Re: [CAD_CAM_EDM_DRO] Re: real granite machines!

How about making a big steel box and filling it with concrete?

dave engvall wrote:

> Jon Elson wrote:
>
> > I think a granite slab would make a great slide for a machine. Bolting and
> > gluing several slabs together would be a lot easier than making monolithic
> > complex shapes.
>
> Granite has compressive strengths of about 19 Ksi whereas it is easy to cast the desired shapes in concrete you will loose some
> strength.
> Using some of the newer techniques it is possible to get concrete with compressive strengths in the 12 Ksi range. Embedding steel
> in this and providing decent anchors should not be too difficult.
> Likewise one could drill holes in granite and mount components using a filled epoxy to set anchors and maybe come out OK.
> The local tombstone company would seem to be a better source than the lab grade stuff. I have seen 4' x 4' by 1' pieces for a
> couple thou. (Boeing).
> I find the idea of a small masonry based gantry intriguing but hate to think of the energy necessary to accelerate the mass
> involved.
>
> My thinking goes more along the line of an L shape with cast iron ways, etc anchored in masses of concrete. Has anyone tried this?
>
> Dave
>
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