STUPIDSID
1 (a)
What are the main characteristics of cutting tool materials.
3 M
1 (b)
Explain in brief Taylor's relationship for cutting speed-tool life.
4 M
1 (c)
During an orthogonal machining ( turning) operation of C-40 steel, the following data were obtained.
(1) Chip thickness = 0.45mm
(2) Width of cut = 2.5mm
(3) Feed = 0.25mm/rev
(4) Tangential cut force = 1130N
(5) Feed thrust force = 295N
(6) Cutting speed = 2.5m/s
(7) Rake angle = 10°
Calculate
(1) Force of shear at shear plane
(2) Kinetic co-efficient of friction.
(1) Chip thickness = 0.45mm
(2) Width of cut = 2.5mm
(3) Feed = 0.25mm/rev
(4) Tangential cut force = 1130N
(5) Feed thrust force = 295N
(6) Cutting speed = 2.5m/s
(7) Rake angle = 10°
Calculate
(1) Force of shear at shear plane
(2) Kinetic co-efficient of friction.
7 M
2 (a)
Discuss various types of tool wears and their causes.
7 M
Answer any two question from Q2 (b) or Q2 (c)
2 (b)
A 300mm dia. bar is turned at 45rev/min with depth of cut of 2mm and feed of
0.3mm/rev. The forces measured at the cutting tool point are
Cutting force = 1850N Feed force = 450N
Calculate
(1) power consumption
(2) specific cutting energy.
0.3mm/rev. The forces measured at the cutting tool point are
Cutting force = 1850N Feed force = 450N
Calculate
(1) power consumption
(2) specific cutting energy.
7 M
2 (c)
The following equation for tool life is given for a turning operation
V T0.13 f0.77 d0.37=C
A 60 min tool life was obtained while cutting at V = 30m/min, f = 0.3mm/rev and d = 2.5mm.
Determine the changes in tool-life if the cutting speed, feed and depth of cut are increased by 20% individually and also taken together.
V T0.13 f0.77 d0.37=C
A 60 min tool life was obtained while cutting at V = 30m/min, f = 0.3mm/rev and d = 2.5mm.
Determine the changes in tool-life if the cutting speed, feed and depth of cut are increased by 20% individually and also taken together.
7 M
Answer any two question from Q3 (a), (b) or Q3 (c), (d)
3 (a)
Classify various non-conventional machining processes.
7 M
3 (b)
Explain the working principle of EDM. What are the main process parameters. State advantages of EDM.
7 M
3 (c)
State various thread manufacturing methods.
3 M
3 (c)
Explain gear finishing processes.
7 M
3 (d)
Differentiate between gear forming and gear generating methods.
4 M
Answer any two question from Q4 (a), (b), (c) or Q4 (d), (e), (f)
4 (a)
What are the advantages of using jigs and fixtures.
3 M
4 (b)
Explain in brief Angle jig.
4 M
4 (c)
Explain basic design steps for cam for single spindle automat.
7 M
4 (d)
Explain in brief hydraulic clamp.
3 M
4 (e)
Explain in brief Indexing jig by taking suitable example.
4 M
4 (f)
Differentiate between Capstan and turret lathe
7 M
Answer any two question from Q5 (a), (b) or Q5 (c), (d)
5 (a)
How cutting force is calculated for press work. What are the various methods for reducing force requirements.
7 M
5 (b)
Explain in brief two pass layout in press work by taking suitable example.
7 M
5 (c)
Explain various methods of mounting of punches.
7 M
5 (d)
Explain various machine tool structures, based on rigidity.
7 M
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