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Thread: Hole diameter gage

  1. #1
    Supporting Member mklotz's Avatar
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    Aug 2015
    LA, CA, USA
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    mklotz's Tools

    Hole diameter gage

    Before I broke down and bought a set of pin gages, I made this tool for measuring the diameter of holes too small for split-ball gages.

    It consists of two parts: a housing with a lock screw and a tapered measuring gage with a cut away section that, in concert with the lock screw, prevents the measuring rod from falling out and damaging the slightly fragile tapered rod.

    In use, the tool is calibrated by sliding the taper into a hole of known diameter and measuring the projection of the rod from the top of the body. With this reference point it's then just a simple bit of math to obtain the diameter of an unknown hole.

    Yes, I knew full well when I made it that it could be fooled by a bell-mouthed hole. It was only used for non-critical measurements. I knew that I would eventually buy pin gages and I did.

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    Last edited by mklotz; Jul 5, 2017 at 04:25 PM.
    Regards, Marv

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  2. The Following 4 Users Say Thank You to mklotz For This Useful Post:

    Jon (Aug 29, 2015), kbalch (Aug 31, 2015), Paul Jones (Aug 29, 2015), PJs (Aug 31, 2015)

  3. #2
    Supporting Member Christophe Mineau's Avatar
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    Jul 2014
    France, Brittany !
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    Christophe Mineau's Tools
    Great idea !
    Thanks for sharing !

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    Cheers !
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  4. #3
    kbalch's Avatar
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    Jun 2012
    Clermont, FL
    Thanked 531 Times in 383 Posts
    Thanks mklotz! I've added your Hole Diameter Gauge to our Measuring and Marking category, as well as to your builder page: mklotz's Homemade Tools. Your receipt:

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