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[ATM] Treadmill Motors

I have been toying with the idea of building my first grinding machine
employing one or two motors.
 
I have two family members who work for a treadmill manufacturer and they
can get me treadmill motors at cost.  I am curious to find out if
anybody has any experience with these and knows of any problems that I
may encounter.
 
Since I can get the motors from the factory I have a wide range to
choose from.
 
The low end motors are ~ $10 and the factory has to add a cooling fan
and the pulley.
 
On the high end I can get the motor from a health club machine that
produces 3 HP and can run a treadmill up to 12 MPH (no idea on the motor
rpm).  I can pick up one of these with the controller, transformer, and
the pulley already attached for $75.
 
I am leaning toward one of the higher end motors since they are intended
for more frequent use.  Is there any disadvantage in overpowering the
grinding machine?
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