Re: ATM 'Frozen' liquid mirrors

[andyman@tiac.net (andyman)]

Hello Peter,
It may be, that the rotor in your motor is unbalenced.  Balenced electrical
motors are an unnecessary expense, in potters wheels.  If you balence it,
retrofit with silicon nitride bearings, true and align the pulleys, you
should be better off.  Otherwise, I need a potters wheel  <smile>

-Andy


<snip>

I rewired the speed controller in
>the foot paddle and replaced the variable resistor with a fixed
>one to keep the speed constant.  Still had problems
>with vibrations despite putting everything in a sandbox as my
>laser holography friends suggested.  I am not sure whether the
>problem is due to inadequate damping from the ground or a worn
>bearing in the motor drive. Probably both. 

<snip>