Mechanical 6th Semester Previous year ques..sbte
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Machine Design
• Definition
– Machine Design is defined as the use of scientific
principles, technical information and imagination
in the description of a machine or a mechanical
system to perform specific functions with
maximum economy and efficiency
Design is an innovative and highly iterative
process
–Specify functions
• Bearing
• Spring
• Screw fastening
–Force
determination
• Free body diagram
–Selection of
Material
• Availability
• Man. Considerations
• Properties
–Failure Criterion
•Elastic deflection
•General yielding
•Fracture
–Geometry &
Dimensions
•Operating conditions
•Basis of failure
criterion
DESIGN SYNTHESIS
Design Synthesis is defined as the process of
creating or selecting configurations, materials,
shapes and dimensions for a product.
ERGONOMIC CONSIDERATIONS
Ergonomics is defined as the relationship between man
and machine and the application of anatomical,
physiological and psychological principles to solve the
problems arising from man-machine relationship
• Design of driver’s seat
• Layout of instrument dials and display panels
• Design of hand levers and hand wheels
• Energy expenditure in hand and foot operations
• Lighting, noise and climatic conditions in machine
environment
Standardization
The characteristics include materials, dimensions and shape
of the component, method of testing and method of
marking, packing and storing of the product
• Standards for materials, their chemical compositions,
Mechanical properties and Heat Treatment
• FG 150, FG 200, FG 220- (IS 210): Strength
• 55Cr3- (IS 570 Part 4): Chemical composition
• Standards for shapes and dimensions of commonly used
machine elements
• Dimension and cross section of V belts (IS 2494)
