PDP 8 panels. Feedback
elson at pico-systems.com
Tue Oct 27 11:33:38 CDT 2015
On 10/26/2015 11:38 PM, Chuck Guzis wrote:
> On 10/26/2015 08:54 PM, wulfman wrote:
>> To effectively drill in plastics you need to run the
>> drill press on
>> the highest speed you can and use a freshly sharpened
>> drill bit.
> If this is Perspex/Plexiglas, I've had great results with
> a good sharp Forstner bit in my drill press at medium (say
> 750 RPM) speed and a not-too aggressive feed.. No
> melting, just lots of crumbly shavings. I've done this
> with sizes down to about 1/4", but no smaller. When
> you're almost through the material, turn it over and
> complete the hole from the back side. Very clean edges,
> with no chips at all
The ultimate way to drill holes in Plexi is with an end
mill. It can make a slight chipping when it punches through
the back, so you either need a backstop material or lighten
up the feed a bit just before it goes through. (This of
course requires a center-cutting end mill, I prefer 4-flute
Even better than just plunging an end mill is to use a CNC
mill and a cutter smaller than the required hole diameter.
You use a pocket boring routine, set up for "climb milling"
and after working through the material in several depth
steps just less then the desired diameter, does a finish
pass at full depth to bring it to final hole size. This
takes longer to describe than it actually takes the machine
to perform, and leaves beautiful holes.
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