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I just noticed the Solid Tech Feet of Silence in a magazine ad, and I think I can make it out of wood and other parts (metal bolts, extension springs). Also I think I could incorporate HipJoints in the interior of the Feet. It looks like it's pretty easy to order extension springs rated to a specific Spring Constant (the amount of force required to extend the spring a certain distance).
What I don't know how to do is determine what spring constants I need for the three springs that go into each Foot, so that I can tune each Foot for a particular weight. In other words, how do I determine the spring constant of the three individual springs if I know my target "total" spring constant for the Foot as a whole.
Also, I don't know how to determine what the appropriate "total" spring constant of each Foot should be if I know how much weight it is meant to support. This is probably a function of some kind of target resonant frequency?
Any ideas would be much appreciated. Thanks much!
May the bridges we burn light our way....
Follow Ups:
Before you spend money and time try these: google "Park Supply of America" and enter part # 'DIVMP2C' in the search window. These suckers sell for $25 for 4 @ Mapleshadestore.com. And they work!! They sell for .34 cents at Park Supply!! (you have to double stack them, so 68 cents). I have the mapleshade ones too. Actually, it's a great website to visit.
+1
I ordered 20 of them the other day for .29 apiece!
They are identical in every way to the Mapleshade ones that I have had for years.
If you have a heavy piece of gear (over 20 lbs) you will need to double them up - stack them.
Note: These units have not been tuned by ear like the Mapleshade units, so you'll have to "tune" them yourself......That's a joke.
Meat; It's the right thing to do. Romans 14:2
Wow, I got screwed. Just paid 34 cents each for mine.
Geesh....I got screwed! I paid 34 cents. I have the Mapleshade ones too. If you want the black ones, you'll have to buy a black magic marker.
Good tip about the black marker (laughing).
Check out the second paragraph if you want a good chuckle. Jeez that's some deep guano!
I wonder if the HVAC guy that installed the isoblocks under my furnace knows this little "factoid"? I suppose I will eventually have to tune my furnace by ear.
Meat; It's the right thing to do. Romans 14:2
I've seen that recommendation before, but I've not seen an explanation for why a double stack is better. Thanks.
Not sure myself, But I guess if one absorbs vibrations, two till absorb more? Hell, at 34 cents, triple stack them! Mapleshde glues the two together. I know, because I bought a set and one of them separated during shipping and you can see the glue residue. It looks like rubber cement to me.
Holy smokes! Those ARE the things they sell at Mapleshade! What a markup!
My plans include constrained layer damping, using layers of different materials (a la Symposium shelves), so I'll be doing something similar to those bits. However, I also wanted to add a sprung suspension to the system, and the Feet Of Silence seem to be the most effective way to do so.
Here's my design:
The equipment rack's vertical uprights will be made up of layers of differing woods (Baltic birch ply and different species of hard woods) stacked. I may or may not include a threaded rod inside the whole length of each vertical upright, to compress the glued layers together more than gravity and glue alone can do.
At each shelf level, the shelf materials will be another set of layers in each vertical upright, except that those levels will extend into the shelves themselves. I suspect that I will use Baltic birch sandwiched between two layers of clear acrylic. Each shelf will be cut to a curved shape, to add rigidity; and it will have slits routed through it at multiple locations, to help break up standing waves.
Each shelf of the rack will support a floating shelf designed similarly to the Symposium shelves (foam core, mdf, and metal or acrylic). Each such floating shelf will be supported by the DIY Feet of Silence, and each Foot of Silence will incorporate a HipJoint rollerbearing. The equipment will rest on the floating shelves.
Ambitious, but it keeps me off the streets.
May the bridges we burn light our way....
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