So, I'm trying to make feet that will isolate a turntable from vibrations. I'll be printing it. My question is, I need sprints that will support a turntable thats about 12 pounds. I don't need much travel. I was thinking about springs from a drum brake hardware kit. Any other ideas? Where else can I buy springs?
I think I want between 16 and 24 springs (need a multiple of 4).
Rc car coilover springs?
Sure you don't want some kind of polymer spring? That way it has better internal damping.
(rubber, is what I mean)
alfadriver wrote: Sure you don't want some kind of polymer spring? That way it has better internal damping. (rubber, is what I mean)
Hmmmm. Interesting idea. Where would one secure some of this magic stuff?
Cut up an old mountain bike shock?
mndsm wrote: Cut up an old mountain bike shock?
Or I've seen rubber bushings that have a thread on one side in good hardware stores.
McMaster carr?
http://www.mcmaster.com/#compression-springs/=y208ze
http://www.mcmaster.com/#vibration-damping-sandwich-mounts/=y20afa
Make your own set of these from some roll cage tubing, washing machine feet and hardware store springs. You can even cheat on fabricating the center nut by destroying two yard sale spoked bicycle front wheels.
These can support a tube amp... and say they are good for 100lbs using all 4. So 12lbs won't be a problem at all.
What frequency are the vibrations?
I dont know. I'm doing this as a surprise for somebody. It's foot falls, so low frequencies. that's why I need very little travel.
DrBoost wrote: I dont know. I'm doing this as a surprise for somebody. It's foot falls, so low frequencies. that's why I need very little travel.
So, 0 to 5Hz ought to cover you.
If you want to experiment, you can try using hose and a couple bolts:
Or get more creative using rubber sheet cut into circles. Sandwich the outside edge between two pieces of flat stock and put a bolt with washers through the center. Picture a flat rubber washer held on the outside with a bolt through the middle, or a homemade version of this:
You can vary the stiffness by changing the thickness of the material, how tight you stretch it, or changing the size of the washers and hole in the flat stock.
We used rubber shock mounts for our antiquated avionics boxes in the EA6b Prowler. Something like this
We would order them from supply and they'd come in different weight ratings etc. It's been a long time so I'm afraid I don't have a part number or anything to go by...
DrBoost wrote: Where else can I buy springs?
Hardware stores, farm supply stores.
Depending on the application, lengths of rubber hose can also make a good spring, and have some self-damping characteristics.
Giant Purple Snorklewacker wrote:DrBoost wrote: I dont know. I'm doing this as a surprise for somebody. It's foot falls, so low frequencies. that's why I need very little travel.So, 0 to 5Hz ought to cover you.
Lower frequencies are a longer wavelength, thus requiring more travel - although amplitude is also a factor. An old-school Hi-Fi nut friend of mine just hangs his turntable from the ceiling. Is that an option?
What you're trying to accomplish is "floating" the turntable. In essence you're looking for are feet that are calibrated to the exact weight of the turntable/LP. Imagine adding a 1-lb weight onto the turntable/LP - that would cause the feet to compress completely vs. removing 1-lb which would leave the feet fully extended. Since the weight of the turntable + LP is going to be pretty consistent, it should be easy to achieve once you know the exact weight.
Very small bicycle innertube?
Magnets
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