Re: glueing teflon and such - anodizing

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "snuffman5994" <parker@m...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> <davemucha@j...> wrote:
>
> > Of course the first question is surface prep. if teflon is a non-
> > stick, how do you get it to stick ?
>
> There is a process we use that is a plasma etch. This enables you

to

> bond teflon.
>
> > am thinking about hard anodizing the aluminum before assembly and
> > need to find out more about surface conditions. Like, does
> anodizing
> > raise the surface and make for a rougher surface ?
> >
>
> Hard anodic coatings actually penetrate the aluminum 50%. So if you
> require a .002" thick hard anodize .001" will penetrate below the
> surface and .001" will be above the surface. The problem you could
> have is on the corners. Make sure you radius the corners to avoid
> plating build up.

Ok, this may be on the fringe of off topic, but the ram Z axis will
be a square aluminum tube, with a sheet of some sort of
plastic/polimer/epoxy/stuff (PPES) and then another square tube
inside. the inner tube will go up and down and the outter tube will
be fixed.

I was hoping to use a pair of tube with 1/8 difference and insert a
couple pieces of 1/16 of the PPES as the bearing surface. then, since
the inner would move, make the inner part hard anodized to decrease
the potential of wear.

This set-up would lend itself to Moglice as the PPES, but that would
require more attention to detail.

It sound like anodizing will raise the surface, decreasing my 1/8
some degree, then whatever adhesive us used, will also decrease the
space even more.

am I asking too much from stock products ?
would I be better off with Moglice or similar ?

Dave