B B7040

Total Pages: 2
Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: ME303
Course Name: MACHINE TOOLS AND DIGITAL MANUFACTURING (IE, ME)

Max. Marks: 100 Duration: 3 Hours
PART A
Answer any three full questions, each carries 10 marks. Marks
1 a) Define tool signature. How is it related to tool geometry? (4) b) Sketch the top
view, front view and end view of a 25-mm square bit having tool (6) signature of 15-

15-10-10-15-10-3 and label all parts.
2 >) Clearly explain the utility of Merchant’s Circle Diagram. How it canbe (4) plotted?
b) A lathe while running consumes 2000W when cutting a steel specimen at (6)
30m/min. Determine the cutting force and torque at the spindle running at 120 rpm.
Also determine the specific power consumption if the depth of cut is 4 mm and feed
is 0.25 mm/rev.
3 9) Discuss the relative merits and demerits of the different methods for machining (4)
external taper on lathe.
b) State any six advantages of using cutting fluids during machining. (6)
4 १) Sketch a fully labelled schematic diagram of a Radial Drilling Machine. List (6) any four
key design features that make it popular.
b) Identify the possible causes for the following problems in drilling: (4) i) Drill
breakage ii) Oversized hole 111) Rough hole iv) Breakage of
outer corners of cutting edges.

PART B
Answer any three full questions, each carries 10 marks.

5 9) With the help of a fully labelled schematic diagram, explain the kinematic (6) system
provided in shaping machine for transmitting power and motion from the motor to the tool
and job at desired speeds and feeds.

b) With the help of neat sketches explain any two operations (other than (4) machining
of flat surfaces) that can be carried out using a shaping machine.

6 93) Compare and contrast (differentiate) shaping machine, slotting machine and (10)

planing machine.

7 a) Differentiate between up-milling and down milling operations. (5)
b) Show 03 mean cross-sectional area of chip in plain milling is given by (5)
rw fa

−− ; Where f = feed in mm/m; N = cutter rpm; D = milling cutter
diameter; d= depth of cut; m= No of tooth in cutter; W = Width of work piece.

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