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Technician Development Program I Practice Exam

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How do you read a metric micrometer to the nearest 0.01 mm?
Correct Answer:
Read the sleeve scale for whole millimeters and tenths; read the thimble scale for hundredths; add both for final measurement
Explanation:
Reading a metric micrometer to 0.01 mm comes from using both scales together. The sleeve provides the larger part of the measurement in millimeters and the tenths, while the thimble adds the remaining hundredths. Because one turn of the spindle moves 0.5 mm and the thimble is divided into 50 parts, each thimble division is 0.01 mm. When you align a line on the thimble with the sleeve, you’re reading the hundredths, and you add that to what you already have on the sleeve (the millimeters and tenths). This combination gives you a measurement accurate to 0.01 mm. Reading only the thimble would miss the larger millimeter part, estimation by feel isn’t precise, and a digital display, when present, isn’t how you interpret the traditional analog scales.

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