Re: ATM Truss tube vibrations - cloth jackets

["Dan Robinson" <danrob@efn.org>]

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> From: Peter D. Brooks <pdbrooks@pacbell.net>
> To: Leftfieldstar@aol.com
> Cc: lifedata@vol.com; atm@shore.net
> Subject: Re: ATM Truss tube vibrations - cloth jackets
> Date: Friday, August 17, 2001 7:38 PM
> 
> Leftfieldstar@aol.com wrote:
> > 
> >  Beans would work fine. Excellent at decoupling and dampening. So
is mixed
> > aggregate and sand. If only they could be light in weight.
> 
> Don't know how easy it would be to get any more, but the styrofoam
pellets used
> in the old 'bean bag' chairs are light.  I'd experiment, but my bb
chair is
> deep in some landfill....

I'm new here, and very much a novice, but mechanical things are my
specialty. The rope method sounds good, but I would have gone first
with packing "peanuts", pieces of styrofoam or maybe foam rubber, or
maybe a mixture."Pearlite", volcanic glass, sounds like corners would
wear off and it would get loose. How about "Vermiculite" (expanded
mica crystals?), that stays soft, from gardening stores? But also I
thought it would be good to have a relatively rigid component at the
center. Maybe any of the above packed around a smaller diameter PVC
pipe. Or how about large diameter soda straws packed in fairly tight,
some cut to different lengths so you don't have nodes?

Dan Robinson
Eugene, OR