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Question

The following diagram shows part of a screw gauge. What is the reading?


  1. 1.80 mm

  2. 1.83 mm

  3. 1.86 mm

  4. 1.89 mm


Solution

The correct option is C

1.86 mm


First part of the measurement, P.S.R = 1.5 mm

Head scale division that coincides with the pitch scale axis, H.S.C = 36

Second part of the measurement, H.S.C × L.C = 36 × 0.01 mm = 0.36 mm

Measurement with zero error = P.S.R + H.S.C × L.C = 1.5 + 0.36 = 1.86 mm

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