Re: UHMW slides

while most of the list members seem to prefer orthodox linear
bearings there really isnt any reason why plastic slipper bearings
cannot do the job quite well. The method of adjusting them is perhaps
more important, personally I prefer screw adjustment to shims as its
infinetly adjustable. I agree aluminimum extrusion is not the best
choice for ways but it does work. though dont expect 50 years life
from it as it will wear out faster than ferrous metals.

your choices for a hobby machine should work well and be easier and
cheaper to build than the more elaborate machines that many of the
list members build.

Regards
Bob Thomas


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "george_barr"
<george_barr@y...> wrote:

> I have a question. I am building a CNC (hobby) and need it as
> accurate as
> possible. I am using aluminum extrusion from www.8020.net. They
> have these
> linear bearings which uses UHMW instead of ball bearings for

slides.

> These
> slides uses slippery plastic like pads, instead of ball bearings,

to

> glide
> along the aluminum extrusion. Does anyone have any experience

using

> these
> types of slides? They said a shim can be purchased to provide a

more

> exact
> fit with the slide and the extrusion beam.
>
> I don't want to waste my money if these slides are not worth it. I
> plan to
> do PCB (circuit board) work with my cnc so it needs very good
> accuracy.
>
> Any advice or suggestions are appreciated.
>
> Thanks,