One of the most accurate ways to measure a bore is with a dial bore gage, but these can be really expensive and seldom used tools. A nice Mitutoyo dial bore gage set is almost $400 as I write this.
I loved this gadget by gbritnell I saw on HMEM to adapt a DTI to the task:
Snap gages are cheap, but take a lot of “touch” to be accurate. Dial bore gages are one of the best tools for bores, but they’re costly. These guys fall somewhere in the middle, but closer to the dial bore gage. They’ll need to be calibrated against a reference, but once that’s done, they’ll be quick and easy to use.
Dial bore gage…
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Bob is responsible for the development and implementation of the popular G-Wizard CNC Software. Bob is also the founder of CNCCookbook, the largest CNC-related blog on the Internet.