What is the angle through which
the screw has travelled if before one
round is completed the screw is in the
position shown by O'?
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Step-by-step explanation:
As shown in first figure the zero error of the screw gauge is:
ZE=
50
5×0.5
=0.05mm
Least count of circular scale =
50
0.5
=0.01mm
Circular scale reading =25×0.01=0.25mm
Main scale reading =2×0.5=1mm
Actual measurement is =MSR+CSR − ZE =1+0.25−0.05=1.20mm
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