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Help needed for information on a micrometer

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  • Help needed for information on a micrometer

    There has been a thread on the Model Engineer forum in the UK about an unusual micrometer. Any help on this forum as to how it works and is used would be appreciated.

    https://www.model-engineer.co.uk/for....asp?th=174013
    Last edited by old mart; 07-29-2021, 02:17 PM.

  • #2
    I don't know anything about that mic but what I find unusual is the screw type hinges and hardware they used on a plastic case.

    JL..........

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    • #3
      Looks like a comparator style mic. They all have that rest on them attached to the frame. The graduated part sticking out is probably the indicator. Generally they have to be set/calibrated with an item of known size like a gage block. Then they can be used to check multiple sizes. Best to keep a gage block near your finish size handy if you want to be right on the money so you can check the accuracy from time to time while working.
      Last edited by eKretz; 07-29-2021, 04:12 PM.

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      • #4
        There was a micrometer that included a thing called a “ fiducial indicator” basically replacing the friction thimble with a spring inside so that constant measurement force was guaranteed, I suspect this looks to be a version, it’s pretty though,
        mark

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