DIY Network

How to Enlarge a Hole Using a Drill

Weekend Handyman host Paul Ryan offers some handy tips on drilling and demonstrates how to enlarge a hole using two hole saws on one arbor.

More in Home Improvement

  • Time

    1 hour

  • Price Range

    $1 - $50

  • Difficulty

    Easy

Highlights:

Step 1: Connect Two Hole Saws

To enlarge a hole for a project such as 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. Use one smaller hole saw the size of the original hole and a larger hole saw the size of the new hole.

Install the two hole saws, the small inside the large one. The small one should protrude at least 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.

use two hole saws on one arbor to enlarge hole

Step 2: Attach a Sponge to the Saw

A teeth and hole saw is made to cut through tough material such as a metal-clad door, but doing so 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 the sponge.

attach sponge to saw

Step 3: Wet 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, and the lubricant will seep from the sponge and lubricate the saw -- keeping the saw cooler.

soak the sponge plug

Was this project helpful?

Don't forget: Read comments and leave your own

Advertisement

Projects

COMMENT ON THIS PROJECT

    

Sign in

All fields are required.

E-mail Address:

Password:

Remember me on this computer

Signing in

Please enter your email address and we will send your password

E-mail Address

Your password has been sent and should arrive in your mailbox very soon.

Not a member?

Sign up with DIY Network to share tips with other do-it-yourselfers and comment and ask questions on projects.

It's free and easy.