Beastie

[Lee Roberts]

When i say "secret", i mean more "surprise".

I must say that when I read your comment, I did interpret that to mean "I'm not ready to show yet, you'll have to wait and see", given your contributions previously.

I left excited to see what you have come up with, as a solution for a machine :).

.Me

[cropwell]

Further up this thread there is mention of sand or epoxy filling the frame. Is this a naive question, but would foam filling (that evil stuff in a spray can, that builders use) give enough resonance damping to be useful ?

Rob

[mekanik]

Hi Rob
I wouldn't think so, you are looking for a dense mass, foam is light and full of gas.
Mike

[cropwell]

I wouldn't think so, you are looking for a dense mass, foam is light and full of gas.

My thought was that the closed cell structure of the foam would act as damping. I know that traditional thinking for acoustic damping is to add mass, but nowadays there must be some material that would act as an vibration absorbing foam. I must get some of this foam and fill a metre length of 50x50x3 box section to see the effect on ringing. I'll bet it would f**k up a set of tubular bells

Rob

[mekanik]

You could be right Rob, i seem to recall something on the forum about damping, will have a look in my Docs to see if i can find it.

[mekanik]

Rob
Have a look here
http://solutions.3m.com.sg/wps/porta...beNVTNM5RSXLgl

[cropwell]

Hi Mike,

This is the stuff used for sound deadening on car panels and the like. My friend has a garage and uses Dynamat. It is expensive.

I am looking at the weight aspects and also it is fairly easy to squirt this sort of stuff http://www.screwfix.com/p/no-nonsens...ld-750ml/45865 into a box section.

When I get to it, it wouldn't hurt to fill the gantry and frame, especially if you put in plastic tubes to run wiring. I am really looking to find out if anyone has already tried it.

Rob