"Martin" wrote in message
. ..
I'm trying to make a special gasket out high density foam rubber.
Actually I'm using a kid's 4oz practice hockey puck as the blank. It's 1"
thick and I need to make a 1" hole in it's center. Does anyone know of
type of bit or other type of cutter that would make a clean cut. The
common bits and step bits just rip it up.

Foam does not drill easily. It can be cut using a smaller diameter end mill
in a drill press and moving the foam around it to make the hole.

You may want to try a brad point or forstner bit as it will cut the sides
better than a twist drill. You can also try sandwiching the rubber between
two pieces of wood and drill through the whole thing. That will work well
for thin materials, but I'm not sure about 1" thick.