Re: ATM Advice on Drilling Glass

[Will Flor <will@will-flor.com>]

At 09:03 AM 6/24/98 -0500, Jim Fly wrote:
>
>I need some experienced advice on what type of drill (bit) to use and
>technique (rpm's, coolant, etc.) to drill a smooth 1/8" hole through 1/8"
>thick plate glass.

The best results I've had in drilling glass are to use a round-head slotted
bolt in a drill press.  Build up a little rim around the area where you
want the hole and put valve grinding compound (from an auto supply store)
in it, then lower the bolt and start grinding at a relatively low speed.
The result is a beautiful, perfectly formed hole, with an edge that's not
very sharp.  This works on very thick glass as well.  This technique is
(obviously) not very fast.