Posted by Jim.ME on December 19, 2020 at 13:05:21 from (67.242.178.40):
In Reply to: Micrometer reading 101 posted by svcummins on December 18, 2020 at 13:28:20:
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Thank you for clearing this up, the small marks are each 1/2 thousandth as I thought. The packaging may say graduated in .001" but the thimble of the one you have is graduated on .0005" increments. So your reading that started this was about .6985", .0015 less than .700. The angle of your picture may be throwing that reading off a bit as compared to looking at it square on, in hand.
As for the .010" difference between the caliper and mic, it could be several things; calibrations may be off, piece you were measuring might be out of round, operator "feel" was likely different, changing temperature, for somethings. Even the temperature from your hand can make a difference. The calibration shop I take things to won't do a calibration until the tool sets in their lab for 24 hours so it is the same temp as the calibration gear.
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