[78-L] Turntable vibration isolation

[Don Cox]

On 03/08/2010, Ron L'Herault wrote:
> I think the material you are looking for is Sorbothane. You can make
> feet from it and rest the turntable on them. ISTR units with the
> sorbothane on each end of springs that actually supported the TT. An
> alternative, as someone mentioned is a slab of concrete or marble.
> I'll bet one can find a marble cheese board or dough rolling board.
> The trick is to cut tennis balls in half and use the halves as "feet",
> under the corners of the marble/concrete pad, on which you would place
> the turntable. The design is one I've read about for minimizing
> vibrations getting to scientific balances and microscopes.
> 
Bear in mind that it is not just springs (whether metal or rubber) that
you want, but springs combined with mass.

The aim is to get a resonant frequency which is below all the disturbing
frequencies and is also well damped.

Rubber damps itself, but one could also use thick oil in a dashpot with
metal springs.

Regards
-- 
Don Cox
doncox at enterprise.net