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Mitutoyo post style backplate for dial indicator

petertha

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#1
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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talvare

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#2
Could possibly be used in a chuck or collet for sweeping inside of a shallow bore ?

Ted
 

Matthew Gregory

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#3
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...
 

francist

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#4
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
 

4gsr

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#5
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.
 

kd4gij

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#8
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.
 
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