Question $1$

A turning operation is performed on an engine lathe using a tool with zero rake angle in the direction

of chip flow. The work material is an alloy steel with hardness $=325$ Brinell. Feed $=0\mathrm{.}015i\frac{n}{r}ev,$ depth

of cut $=0\mathrm{.}125in,$ and cutting speed $=300f\frac{t}{m}in.$ After the cut, the chip thickness ratio $=0\mathrm{.}45.($a$)$ Using

the appropriate value of specific energy from the Table in Q$4,$ calculate the gross horsepower in $($hp$)$ at

the drive motor, if the lathe efficiency $=85\%.($Round your answer to one decimal point$)$

Integer, decimal, or Enotation allowed

Question $2$

From Q$1,$ calculate the lathe gross power in kilowatt $(kW)$ if feed $=0\mathrm{.}50m\frac{m}{r}ev.($Round your answer

to one decimal point$)$