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Thread: Bore clock

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

    Bore clock

    I made this about 40 years go from a Model Engineer article before digital calipers became so affordable. Overall it works very well, it has a range of 3/8 to 2 inches. The slightly awkward part is transferring the reference to a micrometer it being a bit of a juggle to hold both items at once, the answer of course is to use a micrometer stand (my next project). Over the years I have gained some bore mikes to make this a bit redundant. Personally I find telescopic bore gauges just as good to use but this seemed like a good idea at the time like so many things.

    Bore clock-4.jpg

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    Carnel (08-15-2020), jimfols (08-14-2020), Jon (08-20-2020)

  3. #2
    Supporting Member mklotz's Avatar
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    mklotz's Tools
    Having made a similar device...

    Simplifying the measurement of bores

    I'm interested in how yours operates. Am I correct in assuming that the small knurled screw pivots the movable measuring arm, said movement recorded on the dial indicator (here in the colonies "clocks" tell time) ? Then the micrometer is applied to the measuring points and adjusted until the DI reading is duplicated at which point the micrometer reflects the bore diameter ?
    Regards, Marv

    Home Shop Freeware

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    Carnel (08-15-2020)

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    Thanks olderdan! We've added your Bore Clock to our Measuring and Marking category,
    as well as to your builder page: olderdan's Homemade Tools. Your receipt:

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