Mikrometerskruvemåler

Mikrometerskruvemåler, often shortened to mikrometer, is a precision measuring instrument used to determine small distances with a high degree of accuracy. Its name derives from the micrometer screw thread mechanism that forms the core of its operation. The instrument typically consists of a C-shaped frame, a fixed anvil, a movable spindle, a sleeve with a scale, and a thimble with a finer scale.

The measurement is taken by turning the thimble, which moves the spindle towards or away from the anvil. The spindle is connected to a precisely machined screw thread. As the thimble rotates, the spindle advances or retracts by a known increment corresponding to the thread pitch. The sleeve and thimble are marked with scales that allow the user to read the measurement. The sleeve usually displays main units, while the thimble shows fractions of a unit.

Mikrometers are commonly used in engineering, manufacturing, and scientific research where precise measurements are critical. They are essential for tasks such as measuring the diameter of wires, the thickness of materials, or the dimensions of small parts. Different types of micrometers exist for specific applications, including external micrometers, internal micrometers, and depth micrometers. The accuracy of a mikrometer is typically in the order of thousandths of a millimeter or ten-thousandths of an inch. Regular calibration is necessary to ensure the continued accuracy of the instrument.