INTRODUCTION TO MACHINE DESIGN

1. INTRODUCTION TO
MACHINE DESIGN-II(BME 616)

2. INTRODUCTION
• Machine Design is creation of new and better
machines and improving the existing ones.
• A new or better machine is one which is more
economical in the overall cost of production and
operation.
• In designing it is necessary to have a good knowledge
of Mathematics, Engineering Mechanics, Strength of
Materials, Theory of Machines, Workshop Processes
and Engineering Drawing.
• This course applies fundamental knowledge regarding
failure prevention to design specific mechanical
elements, including: gears; bearings and IC Engine.

3. CLASSIFICATIONS OF MACHINE DESIGN
• Adaptive design: Adaptation of existing designs.
The designer only makes minor alternation or
modification in the existing designs of the product.
• Development design: Modify the existing designs
into a new idea by adopting a new material or
different method of manufacture. 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.

4. 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.
• Convenient and economical features.
• Use of standard parts.
• Safety of operation.
• Workshop facilities.
• Number of machines to be manufactured.
• Cost of construction etc.

5. 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.

6. ANALYSIS Versus SYNTHESIS
ANALYSIS
• Analysis means evaluating the
system and seeing if it works
properly (its kind of like reverse
engineering ) .
• If given any system, its analysis
will show its behavior.
• Once the concept is designed,
to properly understand the
performance of the product that
was designed as per the
engineering requirements.
• ANALYSIS is just verification.
SYNTHESIS
• Synthesis means making a system
based on the specifications that
you have .
• Synthesis is a scheme to generate
a possible way the product work.
• Synthesis: Given a set of technical
requirements.
• It will generate the system that
performs as required. It can also
be called as concept design.
• In the design process a number of
concepts will be identified and
then the best concept is chosen
for further development.
• Engineering design is SYNTHESIS.

7. FUNDAMENTAL UNITS
• The measurement of physical quantities is
one of the most important operations in
engineering.
• Every quantity is measured in terms of
some arbitrary, but internationally
accepted units, called fundamental units.

8. DERIVED UNITS
• Some units are expressed in terms
of other units, which are derived
from fundamental units, are known
as derived units.
• Example: the unit of area, velocity,
acceleration, pressure, etc.

9. SYSTEM OF UNITS
• There are only four systems of units, which are
commonly used and universally recognized.
These are known as :
1. C.G.S. units (centimeter–gram–second),
2. F.P.S. units (Foot–pound–second),
3. M.K.S. units( Meter-kilogram-second), &
4. S.I. units (International System of Units).

10. FUNDAMENTAL AND SUPPLEMENTARY UNITS.

11. DERIVED UNITS

12. PREFIXES USED IN BASIC UNITS

13. THANK YOU