Re: [TCML] Flywheel Pulley on Treadmill Motor

[Futuret <futuret@xxxxxxx>]

David,

If you can grip the small shaft protrusion, but then also attach a new protrusion
to the outer edge of the pulley, then use a heavy sledgehammer and
iron rod to strike the new pulley protrusion with a heavy sudden blow (tangent
to the pulley and in the correct direction to loosen it), this might loosen 
the pulley.  This method would take advantage of the inertia of the armature.  
I've had good results with this method
in other cases.  To create a protrusion on the edge of the pulley you
could for example drill a hole through the edge of the pulley, and 
attach a large bolt and nut through the hole.  Using this inertia method,
it might not even be necessary to grip the small protrusion at
the opposite end of the shaft.  Probably the motor should be mounted
onto something solid while the sudden blow is applied to the new pulley
protrusion.  

Regards,
John

 

 

 

-----Original Message-----
From: David <drieben@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Jul 31, 2013 11:23 am
Subject: Re: [TCML] Flywheel Pulley on Treadmill Motor


Hi Tim,

Thanks for for your response. Actually, it appears that my flywheel pulley is 
itself female threaded onto the male threads of the motor shaft itself, so 
tapping or pulling it off wouldn't work. There is a small protrusion of the 
shaft from the opposite end of the motor that could possibly gripped with 
locking pliers (visegrips) to secure the shaft while the pulley is unscrewed 
from the working end of the shaft, but I fear the torque required to break the 
pulley free would cause deformation, if not total destruction of the small shaft 
protrusion being held by the locking pliers.

David Rieben 

Sent from my iPhone


> 

>> Hi all,
>> 
>> I was hoping that I could dip into the collective knowledge of this group
>> on my inquiry, as I've never
>> dealt with this before. I have an old treadmill that finally bit the dust
>> (mainly due to the electronic con-
>> trols messing up). Since it's about 10 years old, I figured it wasn't
>> worth the cost and/or effort that it
>> would take to troubleshoot and fix it but I could not resist rescuing that
>> nice 1.5 HP cont. duty, DC
>> drive motor from the landfill. Like many treadmill duty motors, it has a
>> nicely balanced weighted fly-
>> wheel pulley on the drive end of the ~3/8" shaft and I was wondering
>> what's the best way to remove this
>> flywheel with minimal collateral damage to the motor and shaft that it's
>> attached to? I'm wondering if the
>> motor would run too hot even if the flywheel was successfully removed, as
>> the inner side of the flywheel
>> has impeller vains that seem to moving most of the air through the motor
>> and I doubt that there are any
>> impeller fan blades inside the motor housing, due to its relatively small
>> size. In other word, I'm concerned
>> that the motor is only designed to run with the weighted flywheel pulley
>> in place. It looks as if the shaft
>> end may be threaded and the flywheel pulley is simply screwed onto the
>> shaft but I also wonder how
>> much torque it would require to remove it and how one would go about
>> locking down the shaft so the
>> flywheel could be broken free from it? Of course I'm imagining being able
>> to secure a rotory disc to the
>> motor shaft for a possible variable speed ARSG and I had also thought of
>> simply leaving the flywheel in
>> place and drilling holes in it for passing through bolts into matching
>> holes on the garolite rotory disc.
>> However, this would be problematic due to the fanned out impeller vains on
>> the inside, motor-facing
>> side of the flywheel. Not that I have to have a ready made ARSG anytime
>> soon, as I already have a
>> complete one that's working fine in my current big SG driven coil, but I
>> was just wondering how to
>> go about this for possible future reference.
>> 
>> Thanks for any advice,
>> David Rieben
>> _______________________________________________


 
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