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Forum topic by Gixxerjoe04 posted 08-12-2015 09:32 PM 917 views 0 times favorited 24 replies Add to Favorites Watch
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Gixxerjoe04

835 posts in 1043 days


08-12-2015 09:32 PM

Was cutting something small up today and I heard like a thud and my saw lost momentum. Thought the motor blew but realized the belt had come off. Put it back on thinking everything was good, back to cutting and I smelled smoke. Thought it was the belt rubbing but took it off to see and it’s coming from the motor. Not sure what’s wrong with it, trying to upload a video so you all can hear how it sounds.


24 replies so far

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Gixxerjoe04

835 posts in 1043 days


#1 posted 08-12-2015 10:02 PM

The motor sounds like crap with the belt on as you can see in the 2nd video and you can see the smoke start to come out.

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johnstoneb

2147 posts in 1639 days


#2 posted 08-12-2015 10:05 PM

You might have a bearing going out and letting the armature contact the fields under load. Check and see how much movement you have in the shaft with the belt off.

-- Bruce, Boise, ID

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David

66 posts in 1493 days


#3 posted 08-12-2015 10:07 PM

Bearings are going on the motor. Just replace the the motor, lot easier and cheaper than trying to rebuild the motor.

-- http://littleredshop.net "A man that works with his hands, knows his soul" " Have Fun, Go Fast, and Take Chances for Christ's Sake!!"

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MrUnix

4234 posts in 1665 days


#4 posted 08-12-2015 10:15 PM

Bearings are going on the motor. Just replace the the motor, lot easier and cheaper than trying to rebuild the motor.

If it’s just the bearings, then it’s a $10 fix and is easy to do.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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Gixxerjoe04

835 posts in 1043 days


#5 posted 08-12-2015 10:16 PM

Looking at motor prices, cost more than what I paid for the saw.

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Gixxerjoe04

835 posts in 1043 days


#6 posted 08-12-2015 10:22 PM

harbor freight has 2hp motors for $160 plus 20% coupon

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MrUnix

4234 posts in 1665 days


#7 posted 08-12-2015 10:40 PM

If you want to replace the motor, then you just need to get one with the same frame size (mount), rpm, shaft size and ensure you can make it spin in the right direction. If you have already condemned the old motor, it won’t hurt to crack it open and see what’s wrong. 4 bolts and the end bells will pop right off.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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Gixxerjoe04

835 posts in 1043 days


#8 posted 08-13-2015 01:11 AM

Took off the end, there’s some play in the shaft and the bearing on the end isn’t smooth when spinning. Curious to the burning smell those. The stuff wrapping the copper, some spots are black like they burnt but wondered why it would do that.

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01ntrain

146 posts in 536 days


#9 posted 08-13-2015 01:21 AM

From the looks of it, the windings don’t look bad at all, but I would suspect a shorted winding due to the burning smell and obvious blue smoke coming out of the motor.

Only way at this point to tell is to do some measuring with a meter…..

The play in the shaft is somewhat normal, the roughness of the bearing is not. If you can pull the armature you can examine the fields to see if anything else is burnt.

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MrUnix

4234 posts in 1665 days


#10 posted 08-13-2015 01:25 AM

If the bearings were bad, it would produce an increased load on the motor and cause it to run hotter (as well as allow contact once they get really bad). There really is only two things that can go bad with an induction motor – bearings or insulation/wiring… and the former can cause the latter.

Looks like you caught it in time. Clean things up a bit, put in the new bearings, and you should be good to go for another couple decades.

Cheers,
Brad

PS Get some good quality bearings from a supplier like Accurate. Probably run you $5 a piece give or take.

-- Brad in FL - To be old and wise, you must first be young and stupid

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cutmantom

389 posts in 2501 days


#11 posted 08-13-2015 01:28 AM

It could be the centrifugal switch, if it goes bad the motor will run but in start mode and will get hot, I was using a HF drill press and this happened, actually it was only something coming loose that was the problem and a motor shop fixed it easily, can’t remember the price but it seemed to be cheap, if you just change the bearings be ready to turn it off when you start it, if it’s the run start switch or the capacitor it should obviously sound different and get warm fast

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wunderaa

243 posts in 1669 days


#12 posted 08-13-2015 01:45 AM

Typical air gap between rotor and stator is like 0.010” and 0.050”. Depending on how badly the bearing failed, its possible that the rotor and stator rubbed on each other. That can cause all of the symptoms you’ve seen. You should see some wear marks along with the char. Still need to check the windings with a meter to see. Worth it to just swap the bearings and cross your fingers. :)

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Gixxerjoe04

835 posts in 1043 days


#13 posted 08-14-2015 12:21 AM

Taking the motor to a repair place tomorrow to see what they say about it. Was talking to my parents about it and they felt bad about it and know I have a show coming up and wanted to get me a gift by buying me a new table saw. Pretty nice of them, of course they just know about the big box stores and said the delta at lowes looks good or larger model ridgid. Hoping my motor can be fixed though since all of my different sleds and outfeed table are made for it, don’t feel like making new ones haha.

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distrbd

2227 posts in 1913 days


#14 posted 08-14-2015 03:22 PM

Here the Electric motor repair shops charge $70/hour to just look at the motor to see what’s wrong.

I recently went through a motor problem(Bandsaw) and had smoke coming out of it plus that burnt motor smell so I was sure the motor was burnt out, took the capacitor out and went to the local repair shop, the electrician was kind enough to check the motor for me for free and to my surprise ,it was the capacitor that was the cause of all the smell and the smoke.
I only paid $40 for the new cap. and back it went to service,

-- Ken from Ontario, Canada

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Gixxerjoe04

835 posts in 1043 days


#15 posted 08-14-2015 03:59 PM

Well they said they’d give me an estimate on getting it fixed to see if it’s worth it first, so hoping they won’t charge for that. The one end is already off of it.

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