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Thread: Drill guide question

  1. #1
    Engineer chassis's Avatar
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    Default Drill guide question

    I'm installing a new lockset on the main entry door of the house. I need to drill 2 new through holes, one for a mounting screw and one for the interior turnpiece. I'm changing out an old Baldwin piece for a new one.

    Question is how to ensure I drill the hole square/perpedicular to the door. I prefer to drill the hole with the door on its hinges, because the beast is solid mahogany and it ain't light.

    Am I making much ado about nothing? On one hand I want the holes to be perfectly square to the door surface. On the other hand, no one will see the holes, and if I mess up a little bit, I can make them a tad bigger and it really won't matter as far as I can see.

    Another question on which drill bit to use. One hole is 5/16" and the other is 5/8". Which bit is best for this - forstner, spade or regular twist drill? Thanks.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    A forstner bit is nice, but overkill. On mahogany, I wouldn't use a spade bit. A spur point bit or a twist drill (if sharp) would work. If you clamp a piece of plywood over where you want to drill, you should minimize chips. A forstner bit is nice, but you can burn one up if you aren't keeping it even and loading up one point. It would be a waste to ruin one. Drill a pilot hole through using a smaller bit,and use the bigger one from both sides to prevent chips.

    A small square held up near the bit helps you keep things level and square. It helps to have a a second person to judge the other orientations.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

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    You can rent a clamp on drill guide for a hand drill that will set the angle perfectly. There are also a million door lockset jigs out there. I gotta believe you can find one at some rental center.
    Last edited by prashster; 09-01-2006 at 08:02 PM.
    (important note: I'm not a pro)

  4. #4
    Engineer chassis's Avatar
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    Well I got the job done. I used the drill guide for two of the three holes. It worked pretty good, but in retrospect I probably could have done without it.

    I used a brad point drill, and a forstner bit to drill the holes. Both worked great.

    Here's a couple pics of the setup. I used 2 bar clamps to clamp the guide to the door.
    Attached Images Attached Images   

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