Previous year question paper for WT2 (Diploma Mechanical Engineering 4th)

1. Cutting Tools and Cutting Materials (04 hrs)

1.1. Cutting Tools - Various types of single point cutting tools and their uses,

Single point cutting tool geometry, tool signature and its effect, Heat

produced during cutting and its effect, Cutting speed, feed and depth of cut

and their effect

1.2 Cutting Tool Materials - Properties of cutting tool material, Study of

various cutting tool materials viz. High-speed steel, tungsten carbide, cobalt

steel cemented carbides, stellite, ceramics and diamond.

2. Lathe (12 hrs)

2.1 Principle of turning

2.2 Function of various parts of a lathe

2.3 Classification and specification of various types of lathe

2.4 Work holding devices

2.5 Lathe tools and operations :- Plain and step turning, facing, parting off,

taper turning, eccentric turning, drilling, reaming, boring, threading and

knurling, form turning, spinning.

2.6 Cutting parameters – Speed, feed and depth of cut for various materials and

for various operations, machining time.

2.7 Speed ratio, preferred numbers of speed selection.

2.8 Lathe accessories:- Centers, dogs, different types of chucks, collets, face

plate, angle plate, mandrel, steady rest, follower rest, taper turning

attachment, tool post grinder, milling attachment, Quick change device for

tools.

2.9 Introduction to capstan and turret lathe

3. Drilling (06 hrs)

3.1 Principle of drilling.

3.2 Classification of drilling machines and their description.

3.3 Various operation performed on drilling machine – drilling, spot facing,

reaming, boring, counter boring, counter sinking, hole milling, tapping.

3.4 Speeds and feeds during drilling, impact of these parameters on drilling,

machining time.

3.5 Types of drills and their features, nomenclature of a drill

3.6 Drill holding devices.

4. Boring (04 hrs)

4.1 Principle of boring

4.2 Classification of boring machines and their brief description.

4.3 Boring tools, boring bars and boring heads.

5. Shaping, Planing and Slotting (04 hrs)

5.1 Working principle of shaper, planer and slotter.

5.2 Type of shapers

5.3 Type of planers

5.4 Types of tools used and their geometry.

5.5 Speeds and feeds in above processes.

6. Broaching (04 hrs)

6.1 Introduction

6.2 Types of broaching machines – Single ram and duplex ram horizontal type,

vertical type pull up, pull down, push down.

6.3 Elements of broach tool, broach tooth details – nomenclature, types, and

tool material.

7. Jigs and Fixtures (06 hrs)

7.1 Importance and use of jigs and fixture

7.2 Principle of location

7.3 Locating devices

7.4 Clamping devices

7.5 Advantages of jigs and fixtures

8. Cutting Fluids and Lubricants (08 hrs)

8.1 Function of cutting fluid

8.2 Types of cutting fluids

8.3 Difference between cutting fluid and lubricant

8.4 Selection of cutting fluids for different materials and operations

8.5 Common methods of lubrication of machine tools.