[TheForge] more on hammer vibration and noise

Wed Oct 22 11:21:07 2003

Andy,

No, I think you have it backwards.  If I understand it correctly, it's
the stiffness (to use lay terminology) that makes cast iron excellent
for damping vibrations, and hence the material of choice for machinery. 
Steel and pure iron don't compare.  I don't know how a soft material
like lead would compare.

I'm thinking that a ceramic might be better, due to it's stiffness, but
it's lower density might mitigate that.

Open a handbook like Mark's and read about cast iron.  The information
is in there in better form than I can convey.

Bruce
NJ

>>> [email protected] 10/21/2003 5:18:09 PM >>>

On Tue, 21 Oct 2003 16:51:19 -0400, Bruce Freeman <[email protected]>

wrote:

> Now, following up on that, cast iron is reliably reputed (Mark's
> Manual, and other sources) to have the best vibration damping
> characteristics of any metal.  (Or is that, 'of any material'?

    Metal.  Probably iron-based material in fact.  I doubt it
    will dampen vibration as well as a metal such as niobium,
    which is very dead, or lead which is even deader.

> Anyone
> know?)  Would that be a better choice than steel in the present case
> (assuming equal cost and availablity)?

    Perhaps, but you would need more of it due to brittleness,
    unless it is malleable cast iron.  I bet a slab of pure
    iron would work well.

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