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Tool Talk Discussion Forum

tablesaw motor, 1 HP,,

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maplehillfrm,pat

12-18-2007 09:04:24




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hey guys, I have this table saw that I have not used in a year, I put a new motor on it about 2 months before putting it in storage, It is a 1 hp single phase 110 motor GE is the brand,,, it used to start right up but draw some juice to get started,, and then purr,,,

I started it yesterday and it hummed, no biggie, I spun the pulley a bit and she took off, I let here run a bit and stopped it and had to do the same thing, I tried it not spinning the pulley and I tripped a breaker, I let it run today about 15 minutes figuring it would clean the contacts, but when trying to start it, it will do the same thing it needs a bit of "help" and then will run indefinately,,

Is there something I could do taking this apart, or should I take it to a electric motor shop and have them go thru it, almost seems like there may be a capacitator in there to start it??? as upon shutdown it will have a click sound after it reduces rpms,, thansk pat

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Marlowe

12-18-2007 14:51:08




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
closed motor or one with blower if it's a open one it might be full of saw dust you should use closed motors on table saws



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Dusty MI

12-18-2007 14:31:42




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
Also you could have the belt could be too tight, or the bearing in the saw arber could be tight. Take the belt off and turn then motor on, it should start right up with out any drag.



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maplehillfrm,pat

12-18-2007 23:16:09




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 Re: tablesaw motor, 1 HP,, in reply to Dusty MI, 12-18-2007 14:31:42  
update on info not given, I did not have the belt on at the time,, it was just the pulley,The saw arbor is in nice wheeling condition,,,,the motor is a closed ended unit,,

I like my fingers where they are,, for pulling on the belt to start it,, I have done it before ,,but that was a LONG time ago.. I is smarter now hahaha



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maplehillfrm,pat

12-18-2007 14:11:47




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
thanks guys I think for the 25 bucks I will just havethe shop do it, It cant be anything to aweful bad its a new motor,, thansk for the help,, it did sit in teh other side of the barn under cover but not out of the weathert changes, IE,cold hot warm damp etc,, I appreciate the help pat



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John T

12-18-2007 13:52:38




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
Pat, many years ago I was amazed when my uncle had an old motor he had to turn on n then quickly give it a good spin IN WHATEVER DIRECTION HE WANTED IT TO RUN n it would take off. Only years later I figured out its start winding was either bad or he had disabled it. Sounds like I agree with the other gents, your starting circuit, be it the winding or capacitor etc is bad. A split phase AC motor absent any a start winding dont know which direction to turn n it will just sit there in the mid magnetic pull point of the poles n draw heavy locked rotor current n do nuttin UNTIL OR UNLESS an offset start winding kind of gives it a push in the right direction. Theres a centrifugal RPM dependant switch that has the start winding engaged until a certain RPM at which time it opens and "CLICKS" and then closes n "CLICKS" at low RPM (start up)

If it has a capacitor Id check its terminals n clips cuz they can burn or corrode bad.

John T

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Bill in IL

12-18-2007 09:35:31




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
That click is a centrifical switch that engages and disengages the starting circuit when it gets almost up to speed. There is another winding inside the motor that is a fed from the capacitor causing a phase shift and it gets the rotor spinning. Could be dirty contacts on it or a bad capacitor. The capacitor would under the "hump" on top of the motor or in a control box. If it was stored somewhere with extreme heat it could have caused the capacitor to leak or somewhere with moisture it could have corroded the contacts on the centrifical switch.

If you feel comfortable with it its not hard to take the motor apart to have a peek. Just short out the capacitor before working on it or you could get a zap.

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Gerald J.

12-18-2007 09:28:09




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 Re: tablesaw motor, 1 HP,, in reply to maplehillfrm,pat, 12-18-2007 09:04:24  
The start winding isn't taking power. Could be an open winding (mouse chewed), a bad capacitor, burn start switch contacts, or a mechanically sticky start switch. Ingesting saw dust in a ventilated motor can cause the start switch to stick. There's a centrifugal operator on the motor shaft that you hear when its coasting down.

The longevity of the motor is greater if the motor shop opens up the motor and puts it back together than if you do those things.

Gerald J.

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36 coupe

12-18-2007 14:55:16




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 Re: tablesaw motor, 1 HP,, in reply to Gerald J., 12-18-2007 09:28:09  
When I was fixing water pumps I kept a capacitor in my tool box with wire leads and alligator clips.Just put the test capacitor across the suspect cap.You can jump the cap on small motors and they will start as split phase.Worn motors can develope enough end play that keeps the start switch from closing.Saw motors can get sawdust on the starting points.I use sealed TEFc motors on wood working tools.Pulling belts to start motors is risky.One fellow I knew pulled the belt to run a grinder,The wheel let go and put a nasty cut on his chin.Stand aside when starting grinders and tools.

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