Explain the procedure for rectifier zero error in screw gauge.
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If the zero of the circular scale is above or below the zero of the main scale , then it is known as zero error in a screw gauge.
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Procedure to rectify zero error.
Explanation:
When the circular scale of the screw gauge is rotated to maximum capacity and if the reference line on the main scale coincides with the zero of the circular scale there is no error on the screw gauge. If the zero on the circular scale is below the reference line then the error is positive.
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