Re: [CAD_CAM_EDM_DRO] drilling techniques for plastic to get specificsized hole?

Finally my 2 cent.
We were talking about UHMW and certainly on the kind of UHMW I used to
work with the reamer would be the worst tool to use.
If at all a highly sharpened special plastic or Aluminium mill will get
results using it with compressed air and circulating the size of the
hole. And still You will have to fight with some thousands of shrinking.
if you need precision holes. Boring will work only with a very sharp
toolbit (20 to 30°chissel angle)
If not you get again the Murphey effect.
Have fun!
Sven Peter

Raymond Heckert wrote:

>
> One last suggestion before we close the lid... Try to hand-sharpen the
> drill bit with one lip longer than the other (i.e. the vee-center is then
> "off-center"), then the drill will make oversized holes, even in plastic,
> (if the bit is long enough to flex several "tenths"). Anyways it sure works
> in soft metals. Also, DON'T make a pilot hole, it will defeat your
> purpose.
>
> Best of luck, Ray Heckert
>
> ----------
> > From: Lloyd Leung <lloyd@...>
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] drilling techniques for plastic to get
> specific sized hole?
> > Date: Thursday, January 31, 2002 8:47 PM
> >
> > I have either, UMHW, Polyethylene, or something like cutting boards.
> >
> > I'd like to know the technique for drilling plastic.
> >
> > I want a 1/2" hole... however, when I slide it over my 1/2" precision
> > ground rod, the hole is too small...
> >
> >
> >
> > --
> > Lloyd Leung
> > Lloyd@...
> >
> >
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