Re: (ET) Nope, that wasn't it...

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

Did you recheck the brushes after the re-occurrence?
See if you can rotate the motor by hand while watching the brushes, and see
if the brushes move and stick.

----- Original Message ----- 
From: "RJ Kanary" <rjkanary nauticom net>
To: "Chris Zach" <czach computer org>; "Elec-trak list"
<elec-trak cosmos phy tufts edu>
Sent: Thursday, April 08, 2004 8:27 PM
Subject: Re: (ET) Nope, that wasn't it...


>    Sounds like time to go to an auto- electric shop that has a growler,
and
> find out if the armatures are dead. You could have a chicken/ egg
situation
> here.
>     Did the brushes stick in the guides because of excessive current draw
> due to shorted windings , or was the commutator overheated and damaged 
> due
> to poor brush contact, due to the scenario that I have observed, 
> mentioned
> in my previous post ?
>
> ----- Original Message ----- 
> From: "Chris Zach" <czach computer org>
> To: "Elec-trak list" <elec-trak cosmos phy tufts edu>
> Sent: Thursday, April 08, 2004 9:19 PM
> Subject: (ET) Nope, that wasn't it...
>
>
> > Fired up the motor. Starts, then stops. try to bypass the thermo switch
> > and you get a set of sparks that will burn the end of your screwdriver
> > off...
> >
> > Not the brushes; they are clear. What the heck could cause this? Any 
> > why
> > on two of the three motors? Could the windings have just gone bad at
> > once? Anyone have this happen?
> >
> > Chris
> >
> >
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> >
>
>
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