How to Properly Use a Hole Saw

Techniques for drilling big holes, deep holes and enlarging existing holes.

By Jeff Gorton

From The Family Handyman

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About This Project

Overview and Preparation

Step-by-Step Instructions and Pictures of How to Properly Use a Hole Saw

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Sure Fire Techniques For Drilling Those Tough Big Holes
Spade bits are the tool of choice for drilling holes up to about 1-1/4 in. in diameter for running electrical wiring and other uses. But when it comes to drilling really big holes for locksets or plumbing pipes, reach for a hole saw. A hole saw is a steel cylinder with saw teeth cut into the top edge. Hole saws don’t cut as quickly as large boring bits driven by a pro’s powerful 1/2-in. drill. But boring bits are expensive ($30 plus drill rental). Hole saws, on the other hand, are readily available at hardware stores and home centers for as little as $5 and work with a standard 3/8-in. drill.

Cutting clean holes with hole saws requires a little skill and practice. Here are the key techniques that will make the task safer and give you the best results.

Proper Setup Is Important
Mount the correct-size hole saw in the arbor. If your hole saw has an adjustable center bit, make sure it protrudes past the toothed edge of the saw about 3/8 in.. If the center bit has a flat spot on its shank, align this with the setscrew. Then tighten the setscrew to secure the bit. Finally, tighten the hole saw in the chuck of a corded 3/8-in. variable speed drill. Cordless drills won’t have enough power unless they’re 18 volts or larger.