Screw Gauge

Understanding Zero Error|Zero Error In A Vernier Caliper|Positive Zero Error|Negative Zero Error|Practice Exercise|Screw Gauge|Pitch Of A Screw Gauge|Least Count Of A Screw Gauge|Principle Of Screw Gauge|Method To Use Screw Gauge|Zero Error In A Screw Gauge|Positive Zero Error|Negative Zero Error|Practice Exercise|Summary

Diagrams show readings of a screw gauge. Figure (i) shows the zero error reading when the screw gauge is closed, figure (ii) the reading when the screw gauge is being used to measure the diameter of a ball-bearing. What is the diameter of the ball-earing ? There are 50 divisions on circular scale.

The pitch of a screw gauge is 1mm and its cap is divided into 100 divisions. When this screw gauge is used to measure the diameter of a wire, then main scale reading is 2 mm and 58^(th) division of circular scale coincides with the main scale. There is no zero error in the screw gage. Then the diameter of the wire is

In a screw gauge, 5 complete rotations of the screw cause if to move a linear distance of 0.25 cm . There are 100 circular scale divisions. The thickness of a wire measured by this screw gauge gives a reading of 4 main scale divisions and 30 circular scale divisions. Assuming negligible zero error, the thickness of the wire is :

The pitch of a screw gauge is 0.5 mm and the number of division on the circular scale is 100. When a glass plate is held between the studs of the screw gauge , the main scale reads 1.5 mm and the 69th division of the circular scale coincides with the index line of the main scale . What is the thickness of the glass plate ?

While measuring diameter of a wire using a screw gauge the main scale reading is 7mm and zero of circular scale is 35 divisions above the reference line. If the screw gauge has a zero error of -0.003cm , the correct diameter of the wire is (given least count =0.001cm )