RE: [CAD_CAM_EDM_DRO] Re: sourcing motion control parts - steel vs aluminum

So does anyone know of a type of steel that can be purchased that is
straight and clean. I know cold roll flat bar is really good stuff, but
what about square tube?

--- Leslie Watts <leswatts@...> wrote:

>
> Hi Hal
>
> I won't quarrel with your figures...they seem about right.
>
> The issue is the definition of specific stiffness...
>
> Steel has about three times the modulus of aluminum, but it is also
> three
> times the density!
>
> Specific stiffness is the ratio of those two parameters, so they are
> about
> the same.
>
> This is true for most alloys, hardened or unhardened.
>
> One way to think of it is an identically dimensioned bar of different
> materials.
>
> The material with the highest specific stiffness will ring with the
> highest
> note when struck.
>
> FYI the highest specific stiffness of the common metals is beryllium.
>
> OK? :)
>
> Les

=====
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