Punch Set

What is the best drill tool for this project?

I have a plastic ball made of of a thin plastic (the hard kind not the bottle kind) I need to make a hole so I can put a tube through it (like a scuba tube) what is the best tool for te job. A regular drill is too small. What do you recommend?

Actually, my suggestion is not to use a drill at all. You run the risk snagging the thin material, causing it to rip apart and ruin your work piece. If you do choose to use a drill, by all means avoid Forstner bits and spade bits. Instead, use a plain twist bit as sharp as you have and just a little smaller than the diameter of the tube you are seating. They come in ALL sizes. I have several hundred, and my largest is one inch. Use a slow speed, and clamp your work piece securely.

So, if I recommend not using a drill, what would I suggest? Depending on the thickness of the material you are dealing with, my choice would be between a punch and a scalpel. A hollow punch:

http://www.harborfreight.com/hand-tools/punches/9-piece-hollow-punch-set-3838.html

would work best if you have access to the back side of your work piece. Back it up with flat piece of scrap wood, CAREFULLY position the punch and hold it securely, then hammer away. This will work best for thinner materials. Once you start hammering, take care not to let the punch move about.

A scalpel (or precision knife):

http://www.harborfreight.com/13-piece-precision-knife-set-32099.html

will work for thicker materials, and would be best if no punch is available in the right size. You might use the tube itself as a template and score the workpiece all around. Then take away the tube and finish the cut on the line you scored, cutting straight up and down and using the very point of the blade. Of course, you'll be careful not to injure the tube as you move the blade around it. Also, take care to cut just INSIDE the line to ensure a good fit.

Burning your hole is still another possibility, but I would fear weakening or destroying the material surrounding the hole.

I hope something works for you. Incidentally, plastic electrical tape will make a good gasket seal if you need to be air or water tight in your project.

Good luck. Hey, it's not a BONG, is it?

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