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Dial Bore Gauge Innards?

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sparky961:
Can anyone tell me how a dial bore gauge works?  I understand how to use it and what's on the outside but how does the motion of the plunger inside the bore get accurately rotated/translated 90 degrees to the affixed dial indicator?

BillTodd:
Essentially, it is a wedge or cone that pushes the three arms out. The return could be handled by either springs or an internal tapered groove.

The angle of the cone and pitch of the micrometer thread are scaled to give diameter on the dial.

sparky961:
Does this not describe an IntriMik/Holtest type of gauge?

BillTodd:

--- Quote from: sparky961 on January 30, 2016, 09:07:08 AM ---Does this not describe an IntriMik/Holtest type of gauge?

--- End quote ---

I don't understand your question  :scratch:

sparky961:
Sorry, you can tell when I'm typing on my phone because my answers don't ramble on like usual. :)

Your description seems more like an Intrimik or Holtest gauge rather than a dial bore gauge.  The primary differences being that the former typically has 3 points of contact in the bore and a rotating thimble to bring them into contact and obtain a direct measurement.  The latter is zeroed to the desired measurement using a standard (setting stand with gauge blocks, micrometer, or similar) and has only 2 points of contact.  The latter is rocked around until the largest measurement is found.  Spring pressure keeps the points in contact with the bore.  The dial shows the difference between the set value and the measured diameter.

I'm thinking that the Dial Bore Gauge operates similarly but that's only me looking at the outside and making an educated guess.  I was looking for confirmation of the more concrete type.

These videos are ONLY for illustrative purposes.  I haven't watched them entirely or validated the content.

Dial Bore Gauge:



Holtest:

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