Question 1 Which of the following process cannot be done on a lathe (without a s

Question

Question 1 Which of the following process cannot be done on a lathe (without a special attachment)? (Ch.22) a.Drilling b.Milling c.Knurling d.Boring

Question 2 Which of the following parts in lathe is used in threading operation but not in turning operation? (Ch.22) a.Feed rod b.Spindle c.Carriage assembly d.Lead screw

Question 3 Which type of lathe helps in carrying out different sequential operations on a single workpiece with minimal tool change time? (Ch.22) a.Tool room lathe b.Turret lathe c.Gap-bed lathe d.Bench lathe

Question 4 Which among these is the hardest material for a cutting tool? (Ch.21) a.High-speed steel b.Sintered carbide c.Alloy steel d.Cubic boron nitride

Question 5 Which of the following tool material doesn't involve sintering process? (Ch.21) a.Tool steel b.Cubic boron nitride c.Ceramics d.Polycrystalline diamond

Explanation / Answer

Q1: Milling cannot be done on a lathe without special attachments, the milling tool needs rigid support and it will fall down in lathe machine. All the other 3 operations can be done on a lathe machine without any special attachments.

Q2: For threading, precise constant movement of tool is necessary, and this could be achieved only by using feed rod. Feed rod is a threaded shaft coupled to spindle and the carriage containing tool post moves over it. Feed rod is not much necessary in turning operation.

Q3: Turret lathe is a lathe machine having a turret which is a circular roratable tool post containig several tools. For example if a component need to be processed 3 simultaneous operations of turning, drilling and counterboring, the turret will have the 3 tools needed for the operatios and after one process is finished, the turret could be rotated to get the second tool into position without tool change.

Q4: Introduced in the early 1960s, this is the second hardest material available after diamond. cBN tools may be used either in the form of small solid tips or as a 0.5 to 1 mm thick layer of of polycrystalline boron nitride sintered onto a carbide substrate under pressure. In the latter case the carbide provides shock resistance and the cBN layer provides very high wear resistance and cutting edge strength. Cubic boron nitride is the standard choice for machining alloy and tool steels with a hardness of 50 Rc or higher. Typical cutting speeds: 30 - 310 m/min.

Q5: Tool steel doesnt involve in sintering process instead they are formed by controlled quencing and hardening processes. the rest 3 materials have to undergo sintering process to form.

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