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In Reply to: RE: Calling all mechanical engineers - lever problem ... :-)) posted by stehno on October 09, 2014 at 00:48:05
In a vacuum chamber there is still the Earth's crust vibration to consider, that affects the object in the vacuum, whether it be optics or whatever. That is why isolation is necessary in a vacuum and also necessary outside a vacuum - to reduce seismic vibration. Your example of footfall affecting the stereo cartridge stylus demonstrates my point quite well, actually. No one is saying acoustic vibration should NOT also be addressed. Or the internal induced vibration, unless you believe motor noise and transformer noise are good things. If you are so enamored of vibration I suggest you consider putting the whole thing up on a shaker table.
Edits: 10/09/14 10/09/14Follow Ups:
Geoff, as you've established so clearly to me at linkedin forums, IMO, you're little more than a fabulous speculator always pretending to speak from firsthand experience and knowledge that seems to require only a brief time between posts to realize your speculations this month contradict and void last month's statements of fact.
Just wish I would have recognized it sooner so I wouldn't have wasted so much time engaging in meaningful monologue.
BTW, contrary to popular folklore, the footfall as you call it from my 400 lbs. spouse 2-stepping example is referring to shock and impact which has nothing directly to do with proper vibration control. Though shock and impact will eventually result in subsequent vibrations, but leave it to you to speculate that the ensuing vibrations and not the shock and impact caused the needle to jump 14 grooves.
Your example of a shaker table is nearly as preposterous and gives clear evidence to me that as usual you lack discernment and your logic is unreasonable. Hence, your probable use of a sledgehammer and a Sherman Williams paint can shaker when performing all your "high-end" audio vibration controlling R&D as you seek to convert all that unwanted violent energy to harmless heat.
You might give some serious consideration to spending time in the library boning up on the pros and cons of mass on spring isoaltion systems. You might also bone up on seismic vibration and microseismic vibration while you're at it. It wasn't that long ago most of my customers had Rockport turntables, the one that's 60 grand, then dollars. Those are the ones that come with dedicated airspring isolation systems. My own nimbus is almost 20 years old and still the best performing airspring platform, by far.Cheers, Geoff
Edits: 10/10/14 10/10/14
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