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I see you are a mfr ...

Posted by andyr (M) on October 9, 2014 at 19:33:53

In Reply to: RE: Calling all mechanical engineers - lever problem ... :-)) posted by stehno on October 9, 2014 at 00:48:05:

of rack systems.

That might explain why you have displayed little knowledge of TTs? :-))

Linn (and others) use 3 springs not because they are convinced they can "defy the laws of physics and isolate an object from all sources of vibration simultaneously " but because they feel a sprung TT does not suffer from problems which solid-plinth TTs do.

Those mfrs who make non-sprung TTs rely on some kind of isolation devices to make their TT work well (eg, Vibraplanes, Minus Ks etc.) - not so much against footfalls caused by 400 lb spouses boogie-ing right in front of the turntable but from terrestrial vibrations, such as trains which are adjacent to the building structure. I would suspect that doing as you suggest (replace the springs with some hardwood or better yet metal blocks and then place your massloading weight on it) would produce such problems - however, it is easy enough for me to try this experiment. :-))

Linn (and the other suspended TTs) use springs - or in SME's case, rubber O-rings - to prevent these vibrations from getting to the stylus. AIUI, they only work down to (in Linn's case) about 5Hz - so there still may be a need for some other isolation device down to 1 or 2 Hz - depending on your surroundings.

Re. your comment "Finding the correct formula is moot" ... I find that very strange. :-)) It seems to me the springs will bounce better if the total weight of bearing/platter and 2 arms is shared equally across the 3 springs - rather than, say, the weight being 50% on one, 30% on another and 20% on the 3rd.

Thanks to the help I received here from Bill and Todd, I have been able to slightly adjust the position of the bearing which now - according to my calculations - gives me almost exactly equal loading, when the weight & position of the arms are also taken into account. I will post on this, soon.


Regards,

Andy

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