The optimum cutting speed for maximum production is (‘n’ is tool constant and ‘Tc ’ is time required to change the tool)

A

$$\frac{k}{\left[\left\{\frac{1}{n} + 1\right\} Tc\right]^{\frac{n}{2}}}$$

B

$$\frac{k}{\left[\left\{\frac{1}{n} - 1\right\} Tc\right]^{n}}$$

C

$$\frac{k}{\left[\left\{1 - \frac{1}{n}\right\} Tc\right]^{2n}}$$

D

$$\frac{k}{\left[\left\{\frac{1}{n} - 1\right\} \frac{Tc}{2}\right]^{n}}$$