Question

The diagram below part of a micro meter screw gauge what is the reading shown? Assuming the pitch is 0.5 mm

• A. 4.05 mm
• B. 4.51 mm
• C. 5.00 mm
• D. 6.666 mm

Answer 1

The correct option is A 4.05 mm

$L\cdot c=\text{pitch}$

$\begin{array}{c}=\frac{0.5}{20}\\ =\frac{5}{200}\\ =\frac{2.5}{100}\\ =0.025mm\end{array}$

$\text{Final reading}=MSR+CSR$

$\begin{array}{c}=4+2\times L\cdot C\\ =4+2\times 0.025\\ =4+0.05\\ =4.05mm\end{array}$