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Saturday, 26 November 2011

MICROMETER - SCREW GAUGE

MICROMETER SCREW GAUGE
Definition: It is an instrument used to measure the distance accurately up to 0.01 mm OR 0.001 cm.

Construction:
A micrometer screw gauge consists of a fine screw of usually I or 0.5 mm pitch, which moves when rotated through a nut. Screw gauge also has a linear scale, which is parallel to the axis of the screw and is known as main scale and a circular scale, which is divided into 100 or 50 divisions.

Pitch of Screw Gauge:
Distance between the two consecutive threads of the linear screw is called pitch.

LEAST COUNT OF THE SCREW GAUGE (L.C.):
Definition: Least count is the minimum measurement that can be measured with the help of screw gauge.

Least Count = Pitch of the screw gauge / No. of divisions on the circular scale



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