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Home / Tutorials / How to Enlarge a Hole Saw Hole

How to Enlarge a Hole Saw Hole

John P.

July 19, 2016 By John P.

Today I was met with a bit of an engineering challenge. I had a hole that was about 1.5″ in diameter, and I needed it to be more like 2.5″. Normally I’d make a hole either of these sizes with a hole saw. But a hole saw relies on the fact that you can use a center bit to stabilize the blade as it spins around. It is impossible to drill the hole without the center bit, and you can’t use the center bit if there is already a hole bigger than the bit! What to do?!?

Use a Proper Tool

It just so happens there is a tool called the Oops Pilot Arbor that is designed specifically for this purpose. It lets you put TWO hole saws together. You use the original size saw to steady the drill, and the larger one follows.

oops Pilot Arbor

There is also the Craftsman Professional Hole Enlarger Kit. It does the same thing.

Sears Dual Arbor

The John P. Method

Since I didn’t have one of those tools, and was unwilling to wait, I used a piece of scrap wood instead.

First, using your hole saw with the larger size hole you want, make a hole.

Drill Hole in Scrap

Next, screw that hole into the wood that you want to enlarge from somewhere it won’t matter. Like underneath…

Mount the Hole Guide

Finally, you can get down there and feed your hole saw right through it to make your cut!

Drill It

Done.

Hope that helps out! Drop a comment if you found it useful. :-)

Related

Filed Under: Tools, Tutorials Tagged With: How-To, Tools, Tutorials

About John P.

John P. is a former CEO, former TV Show Host, and the Founder and Wizard behind Texas Metal Works. You can find him on Twitter, Facebook and LinkedIn. Feel free to send shoutouts, insults, and praise. Or Money. Money is good.

Comments

  1. Michael Moffatt says

    August 26, 2016 at 4:41 pm

    I wish I would’ve know about this a year or so ago! Great idea.

  2. CL says

    August 8, 2016 at 5:06 am

    Very detailed. Thanks

  3. john deninger says

    July 24, 2016 at 5:27 pm

    that is a great idea john, also i didnt realize they made an enlarger kit thanks for the info

  4. rj says

    July 20, 2016 at 10:46 am

    Similar concept using the “hole” instead of the wood scrap. Saves having to use screws and damage to the finished piece. http://www.finehomebuilding.com/2004/05/01/expanding-circular-holes-easily

  5. JOHN POZADZIDES,SR says

    July 20, 2016 at 9:16 am

    VERY, VERY USEFUL!!!!

  6. MotorBeam says

    July 20, 2016 at 7:56 am

    This video is life changing

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