Intro to Millwright 2025 – 400 Free Practice Questions to Pass the Exam

The claim that the measuring increments on the sleeve of a depth micrometer read the same as those on an outside or inside micrometer sleeve is false. Depth micrometers are specifically designed for measuring the depth of holes or the height of small objects, while outside and inside micrometers are tailored for measuring external and internal dimensions, respectively.

The main difference lies in how measurements are taken and what is being measured. Depth micrometers typically have a stem and a measuring base that provides depth measurement from the surface to an internal step or bottom. The increments on the sleeve of a depth micrometer are meant for reading these depth measurements and often have more one-to-one correspondence with the depth being measured compared to the outer diameters measured with outside micrometers or the inner diameters of inside micrometers.

Thus, the increment markings on the sleeves of these tools are calibrated for different purposes and should not be considered interchangeable. Understanding this distinction is crucial for achieving accurate measurements in various machining tasks.