[How-To] Help with grinder

[Mheaton92]

I am rebuilding a sanford surface grinder and the start capacitor for the motor was gone. It was working but when I was tearing down I figured out it was gone. I ordered a new one but wanted some help connecting the new one. I will post some pictures of someone could point me in the right direction.

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[Ulma Doctor]

does the motor plate give a capacitance value?
some motors don't utilize a start capacitor at all, just a separate start winding wired in parallel

 

[Mheaton92]

does the motor plate give a capacitance value?
some motors don't utilize a start capacitor at all, just a separate start winding wired in parallel

When I get home I will check. There was a spot for it so I figured it took one but could be wrong.


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[markba633csi]

It may be a split phase motor, they don't use a start capacitor

 

[Mheaton92]

It may be a split phase motor, they don't use a start capacitor

It had a spot for one here

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[Mheaton92]

Here is the tag from the motor.

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[markba633csi]

I think that is just a junction box- rather than a capacitor cubby
-M

 

[Mheaton92]

So it seems like everyone is questioning if it even takes a start capacitor. I believe it does, someone else was restoring the same surface grinder. They had a motor with the same HP and brand. They sent me the start capacitor information and I ordered one, What I needed was help connecting it. I was reading about wiring it in but didn’t want to make any mistakes. Was just looking for some guidance.


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[Mheaton92]

I think that is just a junction box- rather than a capacitor cubby
-M

Here is a picture with one in it. Also the cubby next to it is off my drill press motor.

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[markba633csi]

It would be wired in series with either the wire from the centrifugal switch or the one from the start winding (both look like light colored fabric covered wires in post #1)
Polarity doesn't matter
So, one of those two wires goes to one post of the cap, the other post of the cap goes to power. If in fact this is a capacitor start motor.
-M
You mentioned in post #1 that the motor was working, if so why did you assume a cap was required/missing? Was the motor starting sluggishly?
Looking at post #5, it looks to me (if that's the factory wiring, and it may not be) it would be a tight squeeze to stuff a cap in there