Draw the Merchants circle diagram and specify various entities on it. State the conditions under which it is valid.
[7 marks]With the help of neat sketches explain (i) any one of the gear generating process (ii) any one of the thread manufacturing method
[7 marks]Name the commonly used dielectric fluids. Explain the functions performed by the dielectric fluid in EDM process Explain the formation of “re-cast layer” in EDM process. Specify whether the “re-cast” layer is desirable or not.
[3 marks]Data of an orthogonal cutting operation carried out on a mild steel workpiece of 80mm diameter, using a carbide tipped tool is given below: cutting speed = 280 m/min; feed = 0.25 mm/rev; cutting force = 1800 N; feed force = 1000N; and chip thickness = 0.32 mm, rake angle = 10°. Find the shear angle, shear force, normal force acting on the shear plane, friction force, coefficient of friction.
[7 marks]What do you mean by chip thickness ratio? How it is influenced by the shear plane angle? What are the functions of side rake and clearance angles? Can a single point tool have zero end cutting edge angle? Justify your answer
[4 marks]What do you mean by ultrasonic? With the help of a neat sketch, explain the functions performed by various elements of the USM system.
[7 marks]Why drives are required? Name the drives used in machine tools. Explain the working of any one of it (give a neat sketch).
[7 marks]Giving the relevant chemical reactions and a neat sketch, explain the ECM process
[7 marks]Differentiate between single spindle and multi spindle automats. Sketch and label (i) any one of the commonly used bed section and (ii) any one of the column section. Also specify their applications
[4 marks]Differentiate between conical and cylindrical locators. Give a neat sketch of each. Also give one example of use, in each type.
[7 marks]Why clamping devices are used? List all of them. With the help of a neat sketch, explain the working of any one of them. Suggest and sketch a bush, if the surface on which the hole to be drilled is inclined to the axis of the drill.
[2 marks]What are drill bushes? Why are they used in a jig? Name different types of jigs. How does a leaf jig differ from a plate jig (give neat sketches of each)
[7 marks]With the help of neat sketches, explain the terms (i) locating from plane surfaces and (ii) locating from circular surfaces1
[7 marks]Give the schematic illustration of shearing with a punch and die. With the help of neat sketches bring out the significance of clearance in shearing
[3 marks]Explain the following terms and bring out their significance (give sketches, wherever required) (i) scrap-strip layout (ii) guide rails, stripper plates and piolets
[7 marks]Schematically illustrate the making of a washer in a progressive die.
[7 marks]Citing a suitable example, explain the procedure to find the center of pressure. What is its significance in blanking
[7 marks]