# Math

posted by Mary

Using a metric micrometer caliper to measure the thickness of a plate, we found that graduation line 4 is visible on the sleeve, one additional 0.5 mm is visible in the sleeve, line 4 on the thimble coincides with the reading line on the sleeve. What is the measured thickness of the plate?

I know that:

Since the pitch of the spindle screw is one-half millimeter (0.5 mm), one revolution of the thimble advances the spindle toward or away from the anvil the same 0.5 mm distance.

The reading line on the sleeve is graduated in millimeters (0.1 mm) with every fifth millimeter being numbered from 0 to 25. Each millimeter is also divided in half (0.5 mm), and it requires two revolutions of the thimble to advance the spindle of 1.0 mm.

To read the micrometer, add the number of millimeters and half-millimeters visible on the sleeve to the number of hundredths of a millimeter indicated by the thimble graduation which coincides with the reading on the sleeve.

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