If you have ever drilled acrylic with a standard twist drill you've probably noticed that it is less than ideal. The angle is too shallow and the drill bit tends to break out the backside and chip the material. Here is an easy way to put a much steeper angle on the bit that leaves both flutes the same length (on center) and gives you a ridiculously sharp edge (where it counts).
- I am about to show you a few things that are definately not safe / OSHA approved.
Try this at your own risk.
If you blow up a grinding wheel or burn yourself or in any other way damage yourself, anyone else or your tools or equipment, you've been WARNED!!!
So anyone who feels like leaving safety related comments, please leave them only if you have a safer way of doing this. I already know it is dangerous.
That being said...On to the show!
Step 1: Tools needed...
The drill bit you want sharpened (of course)
A small (high speed preferably) electric hand drill
A bench or pedestal grinder
Step 5: Pull the trigger and...
Run the electric hand drill up to high speed, stablize the rotating chuck with your left hand and apply LIGHT pressure.
(I know, I know. Grabbing a rotating chuck with your hand might not be best / safest set-up on the planet, but it works)
Step 6: Finishing touches
Finish sharpeneing the bit by applying VERY, VERY LIGHT PRESSURE. You should only see minimal sparks. This is taking the high point of the drill bit and turning it into a cutting edge.