Least count of digital micrometer

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Parts of screw gauge Micrometer Screw gauge Parts It consists of a U-shaped metal frame F with a fixed stud A. • The right moveable and R (called Ratchet) is a cylinder type whose other end is called the spindle. • A static linear scale or the main scale (usually in mm) is marked on a cylinder. • The second scale (moveable) is called a circular scale or a cap scale (with 50 or 100 divisions) which is drawn on a cap called thimble ‘T’ fitted over a cylinder. • The circular scale is designed in such a way that one complete rotation of the cap moves it horizontally by 1 mm on the main scale if circular scale cap moves it horizontally by 1 mm on the main scale if circular scale division is 100 and 0.5 mm in the main scale if the circular division is 50. Read more about Working steps to use of Screw Gauge • To Find Pitch of Screw • To Find the Least Count • To Find Zero Error The distance moved by linear scale during one complete rotation is called the pitch of the screw. For a screw gauge of 100 circular division, the pitch is 1 mm. Least count of screw gauge A screw gauge of 100 divisions will move the cap scale along the main scale by 1/100 of mm-0.01 mm. This is the minimum value up to which a screw gauge can measure and is known as its least count. Or it is defined as the ratio between the pitch of the screw and the number of divisions on the circular scale. Micrometer least count formula micrometer screw gauge least count Micrometer least count in mm Least count= L.C= L.C...