Re: (ET) Brush issue...

["Christopher Meier" <mr23 mn rr com>]

Could the brush be expanding just a hair due to heating from the motor
operation?

----- Original Message -----
From: "Christopher Zach" <czach computer org>
To: "Elie, Larry (L.D.)" <lelie ford com>; <elec-trak cosmos phy tufts edu>
Sent: Tuesday, May 28, 2002 12:52 PM
Subject: Re: (ET) Brush issue...


> 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
> >
>