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Tool Talk Discussion Forum

Re: Motor brushes

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Author  [Modern View]

06-01-2014 05:46:59

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Two thoughts come to mind: You might be able to drill a small hole in the brush and reattach the lead with epoxy or put a small bolt through the hole with and reattach the brush that way. Find a larger brush and carefully sand or file it down to fit. There are many sources for brushes around.

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06-01-2014 16:16:54

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 Re: Motor brushes in reply to DGinVT, 06-01-2014 05:46:59  
That's what I was thinking, but will electricaly conductive epoxy bond to the carbon brush? They seem very slippery. Most of these projects are a one try deal and if it doesn't work, the money spent may as well have gone into buying a new part. But by then it's too late.
I've also thought about the mechanical repair with a pin or screw.

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06-02-2014 05:40:29

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 Re: Motor brushes in reply to Slowpoke, 06-01-2014 16:16:54  
A mechanical repair would be the best. with a small hole thru the brush. There will be heat generated from the electrical current and the epoxy may try and burn off or melt.

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06-02-2014 16:01:08

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 Re: Motor brushes in reply to DGinVT, 06-02-2014 05:40:29  
DGin VT,
A friend suggested cutting a flat piece of copper the size of the top of the brush, silver soldering the lead to it in the center, slip on the spring and install it. I was thinking of adding some electricaly conductive grease or paste between the brush and copper plate. Something like an automotive EC grease which can stand elevated underhood temperatures.


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06-02-2014 17:31:59

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 Re: Motor brushes in reply to Slowpoke, 06-02-2014 16:01:08  
I think your solution will work quite nicely. One has to be inventive these days.

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George Marsh

06-01-2014 06:05:14

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 Re: Motor brushes in reply to DGinVT, 06-01-2014 05:46:59  
I couldn't find a source to replace the brushes for a crapsman shop vac. I just waited for them to go on sale and bought a new vac.

I did get a new set of brushes for my old B&D right angle grinder, but they cost more than I could have bought a new grinder from China. The old B&D grinder is worth fixing.

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