Calibrating a mitutoyo digital height gauge?
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  1. #1
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    Default Calibrating a mitutoyo digital height gauge?

    I picked up a new granite and mitutoyo 192-656 0-18" Height gauge. I cleaned it well and polished the ways a bit, I'm not sure the age but it's very clean with no abuse. I checked it out with a 4 and 10" mitutoyo ID Mic rod, it is way out of calibration. At 4", it was .004 high. And at 10" it was .0105 high. Can I adjust this at home, is there something mechanical I can service or is it in the encoder?

    Thanks for any input.

    Tom

    uploadfromtaptalk1410047325515.jpg

  2. #2
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    I don't understand calibrating using an 'id mic rod'. Can you post pictures of your setup?

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    Quote Originally Posted by jordan6679 View Post
    I picked up a new granite and mitutoyo 192-656 0-18" Height gauge. I cleaned it well and polished the ways a bit, I'm not sure the age but it's very clean with no abuse. I checked it out with a 4 and 10" mitutoyo ID Mic rod, it is way out of calibration. At 4", it was .004 high. And at 10" it was .0105 high. Can I adjust this at home, is there something mechanical I can service or is it in the encoder?

    Thanks for any input.



    Tom

    uploadfromtaptalk1410047325515.jpg
    On Mits stand alone readers, there are DIP switches on the board to provide correction for linear errors. Perhaps there is a similar feature on your guage head. You need to find the literature for the unit. It will tell all ;-)

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    Quote Originally Posted by helterskelter View Post
    I don't understand calibrating using an 'id mic rod'. Can you post pictures of your setup?
    I simply stood the rods in a v block. I have a 1-12" set of mitutoyo calibration rods.

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    Wow, I never considered that problem (scaling error) for the digital height gages. I've got a two-beam mechanical (the type with separate up and down counters) and that particular problem is one it inherently can't have.

  6. #6
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    That is not a cheap height gage, hard to imagine it being off that much.

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    I tore it to the frame and gave a deep cleaning. The teeth were caked deep with shop grime, I cleaned them out with a brush several times until every tooth was perfect. I reassembled and lubed it with some dry moly lube. Checking calibration with the same 4 and 10" rods, it read the same. The encoder was clean and smooth. Again, at 4" it was .0045 high, at 10" .0105 high. I don't understand where the error is coming from. I didn't see any kind of linear scaling adjustment on the circuit board, but it does have a readout outlet, and possibly another outlet for calibration?

    uploadfromtaptalk1410234401145.jpguploadfromtaptalk1410234415329.jpg

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    I don't think much of your checking rods thinking 123 blocks or jo block stack may be better.
    but with checking the same twice getting same then perhaps OK. and the device is off.

    http://www.mitutoyo.co.jp/eng/suppor...9M_HDS-20C.pdf

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    Here is the output



    uploadfromtaptalk1410234788187.jpg

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    uploadfromtaptalk1410291215148.jpguploadfromtaptalk1410291230806.jpguploadfromtaptalk1410291239410.jpg

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    Perhaps the follow wheel has run over so much crud it is now defective.

    Sure looks like the device is not measuring well.
    Might call Long Island and ask for advice and rebuild price.

    228 : Mitutoyo height gage


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