So we’re trying to measure a round hole with a square block![]()
So we’re trying to measure a round hole with a square block![]()
When I know I'll be boring several same-sized holes I make a tapered plug gage, then use my outside calipers (or mike) to mark it with the location of the ID I'm shooting for. It doesn't take much time or material to make one. Two marks for your acceptable min/max ID and you have a go/no-go tester. I'm talking a Sharpie mark, not scribe lines, so there won't be raised edges from the scribing.
Thanks for that Abom79's suggestionIt's something you get a feel for. I can work to a couple of thou with decent verniers, tenths with snap gauges. Did take me a while to get good technique, though.
If you want some pointers on excellent snap gauge technique, look at some of Abom79's old videos on YouTube.
Once you get good technique, it's really hard to not be accurate and quick with snaps, but I applaud the ingenuity with the blocks!