On 14 November 2011 04:20, Dave <e...@dc9.tzo.com> wrote: > Concrete is fine for compression loads. You can mix 5000 psi concrete > pretty easily. However it has very poor tensile strength. They say > 10-15% of the compressive strength.
This might well not matter in most machine tools, though, as the important thing is stiffness, rather than strength. (has anyone ever seen a broken frame on a lathe or a mill?) 500 psi (to use your quaint units) is probably plenty. Imagine a lathe with a 10" square headstock block. That's going to take 22 tons of cutting force to snap it off. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
