Re: [ATM] DC Motor for grinding machine question

["Robert Mohr" <rmohr@tiwcorp.com>]

Hi,

I have used DC Speed control on several machines, for many years. It is 
great to be able to vary the speed by simply turning a dial.

Depending on the size glass you are working, 1/3 to 1/2 horse with a 
reduction drive may be enough. My current machine uses a 3/4 horse and a 
60 to 1 reduction. Even at lowest RPM you can't stop the turntable. All have 
used 90VDC motors, as this is a simple setup from 110 AC. I use 
commercial controllers that I have picked up at a local junk yard that 
sometimes gets them. A reasonably priced new unit is made by DART, and 
can be purchased through various industrial suppliers, or ebay. Make sure 
you get a control set for the size motor you are going to use.

One other note, a Permanent Magnet motor is preferred, as the others are 
much louder.

Bob Mohr

> 
> I have a modest sized Draper grinding machine.  It will handle
> mirrors up to 12 inches.  I would like to switch to DC motors
> and have been looking on ebay.  DC motors designed for electric
> scooters seem quite cheap.  One with these specifications is
> currently available:
> 
> 24volt 100watt motor 6 amp, 2500 rpm.  
> 
> I would obviously need a gearbox / pulley system for reduction. 
> Could this motor be used to drive my turntable? Ideally I would
> like to vary speeds between about 3 to 50 rpm.
> 
> Thanks,
> 
> Rod Brackenridge.
> 
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Robert Mohr
Director of Technical Services
TIW Technology, Inc
rmohr@tiwcorp.com
See our web site at www.tiwcorp.com
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