small electric motor question

[jabberwoki]

I have a small 110 motor that used to work now it just hums when you turn the switch?

 

[The Cobbler]

what sort of motor? does it have capacitor start? bearings or bushings seized?does it have a start winding?

 

[jabberwoki]

Looks like a standard motor it`s on a sander. No Capacitors that i can see and it spins freely by hand.

 

[Dagny]

picture?

 

[jabberwoki]

Here tis

 

[lilredex]

If you spin it when it hums, does it run again? If yes blow out the start winding switch on the end.

 

[jabberwoki]

No tried spinning it by hand and no go.

 

[wyliesdiesels]

Do you have a pic of the nameplate for the motor?

 

[jabberwoki]

No thats all ive got

 

[BillK]

Make and model number of the sander ? What is in the box on the motor ? Do the motor wires go into the sander or straight to the plug ?

 

[jabberwoki]

Foley belsaw 311 . There is a switch on the side
Ill look at it again tonight

 

[marak]

Have you tried removing the cover plates to access the bearings/bushings. Maybe they are gummed up/worn out/seized up. Clean up/replace as needed. While in there, check the ohms on the windings. If you get zero there is a short, infinity there is an open. Maybe others can chime in on what resistance there should be.

 

[wyliesdiesels]

According to numerous searches on google it’s a GE 1/2 hp 3450 RPM motor. I cannot find anything about capacitors

 

[PoorUB]

Most small general purpose motors have a centrifugal switch to energize the start windings. After time the contacts get dirty and simply filing the contacts to clean them up often cures the problem.

The switch is under the end bell of the motor, opposite of the shaft.

 

[nadogail]

I would check for a dirty or binding start switch.

 

[four.cycle]

parts and repairs: Center Electric - down on South "M" street between So. Tacoma Way and Center Street.

 

[jabberwoki]

Center electric... great guys for sure but boy do they charge.

I`ll pull it apart this weekend.
Thanks for all the input maties.

 

[four.cycle]

oh yeah... higher than hell... .but they have the stuff on the shelf, generally.

 

[marinusdees]

oh yeah... higher than hell... .but they have the stuff on the shelf, generally.

Mike Thayer at All Electric Motor Service. In N. Puyallup, on Milwaukee Ave.

 

[four.cycle]

ah! did not know that...
was years ago.. had to get a motor fixed for some machine.

 

[jabberwoki]

So got it appart going to clean it out and re pack the bearings.
Here`s pix from the guts, where are these contacts located?

 

[Bert_]

Looks like the centrifugal switch might be stuck. The mechanical part of the switch is what's in your second picture.

Spring pressure should force it out but you should easily be able to push it in with your hand. It would definitely cause a hum and no start condition.

 

[jabberwoki]

Ok so i cleaned and lubed the Centrifugal switch , it was a tad stiff.
I found the contacters, looked like a set of points . They were dirty so i cleaned them with some fine sandpaper .
Finally blew out the motor and lightly sanded the barrel on the rotor , just some light surface rust . then greased the bearings.
Plugged it in and all it wants to do is wobble back and forth?

 

[marinusdees]

Ok so i cleaned and lubed the Centrifugal switch , it was a tad stiff.
I found the contacters, looked like a set of points . They were dirty so i cleaned them with some fine sandpaper .
Finally blew out the motor and lightly sanded the barrel on the rotor , just some light surface rust . then greased the bearings.
Plugged it in and all it wants to do is wobble back and forth?

Mike Thayer. End of story.

 

[jabberwoki]

Don't really want to spend any cabbage on this one. just trying to get to run to sell.