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Dial Bore Gauge Innards?

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DavidA:
The three point versions are often more accurately called Bore Comparators.

Much used in the engine re-boring industry.

Dave.

BillTodd:
If it has a DTI mounted then it'll require a <45 degree wedge (so the legs can push the expander back) .

Since a comparator does not usually require the linearity of a measuring device , levers or rollers could also be used

The complication is usually how to keep all the bits from falling apart . The mechanism is rarely complicated.

Hopefully, this time it'll send: this picture is another wedge design for a bore gauge:


[edit] This is a diy version using balls
http://rick.sparber.org/4bidg.pdf

sparky961:
Thanks.  That's good enough to confirm for me that there's no black magic going on inside.  I like the DIY version but geeez.... did you have to give me another project to get done?! ;)

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