Re: machine ways

Ballendo,

What about Moglice? Does that fit into one of the 4 groups of
engineeered plastics or is it a totally different animal?

I don't have first hand experience with the product, but I believe
it's one of the easier way-lining materials to work with. Since it's
a pourable mixture it has advantages over other plastics which might
only be available in sheet, strip, and rod forms.

Doug

--- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:
> Ted,
>
> There are 4 "engineered" plastics commonly used industrially (of
> course, there are thousands; but these 4 groups are prevalent in
> machinery apps)
>
> As the grandaddy, Nylon also needs to be mentioned, as it is
> ubiquitous(means everywhere!). Often it is used in a "filled" way
> (with oil or grease) for bearings and sliding surfaces of many
types.
> Like UHMW, it "grows" and "shrinks".
>
> 1)UHMW PE- (Ultra High Molecular Weight PolyEthylene) Like super-
> duper milk jug plastic. Used a lot in conveyer systems and food
> processing, as it can be sterilised easily. Very tough, slippery,
but
> has a fair amount of movement(size change) due to temperature and
> humidity
>
> 2)PTFE- (PolyTetraFluoroEthylene) also called teflon, VERY soft,
when
> used for linear bearings it is backed up with a harder material and
> used in very thin layers. The slippery-est (lowest friction co-
> efficient) stuff we have so far in commercial quantities.
>
> 3)Acetal- One trade name is Delrin. It is hard and machines
> extremely well.
>
> And finally, the one you were probably referring to:
>
> 4)Turcite- which is a combination of TFE (teflon) and acetal
(delrin).
> It is used as a lining of ways by many CNC and machine mfrs. And
yes,
> it needs GOOD lubrication system(s) for long life. It is also used
to
> make the nuts that drive many of our smaller CNC machines, and they
> need to be properly lubed as well...
>
> http://www.polymerplastics.com/ is one good site for engineering
> plastics information
>
> Hope this helps.
>
> Ballendo
>
> --- In CAD_CAM_EDM_DRO@y..., "Ted Walls" <tiffyted@l...> wrote:
> <snip> Some modern industrial machines use quite a soft plastic
> > bearing material (can't recall
> > its name) for the bearing surfaces which if not well lubricated
> > becomes useless after a very short period.
> >