Theory of MachinesMechanical Engineering

Straight Line Mechanisms

Straight Line Mechanisms

A mechanism built in such a manner that a particular point in it is constrained to trace a straight line path within the possible limits of motion is known as a straight-line motion mechanism.

Straight-line motion can be generated by either sliding pairs or turning pairs. Sliding pairs are bulky and gets worn out rapidly. Therefore, turning pairs are preferred over sliding pairs for generating straight line motion. Straight-line motion can be generated either accurately or approximately.

Exact Straight Line Mechanisms

  1. Peaucellier Mechanism
  2. Hart Mechanism
  3. Scott-Russel Mechanism

Approximate Straight Line Mechanisms

  1. Grasshopper mechanism
  2. Watt mechanism
  3. Tchebicheff Mechanism
  4. Robert’s Mechanism

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