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Thread: Miniature center finder

  1. #1
    Supporting Member mklotz's Avatar
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    mklotz's Tools

    Miniature center finder

    When I built my tensegrity model...

    Miniature tensegrity table

    I had to find the center of the sides of a number of 1/4" square pieces.

    My homemade center finder...

    Large scale center finder

    is too big and clumsy for such small pieces so I decided to make a QAD (Quick And Dirty) tiny center finder...

    Miniature center finder-center-finder-1.jpg

    The body is a coffee stirrer. I drilled a 1.5 mm hole in the center to accept the tip of a 0.5 mm mechanical drafting pencil. Using a compass centered in this hole, I laid out arcs on each side of the stirrer to establish the spacing of the pins. After that it was just a matter of lopping some pins from a small dowel and gluing them on the stirrer at points marked by the arcs. The spacing between the pins affects how close to the end of the stock the center finder can be used. If that is a concern, the spacing should be only slightly larger than the width of the stock.

    In use...

    Miniature center finder-center-finder-2.jpg

    the device is twisted on the stock until the pins touch the sides which puts the hole in the middle of the stock. A pencil marks the stock through the hole. Drawing the device along the stock makes a line if that is desired.

    The take-away here is not so much the device but the method of construction. Not as accurate as my use of a DI to lay out the holes on my metal version but plenty accurate enough for woodworking.

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  2. The Following 3 Users Say Thank You to mklotz For This Useful Post:

    old_toolmaker (Jun 22, 2021), Paul Jones (Jun 22, 2021), Toolmaker51 (Jun 21, 2021)

  3. #2
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    Thanks mklotz! We've added your Miniature Center Finder to our Measuring and Marking category,
    as well as to your builder page: mklotz's Homemade Tools. Your receipt:




  4. #3
    Supporting Member Toolmaker51's Avatar
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    Toolmaker51's Tools
    "The spacing between the pins affects how close to the end of the stock the center finder can be used. If that is a concern, the spacing should be only slightly larger than the width of the stock.
    ........the device is twisted on the stock until the pins touch the sides which puts the hole in the middle of the stock. A pencil marks the stock through the hole. Drawing the device along the stock makes a line if that is desired.

    The take-away here is not so much the device but the method of construction. Not as accurate as my use of a DI to lay out the holes on my metal version but plenty accurate enough for woodworking.
    "

    This is standard for Mr. K and a limited number of folks, wish it was more universal.
    It's not easy to visualize without prior experimentation and some failures. Increasing that ratio depends on observation and suitable records. Like many tools, applicable to various types of work.
    BTW, the tool is seen on different workbenches too. First I saw, a gunsmith used it centering sighting beads on a shotgun rib.



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    Toolmaker51
    ...we'll learn more by wandering than searching...

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