Re: (ET) Brush issue...

["Christopher Zach" <czach computer org>]

Personally, I had the same problem with one of my small diameter motors. 
The
brush appeared to be "hung up" on the metal brush holder (stamped metal)

In addition to tapping the brush, I also went and slightly widened the
holder and flared the edges a *tiny* bit. Think very small changes.

My guess is the brush holder is a wee bit tight, and as a result natural
motor vibrations will cause the brush to migrate away from the armature.
Kind of like it ratcheting out. Opening up the holder a smidgen prevents it
from ratcheting.

HTH
Chris

----- Original Message -----
From: "Elie, Larry (L.D.)" <lelie ford com>
To: <elec-trak cosmos phy tufts edu>
Sent: Tuesday, May 28, 2002 1:20 PM
Subject: (ET) Brush issue...


> You would think I had seen it all.  Nope.
>
> One of my large diameter deck motors quit spinning.  I poped the cover,
> unbolted the casting that holds the brushes and found a brush not
touching.
> The brush itself was not badly worn, and the springs seemed good.  A tap
> poped the brush out where it belonged, and I re-assembled.  It mowed 
> fine,
> for a few hours, then I had a repeat.  It isn't working now, and I'm not
> sure what the 'fix' is.  The graphite of the brush should be fine for a
> lubricant, and everything seems to be sliding properly.  Any suggestions?
>
> Larry Elie
>