Re: [CAD_CAM_EDM_DRO] Re: vibration damping materials

At 08:32 AM 1/27/03 -0500, you wrote:

>the heck is that? Well, I will try to avoid reams of math here and simply
>say that the forces needed to deflect the damping material need to be
>of the same magnitude as the forces needed to similarly deflect the
>structure.

Sorry, but it's just not so. For example, boring bars can be damped by
filling with mercury. Or they can be damped by filling with lead or steel
shot. Or, I damp them as needed by strapping on a few tool bits with rubber
bands.

If the damping material has the same stiffness as the structure, it will
resonate at similar frequencies, which really adds up to no damping at all.

What does matter is getting good coupling between the structure and the
damping material, IE overall contact or bonding between.

Regards, Hoyt McKagen


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