Classic Mechanisms – How They Work

This section shows how some basic mechanisms work. These mechanisms can be used in a wide variety of mechanical devices to create desired motions:

  • Watts Linkage – creates nearly straight line motion using pivot links
  • Geneva Escapment Wheel – creates incremental rotatation
  • Intermittant Motion device – creates a delay between moving back and forth
  • Scotch Yoke – converts rotatary to linear motion
  • Scott Russel – converts vertical linear motion to horizontal linear motion
  • Rack and Pinion – converts linear motion to or from rotary motion
  • Locking Hold-down – clamps items firmly against a work surface
  • Ratchet Wheel – converts oscillating motion to intermittent rotary motion
  • Overrun Clutch – allows a rotary motion to drive another rotary member in one direction only¬†
  • Universal Joint – transmits rotary motion between members at various relative angles


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