Re: contact probes

Brian thanks for the help. While my machine is a metal frame, the bed
is replaceable mdf. I have tried the mist before and it make the
table life a good bit shorter, especially in the immediate area of
the mist. You did jog my memory though about cooling and I have a
venturi type vacuum that I might be able to pipe the exaust down to
the cutter and send some super cooled air there. I think that is how
the venturi works.

Mike

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "BRIAN FOLEY" <ka1bbg@...>
wrote:

>
> Hi, have you tried water or milk as a coolant? even if just a

mister might

> keep it cool enough? cul brian f.
> ----- Original Message -----
> From: "guzakaka" <nonna01@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Saturday, June 03, 2006 4:52 PM
> Subject: [CAD_CAM_EDM_DRO] 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
> > >
> >
> >
> >
> >
> >
> >
> >
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