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If you have ever done any drilling of Brass or Titanium you want to sharpen the the flutes of the drill like that. If you haven't you want to flatten the edge so it doesn't grab. Ideal situation would be a drill with coolant holes the length of the drill so you can have coolant right on the tip. I am building a 4 piece mold for WHOI right now out of acrylic and it needed a 1" dia. hole 9" deep, thru. I roughed out the hole with a drill sharpend like stated above and it worked great, although the clarity is not perfect but I will bore to size and polish it hoping for more clarity. You may want to use a squirt bottle of water to keep the temp down and help in cutting.
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Threaded Mode