Chapter 20 - Theory of Metal Machining

Which of the following manufacturing processes are classified as material removal processes (two best answers)

• Casting

• Machining

• Extrusion

• Grinding

• Spinning

A lathe is used to perform which one of the following manufacturing operations

• Broaching

• Drilling

• Lapping

• Milling

• Turning

With which one of the following geometric forms is the drilling operation most closely associated

• External Cylinder

• Flat Plane

• Round Hole

• Screw Threads

• Sphere

If the cutting conditions in a turning operation are cutting speed = 300 ft/min, feed = 0.010 in/rev, and depth of cut = 0.100 inch, which one of the following is the material removal rate

• 0.025 in³/min

• 0.3 in³/min

• 3.0 in³/min

• 3.6 in³/min

A roughing operation generally involves which one of the following combinations of cutting conditions where v = cutting speed, f = feed, and d = depth

• high v, f, and d

• high v, low f and d

• low v, high f and d

• low v, f, and d

Which of the following are characteristics of the orthogonal cutting model (three best answers)

• a multiple-cutting-edge tool is used

• only two dimensions play an active role in the analysis

• the cutting edge is parallel to the direction of cutting speed

• the cutting edge is perpendicular to the direction of cutting speed

• the two elements of tool geometry are rake and relief angle

The chip thickness ratio is which one of the following where t_c = chip thickness after the cut, t_o = chip thickness before the cut, f = feed, d = depth, and w = width of cut

• t_c/t_o

• t_o/t_c

• f/d

• t_o/w

Which one of the four types of chip would be expected in a turning operation conducted at low cutting speed on a brittle work material

• Continuous

• Continuous with built-up edge

• discontinuous

• serrated

According to the Merchant equation, an increase in rake angle would have which of the following results, all other factors remaining the same (two best answers)

• Decrease friction angle

• decrease in power requirements

• decrease in shear plane angle

• increase in cutting temperature

• increase in shear plane angle

In using the orthogonal cutting model to approximate a turning operation, the chip thickness before the cut to corresponds to which one of the following cutting conditions in turning

• Depth of cut d

• feed f

• speed v