Design of Machine Elements

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Design of Machine Elements

• An applications course
• Separates Designer from Design Engineer
• Uses a wide range of your background courses

• Statics Dynamics
• Strength of Materials
• Materials and Processes
• Manufacturing Processes

• Technical Drawing
• Intro to Design
• Machines Mechanisms

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Engineering Design
Design of Machine Elements
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Mechanical Design

• The process of selecting mechanical components
  and putting them together to accomplish a desired
  function.
• Integration

• Requires
• Imagination
• Component familiarity

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Design of Machine Elements

• The determination of appropriate geometry and
  materials for the individual components of a
  mechanical design

• Requires
• Attention to details
• Engineering analysis

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Iteration

• Design is iterative
• Need to investigate all interactions
• Strive to achieve an optimal design
• maximize benefits
• minimize weaknesses

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Engineering Specifications
Before formulating a design, the objective must
be fully defined.

• Functions
• Design Requirements
• Criteria

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Functions

• Descriptions, in mostly general terms, of what
  the device is suppose to do.

• To transmit .
• To support
• To lift ...

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Design Requirements
Detailed and specific performance characteristics
of the machine

• How much force must be transmitted
• How fast must it travel
• Effort required to use the machine
• Maximum dimensions
• Maximum weight

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Criteria

• Attributes that will guide the designer to an
  optimum design.

• Safety
• Ease of operation
• Reliability
• Low cost
• Appearance

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Example

• Develop a set of functions, requirements and
  criteria for

• 1. A garage door opener.
• 2. An automotive windshield wiper system.
• 3. A push-type parking lot line painter
• 4. A lawn sprinkler
• 5. A hardware store paint mixer
• 6. Child carrier for a bicycle
• 7. Tree stump remover