STUPIDSID
1(a)
Write the principles of operation in lathe machine.
2 M
1(b)
Distinguish between steady rest and follower rest.
2 M
1(c)
State the function of a lathe center, sketch and show the elements of a center.
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d)
1mm pitch screw thread (Internal) is to be cut in a center lathe having a 6.T.P.I. lead screw. Calculate gearing arrangements for driver and driven assuming usual quadrant restrictions and change .Pgears availability.
7 M
1(e)
1.5 mm pitch threads are to be cut by a lathe machine on 30 mm diameter M.S.rod at a cutting speed of 9m/min to a length 200 mm. Calculate the thread cutting time.
7 M
2(a)
Enlist the composition of a grinding wheel?
2 M
2(b)
Enlist the advantages of grinding machine over other conventional machining processes.
2 M
2(c)
State about the term speed , feed and depth of cut used in grinding operations.
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d)
Compare between center less grinding and cylindrical grinding?
7 M
2(e)
Calculate the wheel speed of a shaft with a diameter of 100 mm which is to be grinded. Assume peripheral speed of the work piece as 15 m/min.
7 M
3(a)
Write the advantages of using a Broaching machine.
2 M
3(b)
Name the operations that may be performed by a Broaching machine.
2 M
3(c)
Sketch and write the steps to be followed in spur gear milling.
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d)
Calculate the feed/revolution to drill a hole of 20 mm in one minute to a plate thickness of 30 mm and using a spindle speed of 500 r.p.m.
7 M
3(e)
Compare between plain milling and universal milling machines.
7 M
4(a)
Specify a shaping machine.
2 M
4(b)
Sketch quick return mechanism adopted in a shaping machine.
2 M
4(c)
Explain the process of gear shaving.
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d)
Calculate the machining time required for taking a complete cut by two rough cuts and one finish out on a gray C.I. Plate 800mm×600mm, cutting speed=12m/min. Return/cutting time ratio =2:3, feed - 1.5 mm/cycle, allowances length-wise=20mm, allowances width-wise=5mm
7 M
4(e)
Write step by step how will calculate the machining time of a flat surface in a shaping machine.
7 M
5(a)
What is signal flow diagram?
2 M
5(b)
Enlist the steps for writing transfer function.
2 M
5(c)
Discuss advantages of transducers.
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d)
What is an automatic control system? What are its advantages and applications?
7 M
5(e)
Briefly discuss the classification of CNC machines?
7 M
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