The following diagram shows the zero error reading when the screw gauge is closed. What is the zero correction in this case?

– 0.98 mm

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+ 0.98 mm

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– 0.02 mm

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+ 0.02 mm

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Solution

The correct option is C
– 0.02 mm

As the zero of the head scale lies below the pitch scale axis, the zero error is positive.

Zero Error = + (n $\times$ L.C) = + (2 $\times$ L.C) = + (2 $\times$ 0.01) mm = + 0.02 mm

Hence, Zero Correction = – 0.02 mm

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The following diagram shows the zero error reading when the screw gauge is closed. What is the zero correction in this case?

The correct option is C – 0.02 mm As the zero of the head scale lies below the pitch scale axis, the zero error is positive. Zero Error = + (n × L.C) = + (2 × L.C) = + (2 × 0.01) mm = + 0.02 mm Hence, Zero Correction = – 0.02 mm

The correct option is C
– 0.02 mm

As the zero of the head scale lies below the pitch scale axis, the zero error is positive.

Zero Error = + (n $\times$ L.C) = + (2 $\times$ L.C) = + (2 $\times$ 0.01) mm = + 0.02 mm

Hence, Zero Correction = – 0.02 mm