Anyone have any suggestions for drilling acrylic blanks? Do I need some plastic bits? How about those colt bits? They look good but there are mixed reviews out there. Sorry to shotgun blast the questions.
Even with the drill press at its lowest setting I've had blanks blow out due to heat build up.
1) never use brad point bits
2) slowest setting on the drill press
3) only advance the bit 1/4 inch into to blank before backing out
4) use WATER -- I have a few syringes I fill with cold water and dribble into the hole, each time I back out the bit I fill it up to the top with more water
You need plenty of paper towels, and there can be a little spray -- but you were wearing your safety glasses anyway, weren't you :yes:
Drilled over 100 acrylics, some guys go over kill with suggestions, literally sharp bit eject frequently, don't need to use water nor take a break, your bit or blank would hear would NOT heat up if you drill slow and eject your chips SIMPLE , brad point bit, never had one crack
Lotsa good suggestions so far. I would only use blanks that are cast acrylic, not extruded. They look the same, but machine differently. I agree, any sharp drill bit will work if used slow. If you have a drifting problem at the start, place the bit to the mark and turn the bit backwards for several turns just to make a starting divot.
Thats the secret go at a slower n steady feed on the drill press I found doing it on the lathe was not that successful unless you have the right chuck jaws to hold your work peace nice n square.
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