My apologies to those who are content not (rpt not) to know how things work and who have distain for physics beyond the high school level and who have never heard of Einstein, Heisenberg, Thorne, Schrodinger, Hawking, Wheeler, Feynman, Marconi, Bohm, Bohr, Fermi, Teller, Oppenheimer and who admire audio tweak reviewers who conclude their review with the disclaimer, "I have no idea how this thing works but works it does."
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Oh, one more thing. Perhaps nothing is more well understood than gravity. At least by those who wrote the book and those who read the book, one hopes anyway. The book I'm referring to is Gravitation, published 44 years ago.
Gravitation is a physics book on Einstein's theory of gravity, written by Charles W. Misner, Kip S. Thorne, and John Archibald Wheeler and originally published by W. H. Freeman and Company in 1973. Owing to its prominence, it is frequently abbreviated MTW after its authors' initials. The book, which has more than 1200 pages, resembles a large telephone book in size and shape. The cover illustration, drawn by Kenneth Gwin, is a line drawing of an apple with cuts in the skin to show geodesics. It contains 10 parts and 44 chapters, each beginning with a quotation. The bibliography has a long list of original sources and other notable books in the field. The level of the book is advanced, with the intended audience at the graduate-level and above.
cheerios
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By the way, my spring based isolation systems like all spring based isolation systems are in fact anti gravity devices. If you go and measure the weight of the object on the top plate of a spring based system you'll find it weighs quite a bit less than it would just sitting on the table or whatever.
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jollygreenaudiophile
Well Jeff since it sounds like you were absent at class for quite some time while I was learning.
And since your comments are beginning to make you look silly. And of course because you "obviously" know, please explain what gravity is....
Especially since we do not even have a completed theory "of" gravity let alone a complete model..
>>>>You don’t, anyway. I’d be careful about speaking of everyone else if I were you.
As the best known of the four fundamental forces "gravity" seems to be thought of as basic science and easily explainable by most people. It is not. Einstein’s calculations seemed to lead to gravity being the "warping of space time", but we don’t know what it is or the why of it.
>>>>>Again, just because you don’t know or because you can’t explain it it’s best not (rpt not) to assume no one else does or can. Hint - gravity is the weakest force.
ALL work done with gravity calculations is like working with "Ohm’s Law", which of course is no ’law", at all, is it Jeff? Or did you solve that all by your lonesome as well?
>>>>Whatever.
I don’t come here to argue. I come here to learn.
>>>>>>>Why start now? I have come here to bury Ceasar not to praise him.
Besides, without gravities effects my turntable wouldn’t even exist! Would it? But maybe if I could modulate the gravitational pull at the center point of the music groove I could......................
>>>>>Whatever. Psssst, the word you’re looking for is "gravity’s."
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Poor, Robert. A lost little sheep. That's what happens when you follow the wrong sheep. In your case, Mr. Michael Green. Like peas and carrots. It's like he's right here. 😀
🐐 🐐 🐐 🚶
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It's pretty obvious you must've spent waaay too much time at NASA. Oh, well, have you given any consideration to like a refresher course on physics or anything?
Education cn be defined as what's left after you subtract what you forgot from school. ~ Old audiophile expression
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jollygreenaudiophile2
Uh huh, You mean the "Big boy's", whom still cannot decide whether gravity is actually a wave or particle "effect",? Let alone prove it? And there's a guy in the corner shouting, "It's the wave effect (on) particles!", Those guys?
Huh?! Gravity is neither a wave or particle. A gravity wave is simply a manifestation of gravity. I trust you don't think waves in water are particles.
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If using sequenced high mass layers was effective I’m pretty sure the LIGO project to detect gravity waves would have used them. What they did use, in fact, was sequenced mass on spring layers. The advantage to bluestone and granite for DIY audiophiles is low cost and effectiveness, due to high mass and stiffness. That’s why the big boys like Newport and other isolation platform manufacturers use large granite slabs for the top plate of their larger isolation platforms. Very low frequency seismic type vibrations, the most harmful ones, the ones that excite 😛 turntable natural frequencies circa 10 Hz to 15 Hz cannot (rpt cannot) be addressed without mechanical low pass filters of some sort. Performance of mass on spring systems is all about high mass and low spring rate. It’s rocket science.
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Decoupling and coupling is not rocket science. The coupling is for draining off medium and high frequency induced or residual vibration from the component/system. The decoupling is for attenuating very low frequency seismic type vibration transmitted from the floor to the component. Since no single mass on spring layer is a perfect isolator (i.e., low pass filter) you can cheat a little by building two mass-on-spring layers, separated in resonant frequency Fr so they won’t interfere with each other. This usually means using high mass in the construction of the dual layer stack - e.g., slabs of granite or bluestone.The high mass ensures a very low resonant frequency for the bottom layer. Then the top layer is a snap.
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Butcher block is OK if done right. A big factor is how the butcher block is mounted and how the component is mounted on the butcher block. Not to mention what the butcher block is mounted on.
But there really is no substitute for real (rpt real) isolation which means, of course, mass-on-spring devices. Mass per se is good in the sense of inertia (i.e., resistance to external forces) and for mass-on-spring devices for which mass per se lowers resonant frequency Fr of the iso device, thus improving isolation effectiveness. The thicker the butcher block the better the system resist bending forces since it's stiffer. That would explain the populaity of 3-inch thick butcher blocks. Finally, the best results will be obtained by careful decoupling and coupling techniques, since both are necessary.
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My new iso stand is somewhat similar only I use a bed of teeny tiny glass microspheres that are almost perfectly round. The "action" is much better with the glass microspheres, you betcha. I also use a large glass tile and springs and diamond hardness cones. Oh, my! I’d post a pic except it’s proprietary. This iso stand simulates the head of a woodpecker that can withstand shock and vibration that accompany decelerations around 1000 g whilst pecking at 20 pecks/second that would otherwise kill it. I call it the Woody the Woodpecker Stand.
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