Re: contact probes

Hi Graham,

Not linear but circular. I tried cutting fast but I found the
circular cuts were not round. I tried pre-drilling and then
taking .010" cuts, but at 22,000 rpm I still had plastic sticking to
the bit. It is delrin btw. I slowed the feed down to as low as 10 ipm
with the small cuts but still no good. Yesterday I tried some glass
filled nylon and that was disaster! I have some phenolic impregnated
wood laminate that I may try.

Mike

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "guzakaka" <nonna01@> wrote:
> >
> > Yeah and that would have saved me 296.19435 hrs this last week!;)
> >
> > Actually I have been trying to make one and the drawings would

have

> > been wonderful. I discovered something in this process too. It is
> > hard to cut plastic with a router that has a fixed speed of

22,000

> > rpm when the parts are small. Just can't move the router fast

enough

> > to get the chips out and they begin to melt to the bit.
> >
> > BTW thanks for making the photos available though!
> >
> > Mike
> >
>
> I'm not sure I follow how could a linear movement cause the chips to
> clear? You might want to try a smaller step down, do light cuts and
> you are much less likely to get melting. It also depends on the
> plastic, Delrin machines a bit more like brass than plastic,
> perspex/acrylic is pretty crispy too but some of the chewy plastics
> seem a nightmare.
>
> Graham
>