Specific Energy in Machining

Q. The main cutting force acting on a tool during the turning (orthogonal cutting) operation of metal is $400N$. The turning was performed using $2mm$ depth of cut and $0.1mm/rev$ feed rate. The specific cutting pressure (in $N/m{m}^2$) is

1. $1000$
2. $2000$
3. $3000$
4. $4000$

Q. A through hole is drilled in an aluminum alloy plate of 15 mm thickness with a drill bit of diameter 10 mm, at a feed of 0.25 mm/rev and spindle speed of 1200 rpm. If the specific energy required for cutting this material is 0.7 $N-m/m{m}^3$, the power required is_____(round off to two decimal places).

1. 274.89

Q. When the depth of cut is increased, the specific cutting energy

1. Increases
2. Decreases
3. Remains same
4. Reaches an optimum value

Q. In orthogonal turning of medium carbon steel, the specific machining energy is $2.J/m{m}^3$. The cutting velocity, feed and depth of cut are $120m/min,0.2mm/rev$ and $2mm$ respectively. The main cutting force in $N$ is

1. $40$
2. $80$
3. $400$
4. $800$

Q. A metal cutting test was conducted on a lathe and the following were noted:
Vertical force on the tool = 2000 N
depth of cut = 2.00 mm
Feed = 5 cuts/mm
Pressure of the chip cross-sectional area on the tools is______ $kN/m{m}^2$

1. 5