From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


There are small motors in the surplus places that will do fine.  The ones
you want are the Escap and other instrument motors with a gearbox on them.
These are also known as coreless motors as the armature is a coreless
design that reduces the inertia of the motor.  The voltage is somewhat
unimportant as the power supply can be adjusted to fit.  Even 24v motors
are useful if you ever find any as you will not be running them at full
speed.  Finding gear ratios in the hundreds will be a bit more difficult
but they are out there.
Another version of motors are the ones used to turn pots.  If you find an
ad for a motorized pot then the motor there is good for doing focusing work
and other such things.  I use them for adjusting the mirror stand so that I
don't have to walk down to the other end of the testing bench and upset the
air between.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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