Hi Guys,

I've been considering the best way to measure small diameter bores. I know about gauge pins, but I was thinking bores from about 12 mm up to say 25 or 30 mm. Once I've got to 25 mm I can use my M&W inside callipers. But I've nothing that will fit into that gap in sizes.

I've done a drawing of a proposed device that I can use to accurately measure a small bore !

Minature Bore Gauge.png
I have a pair of M&W 3" inch dividers that have very small diameter legs on them, so I thought that it might be a candidate for making a fitting that went onto the legs and be able to be inserted into a bore so that I could measure it using the transfer method, like I do with the external callipers.

I've a number of bits of scrap brass material that I can play around with.

I present the idea here in the hope that it will prove useful and of interest, and maybe collect some thoughts !
Attached Images




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