Question

$\text{A machine operator needs a gauge for checking}$ $\text{the diameter of shaft being machined to diameter}20\begin{array}{c}+0.06\\ -0.04\end{array}mm\text{.}$
$\text{If wear allowance and gauge tolerance are equal to 10\% of work tolerance,}$
$\text{the limit size of NOGO ring gauge with unilateral tolerance is}$

• A. $20\begin{array}{c}-0.04\\ -0.05\end{array}mm$
• B. $20\begin{array}{c}+0.06\\ +0.05\end{array}mm$
• C. $20\begin{array}{c}+0.07\\ +0.06\end{array}mm$
• D. $20\begin{array}{c}-0.03\\ -0.04\end{array}mm$

Answer 1

The correct option is D $20\begin{array}{c}-0.03\\ -0.04\end{array}mm$

No-Go ring gauge = L.L of shaft

= 20- 0.04 mm = 19.96 mm

Work tolerance = 0.10 mm

Guage tolerance = 10% of work tolerance

$=\frac{10}{100}\times 0.10=0.01mm$

$\text{Dimensions of NOT Go gauge}={19.96}^{\begin{array}{c}0.01\\ 0.00\end{array}}mm$

$=20\begin{array}{c}-0.03\\ -0.04\end{array}mm$