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SImon, I just realized that using the between-centers boring bar, it'll be difficult to use a plug gauge as you intended. Have you an idea for gauging the diameter?
Or make a ring gauge that will fit over the bar to speed things up,...
Bringing an OD to size is pretty easy...in the home shop....but the same is not true on the ID. I tend to make the bore first, and then fit the OD after. Then if it's .001" over...no big deal.I adjust the piston, or the tailstock quill to suite.