Craftsman 10" 3HP Table Saw motor issues. - Router Forums
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post #1 of 21 (permalink) Old 03-24-2016, 04:47 PM Thread Starter
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Default Craftsman 10" 3HP Table Saw motor issues.

I admittedly have pretty much abused the machine over the years and it finally gave out on me. It would start, run for about 2 seconds then trip my GFI outlet or just lock up. I know nothing about motors and was going to just junk it since I have a brand new Bosch table saw and a Delta Cabinet saw and keep the stand/table for something else however I wanted to see if I could fix it so I took it apart.

The windings were all black from something that had been burning, I sanded the one brass ring down to clean it up. I checked the brushes, one of them gets stuck and doesn't come out. I cleaned them up, slapped everything back together and started it and it immediately locked up and smoked. Does this sound like a brushing issue? I'd hate to just toss out a machine someone else could get use out of or I could keep around as an emergency back up if its just a $10 part.
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post #2 of 21 (permalink) Old 03-24-2016, 04:54 PM
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Chances are good when it started smoking that that was its dying breath. If it was locking up it may have been bearings which might have solved the problem, possibly. The smoking is a good chance of insulation on the windings getting too hot. A motor running under no load is using mostly voltage to turn. As the load increases it draws more current which heats the innards up. Too much cooks it and when it isn't turning or barely turning that happens very quickly.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #3 of 21 (permalink) Old 03-24-2016, 07:56 PM
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Quote:
Originally Posted by 96BelisleAs View Post
I admittedly have pretty much abused the machine over the years and it finally gave out on me. It would start, run for about 2 seconds then trip my GFI outlet or just lock up. I know nothing about motors and was going to just junk it since I have a brand new Bosch table saw and a Delta Cabinet saw and keep the stand/table for something else however I wanted to see if I could fix it so I took it apart.

The windings were all black from something that had been burning, I sanded the one brass ring down to clean it up. I checked the brushes, one of them gets stuck and doesn't come out. I cleaned them up, slapped everything back together and started it and it immediately locked up and smoked. Does this sound like a brushing issue? I'd hate to just toss out a machine someone else could get use out of or I could keep around as an emergency back up if its just a $10 part.

what type of saw is it???
portable or contractor..
direct drive or belt driven...
amp rating???

sounds like a cooked motor...
either the start switch or the start cap/windings went south...
the trip is either from overload or internal short to ground...
lean to internal short to ground..

see if these help...
gotta be sumptin in these PDF's...

.
Attached Files
File Type: pdf CAPACITOR TESTING.pdf (61.4 KB, 90 views)
File Type: pdf Diagnosing Electric Power Tools 101.pdf (386.8 KB, 130 views)
File Type: pdf Electric Motor Troubleshooting (Polyphase).pdf (850.1 KB, 54 views)
File Type: pdf How to METER test electric motors.pdf (217.2 KB, 88 views)
File Type: pdf Is it the Brushes or the Switch.pdf (182.5 KB, 51 views)
File Type: pdf Maintenance and Troubleshooting of Electric Motors.pdf (68.0 KB, 61 views)
File Type: pdf meter motor testing.PDF (279.1 KB, 88 views)
File Type: pdf TESTING armature windings.pdf (100.0 KB, 63 views)
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post #4 of 21 (permalink) Old 03-24-2016, 08:02 PM
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When you let the magic smoke out of anything electrical, it's usually ready for the trash can. You are supposed to stop using it and fix or replace the offending pieces BEFORE letting the smoke out.

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post #5 of 21 (permalink) Old 03-24-2016, 09:12 PM
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No Smoking in my shop.

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post #6 of 21 (permalink) Old 03-24-2016, 11:18 PM Thread Starter
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what type of saw is it???
portable or contractor..
direct drive or belt driven...
amp rating???

sounds like a cooked motor...
either the start switch or the start cap/windings went south...
the trip is either from overload or internal short to ground...
lean to internal short to ground..

see if these help...
gotta be sumptin in these PDF's...

.
Just got home, will have to check in the morning. It is direct drive. I know for sure one of the brushs is bad because like I mentioned the spring doesn't push one of them out.

Quote:
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When you let the magic smoke out of anything electrical, it's usually ready for the trash can. You are supposed to stop using it and fix or replace the offending pieces BEFORE letting the smoke out.

Charley
It wasn't smoking until after I took it apart and restarted it. It was severely lagging and then started cutting off. However wasn't smoking. It smoked for a fraction of a second. I had my hand on the switch and hit it immediately. If its broke its not a big deal I just don't want to junk it if it can be fixed for $10.
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post #7 of 21 (permalink) Old 03-25-2016, 07:44 AM
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If both brushes aren't making good contact in a universal motor it isn't going to run.

Does the motor turn freely when unplugged?

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post #8 of 21 (permalink) Old 03-25-2016, 08:54 AM
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If the winding are black you probably melted the shellac off the windings
Take the motor to a electrical motor shop for an estimate on a rewinding
probably about a $100.00 or so.
Look on CL for an equivalent one and R&R the old one
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post #9 of 21 (permalink) Old 03-25-2016, 10:13 AM
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Eric - If you decide to scrap it out, I might be interested in the rip fence and rails. I am the instructor for a wood shop class at a "Third Age Learning Center" for Seniors. We have a table say that has a broken fence. Rather hard to set! The saw table is 27 inches, front to back.

I would appreciate you keeping me in mind is you decide to dump it.
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post #10 of 21 (permalink) Old 03-25-2016, 10:59 AM
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Quote:
Originally Posted by smitty10101 View Post
If the winding are black you probably melted the shellac off the windings
Take the motor to a electrical motor shop for an estimate on a rewinding
probably about a $100.00 or so.
Look on CL for an equivalent one and R&R the old one
Where can you find a place which can rewind the motor for $100? I just took my 1/2 hp drill press motor in and they want $600 to rewind it. I would like to get my motor fixed.
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