In this week's Weekend Handyman tool-tip segment, host Paul Ryan has some handy tips on drilling.
- If you need to enlarge a hole, for example, putting a new lock set on a door. The best way to get an accurate-size hole is to use two hole saws on one arbor. You'll need one smaller hole saw the size of the original hole and a larger hole saw the size of the new hole (figure A).
Install the two hole saws, the small inside the large one. The small one should protrude at least a 1/2" beyond the larger one. Insert the smaller saw into the old hole, and carefully guide the saw through the hole. Keep the drill on a straight, steady course as the larger saw cuts the new hole around it. - Let's say you have to drill through something like a metal-clad door. A teeth and hole saw are made to cut through that tough material, but it can dull the teeth of the saw. Also, the heat that is generated can discolor the material.
The solution is to lubricate the saw as you go. It's easy. Use a sponge! Sandwich a sponge between a couple of boards -- pegboard on the top works well. Use the saw to cut through (figure B) the sponge. Lift the saw and remove the sponge from within and soak the sponge plug in water, cutting fluid or machine oil. Push the sponge plug back onto the saw (figure C), and the lubricant will seep from the sponge and lubricate the saw -- keeping the saw cooler.
RESOURCES :
Plunge Router (Porter Cable)
Porter-Cable Corporation
Website: www.porter-cable.com
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