Need help with a Baldor grinder

[rsanter]

So I was given this Baldor grinder for free because it didn't work. I though if I can't fix it I could part it out to help save another grinder.
When I plug get it in it just hummed. So I spun the wheels and plugged it in and still just hummed.
Looked in the bottom and I see a loose wire. I don't know where it goes so I touched it to where one of the other field leads was connected. Now it runs slow but it runs.
I suspect there should be a run capacitor between the legs but am not sure. Does anyone know where to get a wiring diagram or does someone have a grinder like this that they could tell me how it should be wired?

Bob

View media item 56321
View media item 56322
View media item 56323

 

[Davefr]

Based on my experience Baldor grinders only use a full time run capacitor in the start winding. (no centrifical or relay based starting circuit).

Just a guess:
-run winding to line voltage via switch
-start winding in series with run cap, one leg to common and the other to line.

I have an old 1/2 HP Baldor base laying around. Just PM me and I can probably get the value of the run capacitance if you need it. I can't confirm the wiring because the stator is burnt up.

It's probably pretty close to this but one direction/one speed (go to page 10):

https://www.baldorvip.com/servlet/productInfoPacket/1022W.pdf

 

[senlow]

I have a Baldor grinder that is about the same vintage as your grinder. Mine was made in 1948 and does have a run capacitor (no start cap). It's 4 microfarad, 440 volt.

 

[My Old Tools]

Baldor website has wiring diagrams for a lot of older grinders.

 

[frankush]

Another option would be to take it to a shop that rewinds motors. They should have the capacitor and would know how it's wired.

 

[jallyn]

Definitely needs a capacitor, likely a run capacitor. Since it is a 2.5 amp motor you could protect the windings by using a slow blow 5.0 to 7.5 amp fuse while you experiment with wiring the capacitor to the motor leads to maximize speed/power. And once you have it running you could continue to protect the motor windings with that fuse.

 

[Packard V8]

Another option would be to take it to a shop that rewinds motors. They should have the capacitor and would know how it's wired.

There's one motor shop remaining in this good-sized metro area and it's industrial motors only. They have a $75 bench charge to make sure guys like us don't waste their time with our piddly old ****.

Your results may differ.

jack vines

 

[454ragtop]

I'd ask over on OWWM.org, in the electrical section. Be surprised if they can't help.
HTH, JIm

 

[rsanter]

Another option would be to take it to a shop that rewinds motors. They should have the capacitor and would know how it's wired.

That's a good idea, sort of.
There is a motor shop in Fresno that the old guy has been helpful to me in the past. Might see if he is still there.

Thanks
Bob

 

[Norcal]

Unearthed this old thread to thank the contributors for providing the information to repair a 1/2 HP 1800 RPM Baldor grinder I picked up at the ReStore so dirt cheap I could not resist it, tried to talk myself out of it since already had 8 grinders & really do not need another but was so cheap 'cuz it did not run right, BTW, it was $8.66 including tax. I could not find a wiring diagram on ABB/Baldors website, but did find a link here for one.