Re: Drilling Tufnol
I would suggest a 30mm hole saw, of the type that has a central drill bit projecting from it. This stabilizes the rotational axis of the saw and avoids the need to clamp the material, but if you can clamp it in the drill press all the better. These saws work well just with a hand electric drill too.
Once the bit passes through the panel I would cut about 2mm or so into one surface and then flip it over and cut the full thickness hole. Otherwise one edge can be rough, but it might not matter if you plan to machine that away later. Do it slowly with the occasional rest as this thick material can evolve a lot of heat if you try to pass the hole saw through it too quickly.
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