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

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 
  To: SAC Forum 
  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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