A shaft is a spinning machine component that transmits power from one part to another or from a machine that creates power to a machine that absorbs power. Shafts are typically circular in cross section.

1. Introduction

2. Introduction
• Definition.
• Classifications of Machine Design.
• General Considerations in Machine Design.
• General Procedure in Machine Design.
• Units
• Fundamental Units.
• Derived Units.
• System of Units.
10-09-2022 Module 1.1 - Introduction 2

3. Introduction
• S.I. Units (International System of Units).
• Presentation of Units and their values.
• Rules for S.I. Units.
• Laws of Motion.
• Absolute and Gravitational Units of Force.
10-09-2022 Module 1.1 - Introduction 3

4. Definition.
• Creation of new and better machines and improving the existing ones.
• More economical in the overall cost of production and operation.
• From the study of existing ideas, a new idea has to be conceived.
• Commercial success and given shape and form in the form of drawings.
• Good knowledge of many subjects such as
• Mathematics,
• Engineering Mechanics,
• Strength of Materials,
• Theory of Machines,
• Workshop Processes and Engineering Drawing.
10-09-2022 Module 1.1 - Introduction 4

5. Classifications of Machine Design
Adaptive design.
This type of design needs
no special knowledge or
skill
The designer only makes
minor alternation or
modification in the existing
designs of the product.
Development design.
This type of design needs
considerable scientific
training and design ability
Designer starts from the
existing design, but the final
product may differ from the
original product.
New design.
This type of design needs
lot of research, technical
ability and creative thinking.
Only those designers who
have personal qualities of
high order can take up the
work of a new design.
10-09-2022 Module 1.1 - Introduction 5

6. Further Design Process
Rational
design
This type of design depends
upon mathematical
formulae of principle of
mechanics.
Empirical
design
This type of design
depends upon empirical
formulae based on the
practice and past
experience.
Industrial
design
This type of design depends
upon the production aspects
to manufacture any
machine component in the
industry.
10-09-2022 Module 1.1 - Introduction 6

7. Further Design Process
Element
design
System
design
Computer
Aided
Design
Optimum
design
It is the best
design for the
given objective
function under
the specified
constraints.
It may be
achieved by
minimizing
the
undesirable
effects.
It is the design
of any
complex
mechanical
system like a
motor car.
It is the design
of any element
of the
mechanical
system like
piston,
crankshaft,
connecting
rod, etc.
This type of
design depends
upon the use
of computer
systems to
assist in the
creation,
modification,
analysis and
optimization
of a design.
10-09-2022 Module 1.1 - Introduction 7

8. General Considerations in Machine Design
Type of load and
stresses caused by
the load.
Motion of the parts
or kinematics of the
machine.
Selection of
materials
Form and size of
the parts.
Frictional resistance
and lubrication.
Convenient and
economical
features.
Use of standard
parts.
Safety of operation.
Workshop facilities.
Number of
machines to be
manufactured.
Cost of
construction.
Assembling.
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9. General Procedure in Machine Design
Recognition of
need.
Synthesis
(Mechanisms).
Analysis of forces. Material selection.
Design of
elements
(Size and Stresses).
Modification.
Detailed
drawing.
Production.
10-09-2022 Module 1.1 - Introduction 9

10. B.Varun
9787608011
bvarun.me@gmail.com
varun.me@srit.org
varunnelson bvarun.me
varunme bvarunme 10-09-2022 10
Module 1.1 - Introduction