Re: [CAD_CAM_EDM_DRO] Active damping

In a message dated 1/18/01 4:42:23 PM Hawaiian Standard Time,
leswatts@... writes:

<< I may try a tube in tube construction on the next one with
urethane or polymer concrete poured in the interstitial spaces.
Some good work has been done on this and it makes a welded steel structure
that is very well damped but still light-
the steel tubing is still mostly air inside. >>

Les,

Exactly what brand or kind of concrete would that be? Where would one find
some? I have some 3" square 1/4" wall tubing that is resonating as part of a
column on a small mill. I'd like to try the polymer concrete.

Peter
THRD, Inc.