RE: [CAD_CAM_EDM_DRO] Re: Al Extrusion Vibration Damping

Hi Alex,

The spring would have to be quite stiff or as you say will set up another
source of oscillation , but it will Add much needed length to the resonant
rod.

Roger (UK)

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Alex Holden
Sent: 16 June 2005 20:10
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Al Extrusion Vibration Damping

On 16 Jun 2005, at 19:56, Roger Hampson wrote:
> The problem you are all overlooking is that the aluminium extrusion is
> oscillating by adding oil, water, and soggy teddy bears is not going
> to remove the energy in the oscillation.
> The best method is to put a 1/4 wavelength stub at the point of
> maximum oscillation, something like a stiff spring a length of stiff
> wire and adjust a weight that you can slide up and down the rod, at
> some point of both length and weight the oscillation will stop!!

I think you've got it the wrong way around. Adding a spring won't remove a
significant amount of energy, it'll just alter the resonant frequency of the
system. Adding a damper will absorb energy. I really don't know how much
damping you will get from filling the frame with water or oil, but soggy
teddy bears sound like a good idea to me ;)

--
------------ Alex Holden - http://www.alexholden.net/ ------------ If it
doesn't work, you're not hitting it with a big enough hammer



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