\[U_{s}=\frac{P_{Z} V_{c}}{M R R}=\frac{P_{z}}{t S_{o}}\] $\text{P}_{\text{z}}=$ Cutting force, $\text{V}_{\text{c}}=$ Cutting Velocity
\[U_{s}=\frac{P_{Z} V_{c}}{M R R}=\frac{P_{z}}{t S_{o}}\] $\text{P}_{\text{z}}=$ Cutting force, $\text{V}_{\text{c}}=$ Cutting Velocity