ICSE Class 9 Answered
Which type of error is Present in the screw gauge.
Asked by subhasis6paul2003 | 13 Nov, 2021, 08:34: AM
Expert Answer
Zero Error of a Screw Gauge:
When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
if the zero of the head scale coincides with the pitch scale axis, there is no zero error.
Positive Zero:
Error When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
Positive Zero:
Error When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
if the zero of the head scale lies below the pitch scale axis, the zero error is positive.
For example the 5th division of the head scale coincides with the pitch scale axis, then the zero error ZE is positive.
ZE = +(5×LC),
where LC is least count and the Zero Correction ZC is give as
ZC = ( 5 × LC)
Negative Zero Error:
When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
Negative Zero Error:
When the plane surface of the screw and the opposite plane stud on the frame are brought into contact,
if the Zero of the head scale lies above the pitch scale axis,the zero error is negative.
For example the 5th division coincides with the pitch scale axis, then the zero error ZE is negative and is given by:
ZE=(-5)×LC,
and the Zero Correction ZCis given as
ZC=+( -5 )×LC
Answered by Thiyagarajan K | 13 Nov, 2021, 09:51: AM
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