what do you mean by zero error in screw gauge?How is it accounted for?
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On the thimble there is a circular scale known as head scale which is divided into 50 or 100 equal parts. When the screw is worked, the sleeve moves over the pitch scale. ... When the tip of the screw is in contact with the anvil, usually, the zero of the head scale coincides with the zero of the pitch scale.
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