# how to find zero error in screwgauge.................................?

Kishorkumar
101 Points
6 years ago
Zero error in Screw gauge can be found by the following method :
first take the screw gauge and move it i decreasing order along the index line until it gets tight.At that point if there is any error in the Screw gauge,we can find there because if there is any error the zero on the head (rotating ) scale does not coincide with the index line when the head scale edge is sharply at the zero of the pitch scale .If the zero of the head scale is above the index line then the error is negative ,if the zero is below the index line then the error is positive .
then by the formula

I hope You understood.........!
Shaik mehamood
38 Points
6 years ago
In this micrometer has zero error
There can be two types of zero errors in a micrometer reading
1.Positive zero error
Happens when the zero of the circular/auxilary scale places below the zero of the meter scale reading
2.Negative zero error
Happens when the zero of the circular/auxilary scale places above the zero of the meter scale reading