[sac-forum] Re: Electric motor selection for Binocular chair

Some machinists have had good luck adapting lathes and mills to use low-voltage, adjustable rpm DC gearmotors salvaged from exerciser treadmills, which can be found at garage sales pretty cheaply. Surplus Center (Lincoln, Nebraska) on the web, (or see ads in Popular Mechanics), has similar motors. 
http://www.surpluscenter.com/
Herbach and Rademan is another surplus dealer for gearmotors, but more expensive, I think. 

Gene
(17250)

Paul Lind wrote:


Steve,
Does the chair have some sort of ring and pinion gear system? It sounds like it probably needs a gearmotor for low speed and high torque. I purchased a Leeson 1/8 HP gearmotor for my grinding table a couple years ago. I never found these locally. It's intended for variable speed operation and the full-speed operating voltage is 90V, which gives about 80 RPM. I'm very happy with it. Leeson also makes 12 V "low voltage" gearmotors and I will send you their pdf brochure. Paul 

    ----- Original Message -----
    From: Steven Dodder <mailto:sdodder@xxxxxxxxxxx>
    To: SAC Forum <mailto:sac-forum@xxxxxxxxxxxxx>
    Sent: Friday, November 30, 2007 12:57 PM
    Subject: [sac-forum] Electric motor selection for Binocular chair

    Does anyone here know how to select a suitable motor to be used on
    Pierre's binocular chair?  I'd specifically like to know how to
    calculate the torque and rpm's I might need.  Any hints on where I
    might buy the motors locally would be good, too.

    Thanks.

    Steve Dodder
    Director, Stone Haven Observatory
    President Elect, Saguaro Astronomy Club
    sdodder@xxxxxxxxxxx
    Visit my web site at http://www.stargazing.net/Astroman
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