MANUFACTURING PROCESSES – II (EMEC303L)
ASSIGNMENT – 01 Date: 9th August 2023 / Due Date: 16th August 2024, 1 pm
To be filled -in by faculty:
Mapping of Questions to Program Outcomes
Q. No. 1 2 3 4 5 6 7 8 9
CO CO 1
PO PO3, PO5,PO7 and PO1
BTL L1 L2 L4 L5 L5 L2 L5 L5 L4, L5
Attempt all the questions neatly and sequentially. All diagrams must be drawn with pencil.
1) What are the important specifications of an engine lathe? List the different operations that can be
performed on lathe machine
2) Explain the various methods to accomplish taper turning on lathe machine with the help of neat sketch.
3) Differentiate between the following;
a) Up milling and down milling b) turret lathe and capstan lathe
c) Speed lathe and tool room lathe d) Gang milling and straddle milling
e) Face milling and slab milling
4) On a center lathe, a cylindrical workpiece of 100 mm diameter is being turned to a
diameter of 80 mm, with 100 rpm. The length of the workpiece is 250 mm. The feed is
0.25mm/rev and depth of cut per pass is 2 mm. Taking approach and overtravel distance to
be 3 mm each, what is the machining time for one pass (in min), and the total machining
time? If the specific cutting energy (SCE) is 1.8 GJ/m3, determine the power consumption in
Watt to complete the operation.
[Hint: Power consumption = material removal rate (MRR in m3/s) x SCE, MRR = feed (mm/rev) x depth
of cut (mm) x cutting speed (mm/s)]
5) The given job has to be machined, as shown in adjacent
figure. The cutting parameters are;
V = 20m/min, feed = 0.3 mm/rev, d = 2.5 mm. Determine the
total machining time.
6) With the help of a neat and labelled sketch illustrate all the parts of a column and knee type horizontal
milling machine.
7) Assume the index plates available are:
Plate no. 1: 15, 16, 17, 18, 19, 20 holes
Plate no. 2: 21, 23, 27, 29, 31, 33 holes
Plate no. 3: 37, 39, 41, 43, 47, 49 holes
Determine the indexing requirements for the following;
a) 10 ̊ 30 ́ b) 41 ̊ 20 ́ c) 55 ̊ 40 ́
b) 24 divisions on the given blank using simple indexing method
c) 93 divisions on the work piece using compound indexing method.
d) 76 divisions on the work piece using compound indexing method.
e) 52 divisions on the given job using a differential indexing head. The change gear set available is;
16,20,24,28,32,36,40,44,48,56,64,72,80,86,100.
f) 76 divisions on the given job using a differential indexing head, with the same gear train.
8) A grey CI job 150 mm (w) x 450 mm (L) has to be finished by milling. A face mill cutter of 200 mm
diameter and 10 teeth is being used, with cutting speed 70 m/min and feed per tooth 0.25 mm.
Calculate the following, assuming a depth of cut of 1 mm;
a) Machining time for finishing the job if entire stock is removed in a single cut.
b) Material removal rate in mm3/min
9) If the above job is machined with HSS slab mill of 150 mm diameter, 200 mm width & 8 teeth, with a
cutting speed of 40 m/min and feed per tooth 0.25 mm, compare the machining time and material
removal rates in both the cases.
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