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Thread: Hole center spacing gage

  1. #1
    Supporting Member mklotz's Avatar
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    Hole center spacing gage

    Finding the center-to-center distance between two holes can be done a number of ways but this tool simplifies the process. The two arms are slid along the rods until the conical points seat in the holes. Then calipers are used to measure across the flats milled at the top of the arms.


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    Last edited by mklotz; 07-08-2017 at 10:08 AM.
    ---
    Regards, Marv


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  2. The Following 9 Users Say Thank You to mklotz For This Useful Post:

    H.L (10-05-2015), high-side (12-14-2019), kbalch (10-02-2015), morsa (10-05-2015), Paul Jones (10-02-2015), PJs (10-04-2015), rendoman (11-07-2017), thehomeengineer (01-16-2018), Toolmaker51 (04-08-2018)

  3. #2
    Supporting Member Vernon's Avatar
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    Will say the work is very nice
    Last edited by Vernon; 10-02-2015 at 04:37 PM.

  4. #3
    Supporting Member C-Bag's Avatar
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    Knowing Marv's incredible work, I would bet those silver looking plugs at the other end are replaceable and or different size for any hole.

  5. #4
    Supporting Member Vernon's Avatar
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    Quote Originally Posted by C-Bag View Post
    Knowing Marv's incredible work, I would bet those silver looking plugs at the other end are replaceable and or different size for any hole.
    The points should do any size only issue is a bigger hole would need to go down to center up that would be hard with to fixed rods

  6. #5
    Supporting Member mklotz's Avatar
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    You're both correct.

    The conical tips are replaceable. I never made a selection of tips for this version because I built a larger version that has several sizes of cones that can be mounted to rods that can slide up and down on carriers that ride on a single rod. Their up-down sliding degree-of -freedom solves the problem of different sized holes. This version was for a job where the holes were all about the same size.

    For holes of different diameter there's a method using only calipers that will give very good, but not precision, results. Measure across the hole edges using the outside jaws. Call this measurement A. Measure across the hole edges using the inside jaws. Call this measurement B. Average the two measurements and that is the distance between the hole centers. Proof...

    D = distance between hole centers
    R1 = radius of first hole
    R2 = radius of second hole

    then:

    A = D - R1 - R2
    B = D + R1 + R1

    A + B = 2*D

    So

    D = (A + B)/2
    the average of the two measurements.

    For really precision measurements, put gage pins in the holes and use this method on the pins.
    ---
    Regards, Marv


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  7. #6
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    Thanks mklotz! We've added your Hole Center Spacing Gauge to our Measuring and Marking category, as well as to your builder page: mklotz's Homemade Tools. Your receipt:


  8. #7
    Supporting Member Christophe Mineau's Avatar
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    Hi Marv,
    It seems I missed this one, this is really a great idea !
    Thanks for sharing !
    Christophe
    Cheers !
    Christophe
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  9. #8
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by Christophe Mineau View Post
    Hi Marv,
    It seems I missed this one, this is really a great idea !
    Thanks for sharing !
    Christophe
    Thanks, Christophe. I'm pleased that you like it.

    It's very easy to make a version of this for laying out equally spaced holes along a line. Simply make the steel tips a bit longer and sharper. Dial in the correct spacing by using calipers across the half cut-aways. Set one tip on a starting point, align second tip to reference line and tap with a small hammer. Step and repeat.
    ---
    Regards, Marv


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  10. #9
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    Some times the simple things come out and you ask yourself, " Why Didn't I Think of That" Great Job.

  11. #10
    Supporting Member high-side's Avatar
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    Nice looking tool. Do the arms have the tendency to twist much?


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