Re: vibration damping materials

I've been looking into this problem for my own designs, and have
considered 2 ideas. One is pouring expanding concrete (concrete
mixed with iron powder - as it cures it rusts, expanding slightly to
offset the shrinkage concrete usually has) into the structure, and
the other is the relatively new material called mineral casting -
usually a granite aggregate with an epoxy binder. This generally has
6-8 times the vibration damping of cast iron. I have not been ably
to find a source of the mineral casting though - it seems to be a
large industry process only - not available to the little guy. Maybe
check with a local architect or masonry supply for mixable ideas that
can dampen vibrations in a structure.

Allan

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "jim davies" <jdavies@a...>
wrote:

>
>
> > Hi Tony,
> > From what I've heard (for what that's worth, but having no

first

> > hand experience with it), lead shot, although providing a nice

heavy

> > material will tend to 'pack' over time because of its'
> > relative 'softness'. It remains heavy, but looses the ability to
> > absorb vibration, when 'packed'; it will just transmit it. I have
> > seen bags of lead shot used for temporary dampening purposes

though.

> >
> Leaving the shot in the bags could reduce the amount of packing.

Another

> workaround might be to use the largest size available. Of course,

steel shot

> is now available and is larger in size and harder.