Re: Cast blocks with linear rails?

The miracle polymers I'm familar with are softer than steel and will
lose dimensions quicker. Bearing surfaces should be maximum
hardness. Particles may tend to embed in the thermoplastics,
ultimately rendering their surfaces a quality similar to brake pads
or worse yet, sandpaper. The thermosets might work if you're
willing to replace them often or possibly "pre-embed" them with
hardened particles, such as shot blast beads, and then hone a flat
surface exposing flat hardened faces. Charles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor"
<vrsculptor@h...> wrote:

> Has anyone tried/considered casting blocks with one of the miracle
> polymers instead of using the standard bearing blocks with the
> rectangular linear rails? I see two advantages to this approach,

its

> cheaper and the polymer is probably more immune to contamination.
> I've also found some cheap rail with no blocks.
>
> Any thoughts?
>
> Roger S