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Thread: Giant micrometer - GIF

  1. #1
    Jon
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    Supporting Member jimfols's Avatar
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    Recon what the resolution is, 0.500 inch?

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    Supporting Member McDesign's Avatar
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    Yeah - that can't really be called a "micro"meter - maybe just "meter".
    It's like the optical engineer I used to work beside, with a wooden yardstick he claimed was calibrated "in wavelengths of light".

    Forrest

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    Supporting Member jimfols's Avatar
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    "in wavelengths of light"

    I would have had to ask the engineer 'what color'.
    Jim

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    Supporting Member McDesign's Avatar
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    Ah - we worked with lighting LEDs, so 450 nM - "royal blue".

    All illumination LEDs actually make light at this wavelength, and are coated with phosphor to absorb some portion of this wavelength, and reradiate it at a variety of longer wavelengths, or colors. Our eye mixes all this together as various degrees of "white". There are a couple of boutique LED makers that use a 405 nM "pump" to get some more energy in the near UV area.


    He was a smarter guy (a couple Masters degrees as well), but I think I have more patents.

    That's better, right?

    Forrest

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    old kodger's Tools
    Depending upon how "stiff" the arc framework is the resolution might be a lot less than .5". I wouldn't be surprised to find it down to nearer 10 or 20 thou.
    The problem is at what time of day he seems to be measuring steel, and the gi-crometer looks like aluminium coefficients of expansion would play havoc with that
    I suppose it could be made of titanium.

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    Supporting Member Paul Alciatore's Avatar
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    Mechanical clocks (and electronic ones for that matter) can be compensated for temperature changes. Why couldn't the frame of a micrometer also be?
    Paul A.

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    Supporting Member suther51's Avatar
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    It may have to.be calibrated often, perhaps multiple times a day. The extra long "dumb" anvil might play a part here as a way to efficiently calibrate. Just a guess

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    maybe even recalibrated before every use

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    Jon
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    Large measuring instruments. Westinghouse Electric Corporation. 1910.

    Fullsize image: https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg




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