W A T K I N S - J O H N S O N C O M P A N Y Semiconductor Equipment Group

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Engineering 36
Lab-22 Chp8BeltFriction
Bruce Mayer, PE Licensed Electrical Mechanical
EngineerBMayer_at_ChabotCollege.edu
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Sticky Collar
ks 1.5 kN/m
µs 40

• Collar B of weight W can slide along bearing Rod
• Spring UNstretched for ? 0
• Find Range of Values for W for equilibrium when
• ? 20 and ? 30

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Rotating Roller

• Bucket A connected to Block C by cable that
  passes over Roller B
• Drum B rotates CounterClockwise slowly at a
  constant rate
• The Coefficients of Friction at All Surfaces
• µs 35 µk 25
• Find smallest Bucket Wt, W, for which Block C
  will
• a) Remain at REST (Belt SLIPPING)
• b) be ABOUT to move UP the InCline
• c) Continue to move UP the Ramp at a CONSTANT
  speed

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Sticky Collar
85kg
µs 40

• Given Geometry and 85kg Motor the mount has
  negligible weight
• The motor Wt on the Pivoted mount maintains the
  tension in the Flat Drive Belt
• µs for the Belt and Drums A B is 0.40
• Find Largest Torque, T, which can be transmitted
  to Drum B when Drum A rotates Clockwise

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