizontal position. The bearings should work better in the horizontal position.

See if it still makes the noise in the horizontal position.

-- "A goal without a plan is a wish."

View Beginningwoodworker's profile


13345 posts in 3697 days

#5 posted 03-26-2012 02:29 PM

You is making good progress on your Unisaw!

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