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2019 DT Sec 2

Mechanism

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Types of Motion

  • LINEAR - Motion that moves an object in a straight line from its starting point. Newtons 1st law suggests an object will continue to travel in a straight line unless a unbalanced force is applied. Forces such as drag, gravity and friction will prevent this on earth
  • RECIPROCATING - Motion that pivots back and forth in a linear direction. This could be likened to a saw blade or a pneumatic drill
  • ROTARY - Motion that turns the object in a complete 360° circle around and axis, often repeatedly. This motion is simple to remember as wheel or fan. The strength of this motion is defined as torque and the repetitions are counted in RPM (Rev. per min)
  • OSCILLATING - Motion is a combination of rotary and reciprocating. The object is offset from the axis and rotates back and forth in a arc. This is best likened to the swing of a pendulum

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Mechanical System Block Diagram

•An open loop system has no feedback, so it cannot respond to changes in the environment.

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Types of Motion

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Linkages

Linkages are mechanical system used to carry out different jobs or functions

  • Conversion of motion
  • Transmission of Motion
  • Control of Motion

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Secondary Research on existing mechanisms

Pictures/Videos of mechanisms (Internet/Textbook)

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Mechanical System Block Diagram

Open Loop System

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Example of Mechanical Linkage Toy