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Mitutoyo post style backplate for dial indicator

Discussion in 'METROLOGY - MEASURE, SETUP & FIT' started by petertha, Jan 13, 2017.

  1. petertha

    petertha Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    Just wondering what would be the application for this back plate style? Its a cylindrical post 12.7mm diameter (0.5") either with or without presence of a threaded hole in the end (M6x1 or 1/4-28 UNF).

    I could see if the post was 0.375" diameter like the stem, you could maybe grip the indicator in a different way in a magnetic holder, but what does the 1/2" OD hook up to?
     

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  2. talvare

    talvare United States Ted A H-M Supporter-Premium

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    Could possibly be used in a chuck or collet for sweeping inside of a shallow bore ?

    Ted
     
  3. Matthew Gregory

    Matthew Gregory United States Active User Active Member

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    I just bought a couple of these to convert some lug-back dial indicators to .375". You have to turn them down - they're considered 'in-the-white', and are oversize to accommodate someone needing a different diameter, for whatever reason. Would be nice, however, for them to offer a standard .375" post for this application, though. Being cheap aluminum, there was quite a bit of porosity apparent as I cut them down...
     
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  4. francist

    francist Canada Active User H-M Supporter-Premium

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    That would explain why the Mitutoyo catalogue shows them as "custom". I'm thinking, how can you have a 'custom' part in a catalogue -- that doesn't make sense. But an oversize one to produce a custom one does. Thanks for that explanation.

    -frank
     
  5. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    I've seen inspection fixtures where the post sat down in a c'bore and held in place with a 1/4-28 socket head cap screw from the back side.
     
  6. kd4gij

    kd4gij United States Active User Active Member

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    They are good for the noga bases also.
     
  7. petertha

    petertha Canada H-M Supporter - Premium Content H-M Supporter-Premium

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    My Noga holder is max 0.375" hence the question. Does your Noga have a 0.5"" hole?
     

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  8. kd4gij

    kd4gij United States Active User Active Member

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    I don't have a noga I have a clone. You just turn the pin down to size. My self I just make the backs I want. for a quick just cut a lug off sand flat and put a 3/8 post with a 10-32 screw.
     
    Last edited: Feb 11, 2017
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