No. 50 Fly Tool Micrometer Caliper



Image From Catalog No. 18

This Micrometer gives correct measurement of fly tool before boring,
thus preventing guess-work.
The tool reads direct-i.e., if the fly tool is raised .0005″, the bar will
bore a hole .001 larger. This is compensated for by having the thimble
graduated in thousandths for each .0005″.
The use of the Slocomb No. 50 eliminates waste and loss of time
by enabling the operator to set the fly tool of a boring bar to a predetermined
size.
When ordering, specify the exact diameter of boring bar to be used.

Image From Catalog No. 18


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Source – eBay