Question

In a Screw Gauge, if the zero of the head scale lies below the pitch scale axis, the zero
error is __________.
1. positive
2. negative
3. nil

Answer 1

"In a Screw Gauge, if the zero of the head scale lies below the pitch scale axis, the zero error is negative.

If you point out the zero of the head scale on the index line then you can find the negative error, but if you place the zero at the below line of the scale then you can find the positive error. The formula of this scale is give below:

Corrected Head Scale Reading ( CHSR ) = Head Scale Reading ( HSR ) – Zero Error(along with their positiveor negative sign)

"