Re: Digest Number 24

Hi Mike,

Your idea will almost certainly work. When I installed my wood turning
lathe I initially had the same type of problem and so I made a stand out
of two lengths of 6" steel heating pipe with flanges welded onto each
end which I rag bolted to the floor and filled with a weak cement/gravel
slurry
mixture and capped off with a 1 1/2" thick wooden top. The vibrations
disappeared immediately.

Ian

Mike Romine wrote:

> I am using aluminum and steel extrusions and box channel for
> the frame. These hollow members are very underdamped in nature. 2 ways
> to decrease the amplitude of vibrations is to either increase the
> damping coefficient of the material, or increase the mass of the
> system. But, I think I am going to try to fill my
> hollow structural parts with a reinforced polymerized concrete. This
> will make my machine heavy as hell, but should also decrease the
> amplitude of the vibrations radically. I will let you all know how it
> works.

Best wishes

Ian

--

Ian W. Wright LBHI
Sheffield Branch Chairman of the British Horological Institute.
Bandmaster and Euphonium player of the Hathersage Brass Band. UK.
See our homepage at:- http://www.iw63.demon.co.uk/ or
http://www.GeoCities.com/Hollywood/6067/index.html

'Music is the filling of regular time intervals with harmonious
oscillations.'