Plastic on aluminum is a great bearing surface. I would recomend UHMW
(Ultra High Melecular wight) plastic. You can purchase it at
www.mcmaster.com and some woodworking stores carry it. Woodworkers
use it for making jigs and fixtures etc.
I used it for the "bearing" surfaces on the way system for my CNC
router, works great and tolerates dust and chips really well.
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> On Thu, 23 Jun 2005 15:52:47 +0200, David McNab <david@r...>
> wrote:
>
> >
> > Can someone recommend better ways to do the tracks, using
inexpensive
> > and easily available materials that don't need specialised tools to
> > deploy? Preferably materials which can be easily sourced in a
small city
> > without 8 hours searching the Yellow Pages?
>
>
> Al on Al is bad, better make plastic on Al or even better plastic on
steel.
>
> ST