Re: Clarification RE: drilling techniques for plastic to get specific sized hole?

Lloyd,

To really help, we need to know EXACTLY what type of plastic it is.

But first, drilling will not make a round hole. This may be your
problem, or part of it. Second, yes, freezing uhmw can help when
machining. Third, try boring, or in the absense of being able to do
that, at least reaming the hole to size. And don't forget that
even "slippery plastics often benefit from lubrication.

Hope this helps.

Ballendo

P.S. Does it pull out one direction easier than the other? (or push
through easier than to pull back out? There may be ridges from the
lips of the drill, making a nice "one way" set of "fingers" in the
hole (like a porcupine quill). Or you may be pulling off axis, and it
is binding. Try clamping the rod, and moving the plastic block on and
off.

--- In CAD_CAM_EDM_DRO@y..., "Lloyd Leung" <lloyd@l...> wrote:
> Sorry,
>
> I want the hole just large enough, so I can slide the rod in and
out,
> but without much play at all...
>
> The hole is large enough for the rod to be *push* in... VERY hard
to put
> the rod out afterwards...
>
> This is probably due to heat expansion of the plastic while
drilling...
>
> Should I be using a large drill? Freezing or heating the plastic?
>
> The plastic is 1 1/2" x 1 1/2" that I'm trying to drill...
>
>
> -----Original Message-----
> From: Lloyd Leung [mailto:lloyd@l...]
> Sent: Thursday, January 31, 2002 11:48 PM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] drilling techniques for plastic to get
> specific sized hole?
>
> 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@L...
>
>
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