[TheForge] Motor brushes

[Bob Willman]

	I suspect that the wires are molded/cast with the carbon material in
a mold. 


Bob Willman
Bowling Green, Ohio
The Eagle's Anvil
WB8NQW

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bruce Freeman
Sent: Sunday, April 01, 2007 6:44 PM
To: Sponsored by ABANA
Subject: RE: [TheForge] Motor brushes

I've seen some brushes that contain no wire.  If it can make friction
contact with the armiture, it can make friction contact with line voltage.
Usually there's a spring to make the actual contact, IIRC.

However, I just pulled a brush out of a throwaway angle grinder and found
that it is an assembly:  A carbon brush with a wire soldered to a thin metal
disk, the wire surrounded by a spring.  Interestingly, the wire comes out of
a hole in the carbon brush.  How is it attached?  No evidence of solder.

So, I asked myself how I would construct this.  I don't know if solder would
stick to a carbon brush, and I doubt it.  However, drill a hole maybe 1/4 in
deep, insert wire, and  pack hole with lead  wool and I bet you'd have a
working brush.  Might want to dip the lead wool in vinegar first to give it
a clean surface.  Maybe some other packing would work as well.
 In a pinch, I might try very fine steel wool, also cleaned first.  I can't
say these ideas would work, as I've never tried them.

Bruce
NJ
--- Dan Brewer <danqualman at gmail.com> wrote:

> The wire is part of the brush. 
> 
> You will need to find new brushes.
> 
> Dan in Auburn
> 
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net 
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Lynn and Susan 
> Lang
> Sent: Sunday, April 01, 2007 2:53 PM
> To: theforge at mailman.qth.net
> Subject: [TheForge] Motor brushes
> 
> Hello
> How does the brush manufacturer connect the fine copper wire to the 
> carbon brush?
> I have repaired the forge blower motor brush, soldering the wire back 
> onto the brush, do not know if a good fix or not. Am in pursuit of a 
> new pair of brushes.
> 
> It appears that maybe copper flakes are embedded into the end of the 
> brush, or it could just be copper from the wire that I pulled out...
> 
> Or is a different repair method better? 
> 
> Thank you
> lynn
> 
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