drilling perspex

[spatz]

although done before I would rather be safe, what is best for drilling the perspex material, a sharp new drill or a rater used one ?

thanks

[UltimaCH]

Start by making a small hole and work you way up with different drill bits until you reach the desired diameter. Don't rush and go slowly.

Here's a video of making a biggish hole in a thick plastic. It seems you can cool the drill bit with water if needed.
http://www.youtube.com/watch?v=hM_DR3t4mjI

[Corsair613]

When I did the canopy on my airplane (a very tense operation), I used dedicated plexiglass drill bits. They've got a different flute profile from standard bits and, supposedly, are less prone to catching in the material and starting cracks.

For example: Plexiglass Drill Bits

Ken

[F.C.]

Use an old blunt drill bit, a new bit will grab and may cause splintering or even cracks.
I have a box of well worn bits for this type of work.

[DHGTR]

i used a blunt drill for my windows

[UltimaCH]

A used drill bit makes sense.

[Storer]

If you haven't got a blunt bit the best thing is to drill into a bit of concrete first with your new bit (just a little way) to take the edge off.

Better to burn through than start a crack.


Paul

[spatz]

thanks a lot thought that a well used drill might be a good idea and I have plenty.....