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MacD[_2_]

In article , says...

IIRC, the local Plexiglas shop has some drill bits intended for
Plexiglas. They look like high speed steel bits, but they have a smaller
tip angle (sharper point).

Backing the piece with a block of wood is still a good idea.

Having drilled hundreds of holes in Plexiglas over the years, this is the best
way. We used to resharpen our own bits to a much 'pointier' configuration. They
do not take a very big bite and are very controllable and do not grab as they
come through the back.

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MacD