Fixing A Bench Grinder That Will Not Start 

Thanks Ben. My grinder wouldn’t start unless I gave it a mighty spin by hand. A replacement was going to cost over £90 so I did what you showed. Removed the base plate, saw the capacitor and removed it. Elsewhere on RU-vid I found out what it did and how to test it. It was not ok. Found the spec on the broken one for a replacement, got one off eBay for a fiver, refitted it with new spade terminals as the originals were too small. Cleaned it up, reassembled it, switched on and Bingo! Starts first time every time. Thanks mate! Saved me £85 plus I learned what motor capacitors do (as against lighting capacitors) so I’m well pleased!

Hi Ben, thanks so much for your help! Mine was the same as this! Saved me a lot of money! Thanks from your American Cousin!! Jerry!

Thanks friend for showing the activities in your workshop. Excellent.

outside in the summer sun with no shop and a flea market bench grinder that worked yesterday. This helped. 😊

Thank you for making this video...

Excellent result Mate, If the grinder has been sitting outside and got wet that might well give you a little tingle I would leave it in the airing cupboard for a week I would also re do the earth connection in the motor (I expect you have done this already ) 👍 😊

Looks pretty good! Do you have an idea how I could fix my old Shopmate 2601TO? It gets bogged down when I start grinding something against the wheel. THANK YOU!

Thanks for the helpful video. I have a (old) bench grinder that has the same problem. I replaced the original capacitor with the replacement from a motor repair outfit. Connected the new capacitor but still the same problem. Any ideas? Runs fine, just have to manually start it.

Great job!

There was no information on my machine,just an old one I inherited from my grandpa and wanted to clean it up a bit. The only clue is the bearings are made in England,if that's helpful at all. Other than that,I'm not sure how this motor is called in english,but yes,this seems to be the principle behind it. There's a plate with a thin piece of metal on it,that helps engage the coil with full voltage and kickstart the motor. Then after the rotor starts spinning,this centrifugal switch releases the piece of metal and it's normal single phase. So basically,this switch is replacing the capacitor. If misplaced on the rotor,a bit further away so it won't push this piece of metal enough to make contact,the motor won't start. Sorry if the description is not very accurate,I'm not very good at this,and only found out how it operates today thanks to the comments here.

Can replace 2.5 to 3.5 uf capasitor, it is same volts

A nice easy fix - saves tracking down a replacement capacitor - I didn't hear a centrifugal switch so I guess that one is a motor run rather than just a motor start cap - probably anyway. The tingling on the case is odd though - maybe test it with a megger meter if you've got one, see if the insulation is breaking down.

Nice restoration. Dealing with a capacitor makes this a lot trickier. Thanks for sharing this!

Nice one ben

I have a hummer like yours .I have to spin it fast to run.It’s a Craftsman 120 volt in USA.It doesn’t have a capacitor.It has a small winding that’s wired to the big one on axel.You mentioned that’s called split phase.That’s all I know.

Nice job.Just a bad connection. I was thinking you was going to take out a starting capacitor from something else.How would you have fix it if the starting capacitor was messed up?

How satisfying to get it working. How old is it? Surprised it had a cheap Chinese starter coil and strange still getting a tingle from the switch but dont think you inspected that.

Nice one .I have the same machine.I"be been using it for over 15 years.I"m a shoe maker.now it won't on.no power at all.what can i do.keep up the good work thanks.

Nice fix might be a bit damp if you got it from scrapyard try drying it out

Awesome I guess I know what’s wrong with my bench grinder

Mine doesn’t have a starter coil like they. When I start it I bye turning it I here’s set of points click in

How to fix a start dat dont want to retain the bench grinder only works when u hold the start?

Sir . How many wires are going to the motor?

Is there any danger of discharge from a capacitor?

👍

Hi Ben. We share a lot of common interests. Unfortunately

My Black & Decker bench grinder only buzzes and won’t spin. No capacitor. Brushless DC motor. Is it fixable?

How do i connect direct

Any hints on what to do when the grinder wont spin at all unless you loosen the wheel on one side? Mine has a wire brush on the left. A grinding stone on the right. I switch it on and it humms but is jammed. I cant even turn it by hand. I loosen the wire wheel side, just a quarter turn and off she goes. The wire wheel itself wont spin because its now loose, but the right side grinding disc is spinning at least. Hope that makes sense.

Breh. They threw it away for a reason. It needs rewiring. Brand new one cost $40.