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Old 03-07-2011, 09:15 PM
GMR GMR is offline
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bench grinder help

Hoping you all can help. I have an old (30 yrs) Craftsman 1/2 HP bench grinder that was working fine until I got a piece of steal caught under the wheel that stalled the grinder for a few seconds before I could turn it off. Now it just hums when I turn it on. I can turn a wheel by hand, with the grinder "on", and both wheels will turn without any drag under my power. However the grinder won't turn them. I looked at the parts list and only thing I can guess may be bad is a "starter relay". There is no mention of a capacitor. Don't want to trash it if I can help it as it suits my needs.

Any tests I can perform to locate the problem? Any suggestions on what may be wrong?

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Old 03-07-2011, 09:45 PM
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Not sure I am reading you right, but if you can turn the wheels by hand and get it to start up that way then it is a capacitor.
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Old 03-08-2011, 03:54 AM
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Honestly, probably not worth fixing..... Harborfrieght has them new with stones for 40 bucks..... had mine for 10 plus years works well
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Old 03-08-2011, 07:45 AM
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weirdbeard - I can turn the wheels by hand but the grinder will not start up when doing so. I didn't see a capacitor listed in the parts list diagram. Only a starter relay.

EODGuy - I wanted to avoid the newer off shore grinders. Glad you're having good luck with it. Probably have to go that route I guess.
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Old 03-08-2011, 06:34 PM
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Well I don't blame you at all for wanting to keep your old tools going.. They really don't make um like they use to.

It should have a capacitor for the start up, but even when they die you can manually start them by hand. You may have burned a winding in the motor and that would not be a cheap fix.
Not sure about that starter relay.. I have never heard about anything like that on a single phase 110 tool.

Maybe someone else will chime in. good luck.
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Old 03-11-2011, 06:18 PM
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thanks weirdbeard - it's toast, next stop Harbor Freight
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Old 03-11-2011, 08:36 PM
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I wouldn't buy an HF.. my grandfather has 1 he replaced an old ( 50 years old or so ) Sears. that stopped working just the same... the new grinder will bog down if you touch it to sharpen a chisel. and the stones will not stay tight.. I have a 15 year old craftsmen that works perfect. it is mounted on an HF grinder pedastal tho
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Old 06-30-2011, 02:55 PM
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By any chance did you ever find out what went wrong with your grinder?

I have almost the exact same thing - 30+ year old Craftsman 1/2 hp grinder. Bogged it down too much polishing some metal and now it just buzzes. Wheels turn fine, but won't spin on their own.

I hate to junk the thing. It's built like a tank.

Can windings be repaired if that's the problem, or do I have to scrap it?
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Old 07-01-2011, 07:04 AM
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The cap is located under and inside the grinder base, go to the sears web page an look for the parts, the tools you can buy any part for that grinder.

example

http://www.searspartsdirect.com/part...&prst=&shdMod=

Last edited by unix; 07-01-2011 at 07:21 AM.
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Old 07-03-2011, 12:13 PM
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First make sure the power cord and switch is OK and you have 120 volts at the motor.
If that's OK you need to make sure you don't have an open winding before replacing the starter relay or cap.
Split the motor to access the wires that enter the windings.
It should have a start winding and a run winding. Check for continuity across each winding.
There will be a common connection from the windings to the neutral wire that may have opened.
If the winding are fried it's junk.

vicrod
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