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Reg
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: ME303
Course Name: MACHINE TOOLS AND DIGITAL MANUFACTURING ME)
Max. Marks: 100 Duration: 3 Hours
PART A
Answer any three full questions, each carries 10 marks. Marks
1 Define tool signature. How is it related to tool geometry?
Sketch the top view, front view and end view of a 25-mm square bit having tool
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 can be
plotted?

A lathe while running consumes 2000W when cutting a steel specimen at
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 Discuss the relative merits and demerits of the different methods for machining
external taper on lathe.

State any six advantages of using cutting fluids during machining.
4 Sketch a fully labelled schematic diagram of a Radial Drilling Machine. List
any four key design features that make it popular.

Identify the possible causes for the following problems in drilling:
Drill breakage ii) Oversized hole
iii) Rough hole iv) Breakage of outer corners of cutting edges.

PART B
Answer any three full questions, each carries 10 marks.
5 With the help of a fully labelled schematic diagram, explain the kinematic
system provided in shaping machine for transmitting power and motion from
the motor to the tool and job at desired speeds and feeds.

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

6 Compare and contrast (differentiate) shaping machine, slotting machine and
planing machine.

7 Differentiate between up-milling and down milling operations.
Show that the mean cross-sectional area of chip in plain milling is given by



Where f feed in 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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8 With the help of simple sketches, explain any three common attachments used
in Milling Machines.

Estimate the machining time that will be required to finish a vertical flatsurface
of length 120 mm and depth 15 mm by an 8 teeth HSS end millcutter of 32 mm
diameter and 60 mm length in a milling machine. Assume, cutting velocity 30
m/min, feed 0.12 mm/tooth.

PART C
Answer any four full questions, each carries 10 marks.
9 With suitable sketches, clearly explain the similarities and differences between
cylindrical grinding and centreless grinding.

The base of a brass bracket has to be rough ground to remove the unevenness.
Suggest the most suitable grinding wheel for this purpose. Justify the choice of
the wheel also.

10 Differentiate between truing and dressing of a grinding wheel
Write a short note on the self-sharpening characteristic of a grinding wheel.
11 Explain the basic principle of broaching.
Explain the kinematic system and operating principle of a swiss type automatic
lathe with the help of a line diagram.

12 With the help of a suitable illustration explain the concept of Digital
Manufacturing.

With the help of a block diagram explain the Architecture of Digital
Manufacturing System.

13 Briefly outline the system modelling principle, modelling methods and
modelling steps followed to create an abstract model of the digital
manufacturing system.

Formulate the general mathematical model of the digital manufacturing system.
14 Write short notes on the following models of digital manufacturing system:
Organization Model ii) Function model
iii) Information model iv) Operation Control Model

Explain the role of Bionic Mechanics and Manufacturing Intelligence in Digital
Manufacturing.