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Mec 123 machine tools technology and practice pdf download

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Mec 123 machine tools tech and practice pdf download

 

MEC 123 PDF TABLE OF CONTENTS

 

 

WEEK 1: THEORY OF METAL CUTTING

1.1 Introduction
1.2 Mechanics of cutting
1.3 The action of cutting tools
1.4Exercises

WEEK 2:

1.5 Chip formation
1.6 Discontinuous chip
1.7 Continuous with built up edge
1.8 Continuous chip
1.9 cutting temperature
1.10 Cutting fluids
1.11 Types of cutting fluids
1.12 Economic advantages of cutting fluids
1.13 Exercises

WEEK 3:

2.0 Cutting tool materials
2.1 Introduction
2.2 High carbon steel
2.3 High speed steel
2.4 Satellite
2.5 Cemented or tungsten carbides
2.6 Ceramics
2.7 Diamond
2.8 Exercises

WEEK 4

3.0 Lathe machines
3.1 Introduction
3.2 Capstan and turret lathe (production lathe)
3.3 Engine lathe
3.4 Bench lathe
3.5 Speed lathe
3.6 Gap-bed lathe
3.7 Tool room lathe
3.8 Lathe parts
3.9 Safety precautions
3.10 Exercises

WEEK 5

3.11 Lathe operations
3.12 Exercises

WEEK 6

3.13 Lathe accessories
3.14 Exercises

WEEK 7

3.15 Taper turning using attachments
3.16 Cutting taper with tailstock off-set
3.17 Cutting taper with compound rest method
3.18 Exercises

WEEK 8

4.0 Shaping machine
4.1 Introduction
4.2 Main parts of shaping machine
4.3 Shaping machine driving mechanism
4.4 Action of the shaping machine
4.5 Feed mechanism
4.6 Exercises

WEEK 9

4.7 Cutting speed
4.8 Tool holding in shaping machine
4.9 Tool head clapper box
4.10 Holding the work
4.11 Machining vertical and angular faces
4.12 Shaping tools
4.13 Safety precautions
4.14 Exercises

WEEK 10

5.0 Milling machine
5.1 Introduction
5.2 Types of milling machines
5.3 Types of milling cutters
5.4 Face milling cutters
5.5 Construction of milling cutters
5.6 Cutter materials
5.7 Cutting speeds, feeds and depths of cut
5.8 Exercises

WEEK 11

5.9 Dividing heads
5.10 Types of dividing head
5.11 Methods of indexing
5.12 Milling operations
5.13 Exercises

WEEK 12

6.0 Grinding machines
6.1 Introduction
6.2 Types of grinding machines
6.3 Grinding and safety instructions
6.4 Exercises

WEEK 13

6.5 Surface grinder
6.6 Introduction
6.7 Mounting of grinding wheel
6.8 Exercises

WEEK 14

6.9 Truing and dressing a grinding wheel
6.10 Safety precautions
6.11 Grinding a flat surface
6.12 Exercises

WEEK 15

6.13 Precautions to be observed when mounting a grinding wheel
6.14 Characteristic terms used in grinding
6.15 Grinding faults
6.16 Thermal effect of grinding
6.17 Trouble shooting in grinding
6.18 Exercises

 

Mec 123 PDF download Chapter 1

SPECIFIC LEARNING OUTCOME: At the end of this week the students
should be able to;

– Explain the theory of metal cutting
– Define forces acting at a tool point
– Sketch a diagram of forces acting at tool point
– Relate the tool angles to cutting efficiency.
1.0 Theory of metal cutting
Introduction
In the workshop, most of the shaping involves cutting the metal. The usual conception of
cutting involves tearing the substance apart with a thin knife edge or wedge. When the cut is
taken the chip presses heavily on the tool some distance back from the extreme point.
The pressure of the tool on the chip tears the chip from the body of the metal as illustrated in
the diagram below, this tear continues along a generated crack.

At the same time the chip suffers severe pressure and shearing force, being sheared and
compressed up to a much shorter length by the time it leaves the tool. The surface of the
work is left in a torn and rough condition; it is at this point that the extreme tip of the tool
does its work by trimming off the irregularities and leaving the surface in a reasonably
smooth condition.

1.1 MECHANICS OF CUTTING

Cutting is divided into two namely Oblique and Orthogonal. Oblique cutting occurs when
turning along a bar with a straight roughing tool, the chip coming off at some angle. While
orthogonal cutting takes place when a cut is being taken by a knife tool fed along
perpendicular to its straight cutting edge. The resultant chip, in orthogonal cutting is the
continuous chip.

1.2 THE ACTION OF CUTTING TOOLS

Forces Acting at Cutting Tool Points
In order to determine the magnitude of the forces acting on a lathe tool a dynamometer is
used. It is essentially an instrument designed to measure energy. It thus measures the forces
acting on the point of
a lathe tool.

 

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