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TheWoodHaven2 • View topic - Useful resource for motor brushes

It is currently 17 Jul 2019, 07:49

Useful resource for motor brushes

Here's the place to talk about all your table saws, bandsaws, routers and dust extractors. In fact anything that makes noise and uses electrickery.

Useful resource for motor brushes

Postby 9fingers » 27 Jun 2019, 10:13

I had a motor in for repair the other day. A nasty horrid brush motor but it was for a mate so I accepted the request with good grace.

All it needed was a good clean up and new brushes as one had worn to almost nothing.
However this was an old motor and spares are rare and even refurbished motrs sell for silly money on ebay.
After a bit of a search I came across

who not only had what I needed but also do a huge range of brushes for the more obscure brands of power tools that tend to have poor spares support.

Well worth a look and a possible tool life saver.

Bob

Information on induction motors here
https://drive.google.com/file/d/0B_GZrX ... sp=sharing
Email:motors@minchin.org.uk
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Re: Useful resource for motor brushes

Postby kirkpoore1 » 29 Jun 2019, 22:11

A website like this should also have replacements for motors that use brushes just to start, such as repulsion-induction motors. While rare now, they were once pretty common (like, back in the 1930's and 40's) and are good motors. I have not yet had to replace brushes on one of these, but I've seen some that were getting pretty short.

Kirk
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Re: Useful resource for motor brushes

Postby 9fingers » 29 Jun 2019, 22:23


Information on induction motors here
https://drive.google.com/file/d/0B_GZrX ... sp=sharing
Email:motors@minchin.org.uk
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Re: Useful resource for motor brushes

Postby TomTrees » 11 Jul 2019, 05:24

I have a few questions about motor brushes, but never asked...

I've often wondered if anyone has made their own brushes?
I bought a pack of twenty for buttons off of eBay some time ago, for my dad's mitre saw.

Could one just pop' em off the springs, and stick them on something else?..
Can you shave them down or even glue them together?

And is there any reduction in noise, or power gained from having a new brush?

Thanks folks
Tom
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Re: Useful resource for motor brushes

Postby 9fingers » 11 Jul 2019, 09:22


Information on induction motors here
https://drive.google.com/file/d/0B_GZrX ... sp=sharing
Email:motors@minchin.org.uk
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Re: Useful resource for motor brushes

Postby TomTrees » 11 Jul 2019, 16:12

Wow, it is certainly a complicated subject then !

I thought it might have been lot simpler than that, boy was I being a bit optimistic, to say the least. :lol:
I did feel a little like I was being a little lazy, so did a minute of random keyword youtubing before posting.
I'm glad I hadn't trawled through many videos, as it would have been a pointless endeavour for the kind of thing I was looking to find.

I have a wee three wheeled bandsaw, that I was thinking of making into a strip sander, but the thing is soo loud, that makes me not want to bother with, plus I don't really like sanders,
as I have no dust collection in the workshop.
I try and find a way of cutting things, as a workshop rule, rather than abrade them.


I was thinking that the brushes could be worn on this thing, due to the noise,
Never checked them though.
I must have a look at them sometime, to see if,
A: If they're the correct fit,
B: if they're worn down,
and C: if the springs and the copper braid are equal.

Thanks Bob, for another motor learning experience :)

Cheers
Tom
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Re: Useful resource for motor brushes

Postby 9fingers » 11 Jul 2019, 16:28

Brush motors are always noisy, not due to brushes but related to the the obscene armature speed, the amount of air required to cool them and their open frame construction. I can guarantee that you wont hear brush noise over the rest of the racket from them.
Their big advantage is power to size ratio compared to an induction motor and cheapness for portable tools but for aural sanity stick to induction motors.

Bob

Information on induction motors here
https://drive.google.com/file/d/0B_GZrX ... sp=sharing
Email:motors@minchin.org.uk
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Re: Useful resource for motor brushes

Postby TomTrees » 11 Jul 2019, 17:44

Thanks Bob
Good to know this stuff, albeit disappointing to read. :(

Maybe there's some chance I will turn the machine into a sander, but it's definitely not on the...
"to do someday" list now.
I might hold onto the idea, if I ever need to do something with it, that might fit the bill, but an angle grinder is so much more compact, and probably just as capable for most applications that I foresee.

Once again, many thanks for schooling me on motors of all kinds.
I guess I have gotten a taste for induction motors, and might look for a wee induction motor if the need arises.

Regards
Tom
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