PDP 8 panels. Feedback

rod rodsmallwood52 at btinternet.com
Tue Oct 27 13:45:12 CDT 2015

OK  Here's my two cents worth.
First put tape across the area.
Make sure it wont take the silk screen printing off.

Get a small drill. A 1mm PCB  drill is a good choice.
Drill through with the drill set to a fast but not too fast speed.
Turn the work over and re-clamp it. open up the hole but don't drill 
right through,
Turn back to the  side you started with and drill right through.

On 27/10/15 16:33, Jon Elson wrote:
> 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 for this.)
> 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.
> Jon

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