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20/09/2020 1:52 pm
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A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale. The nature of zero error involved and the lest count of the screw gauge, are respectively :
(1) Positive, 0.1 μm
(2) Negative, 2 μm
(3) Positive 10 μm
(4) Positive, 0.1 mm
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20/09/2020 1:54 pm
(3) Positive 10 μm
Explanation:
Circular scale is 4 unit ahead means screw gauge has positive zero error
= 4 × 10 μm = 40 μm
Least count = 0.5/50 = 1/100 mm
= 10 μm