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Is my table saw motor dead?

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Forum topic by justinwdemoss posted 12-16-2010 11:05 PM 6476 views 0 times favorited 40 replies Add to Favorites Watch
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justinwdemoss

146 posts in 1639 days


12-16-2010 11:05 PM

Topic tags/keywords: craftsman table saw saw motor 1 hp 11329940

I have been rehabbing an old craftsman table saw 113.29940. So far I have replaced the switch with a paddle, added a link belt, and removed the rust. Today, while making some cuts in some 6/4 red gum, the saw tripped a breaker for the shop. After resetting the breaker I tried the saw again. The motor makes a loud buzzing noise, but does nothing except dim the lights in the garage. It is the original motor. Is it time for a new one? If I get a new one, is it safe to get a more powerful one? It is 1 hp, I was thinking 1.5 hp would be nice. Any recommendations as to where I should buy the new motor from….if I need it.

-- Justin in Loveland, OH


40 replies so far

View cabmaker's profile

cabmaker

1311 posts in 1553 days


#1 posted 12-16-2010 11:20 PM

You will certainly be okay with a 1 1/2hp. Those older craftsmn saws were notorious for collecting sawdust inside the case which was responsible for a rewind in one I had twenty years ago. Good luck !

View Tim Dahn's profile

Tim Dahn

1479 posts in 2309 days


#2 posted 12-16-2010 11:22 PM

Is the motor locked up? Try to spin the motor (with the saw unplugged) something may be preventing it from moving, if it spins, try it again.

-- Good judgement comes from experience and experience comes from poor judgement.

View justinwdemoss's profile

justinwdemoss

146 posts in 1639 days


#3 posted 12-16-2010 11:27 PM

Timbo,

I spun the motor shaft by hand, then plugged it back in and turned it on, nothing! Still has the really loud hum/buzz.

-- Justin in Loveland, OH

View Howie's profile

Howie

2656 posts in 1667 days


#4 posted 12-16-2010 11:30 PM

Does it smell funny? Like burnt insulation?

-- Life is good.

View dbhost's profile

dbhost

5387 posts in 1976 days


#5 posted 12-16-2010 11:38 PM

It could be a blown start capacitor as well. If you have a shop near you that rebuilds electric motors, see what they want to fix yours…

-- My workshop blog can be found at http://daves-workshop.blogspot.com

View THOMRIDER's profile

THOMRIDER

99 posts in 1813 days


#6 posted 12-17-2010 12:01 AM

well i had the same thing happen to my pool filter motor and it was blown bearings in the rear, causing the magneto to stick to the surrounding magnets and not spin freely hence a buzzing sound, when this happen to me it was more expensive to have it rebuilt than to buy a new one. My motor was a 1.5 hp and I got a 2hp for less than rebuilding the old one. I went to Grainger they had the best price.

If you need any further help let me know.

-- Its all about the jigs

View knotscott's profile

knotscott

5601 posts in 2120 days


#7 posted 12-17-2010 12:14 AM

I was thinking that it could be a capacitor as well. Check inside the cans on the motor…it’ll look obviously defective if it’s bad…cheap and easy to fix. It could also be a stuck centrifigal switch.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View lew's profile

lew

10152 posts in 2500 days


#8 posted 12-17-2010 02:41 AM

I agree with knotscott, about the centrifugal starter switch.

I had an old craftsman radial arm saw that would do this on a regular basis. Sometimes I could fix it by blowing compressed air into the end of the motor. Other times, I had to tear it apart to get the dust out.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View justinwdemoss's profile

justinwdemoss

146 posts in 1639 days


#9 posted 12-17-2010 03:44 AM

Howie,

There was a bit of a hot smell, but I had noticed that the belt was loose again and this is likely the cause of the slight smell as the belt was starting to slip.

knotscott,

Is the capacitor in the little tube-like cover that is on the outside/back of the motor? How would I know if it is bad?

Then, where would the centrifugal switch be located?

Thanks

-- Justin in Loveland, OH

View Camper's profile

Camper

232 posts in 1600 days


#10 posted 12-17-2010 03:54 AM

A capacitor is bad if it is swollen or leaking. Those are the two most common visible signs of a bad capacitor. Good Luck

-- Tampa-FL

View justinwdemoss's profile

justinwdemoss

146 posts in 1639 days


#11 posted 12-17-2010 03:59 AM

I just took a look at the capacitor, the end with the collections (top) has what appears to be a web-like blobs of white covering half of it. If I didn’t know better, i would think that some insect has built a cocoon on it. At about $2-3 to replace it, I think I will start there. Please let me know if you think this is looking more and more like the problem.

-- Justin in Loveland, OH

View cpollock's profile

cpollock

34 posts in 2158 days


#12 posted 12-17-2010 04:16 AM

I think we have as much fun fixing these tools as using them, I know I do. Nothing beats the satisfaction of beating the Grim Reaper of tools. Good luck on the motor.

View justinwdemoss's profile

justinwdemoss

146 posts in 1639 days


#13 posted 12-17-2010 05:28 AM

Sorry CharlieL,

I used the shop vac to suck some dust out of the motor, but did not try to remove the housing to give it a look. I noticed that the extension cord was a 13 amp and the motor is 14, so this may have lead to the initial problem. i by-passed the cord by moving the saw to the outlet, but that only got the same result. The saw work before the new switch and after for several hours of operation, so I doubt the switch is the issue. When the saw tripped the breaker I thought about the other things on the circuit so I plugged it into a different circuit. It tripped the safety breaker/switch on that power strip. All of your ideas were solid and I tried them out before looking at the capacitor. Sorry for not getting back to you on them. I was in a panic and was hoping for a quick fix and the ideas just kept coming.

Thanks everyone that added their two cents, please keep the ideas coming and I will try to stay up on this post.

-- Justin in Loveland, OH

View Howie's profile

Howie

2656 posts in 1667 days


#14 posted 12-17-2010 03:03 PM

Justin FWiW…my ex wife bought a piece of a bridge just outside Loveland once. (g)

-- Life is good.

View knotscott's profile

knotscott

5601 posts in 2120 days


#15 posted 12-17-2010 03:37 PM

An internal centrifugal switch is usually at the opposite end of the motor as the shaft. If you can get at it, sometimes just tapping it with a screwdriver or probe will release it. Even a light tap on the end with a rubber mallet might release it. You should also spray it liberally with something like WD40.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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