Question

Use of determining the pitch of a screw gauge.

Answer 1

Let us first know about screw gauge. A screw gauge is the ideal instrument for measuring spherical or cylindrical objects precisely. Untrained hands may find it difficult to operate an exceptionally fine-tuned screw gauge. The goal of this essay is to teach anybody and everyone how to use a screw gauge properly.

Complete step-by-step solution:
A micrometre, also known as a micrometre screw gauge, is a device with a calibrated screw that is widely used in mechanical engineering and machining, as well as most mechanical trades, along with other meteorological instruments such as dial, vernier, and digital callipers, for accurate measurement of components. Calipers are commonly used as micrometres, but this is not always the case (opposing ends joined by a frame). The object to be measured is positioned between the spindle and the anvil, which is a highly precisely machined screw. The spindle is moved by rotating the ratchet knob or thimble until both the spindle and the anvil barely touch the thing to be measured.
In every screw gauge, there are two parameters that are employed. They are the screw gauge's pitch and least count.
Pitch: The distance travelled by the spindle per revolution is measured by sliding the head scale over the pitch scale in order to complete one full rotation of the screw gauge.
Least count: The screw's least count is defined as the distance travelled by the screw's tip when it is spun through one division of the head scale.

Note: Micrometers are also used to measure the apparent diameter of celestial bodies or microscopic objects in telescopes and microscopes. William Gascoigne, an English astronomer, devised the micrometre for use with telescopes around $1638$.