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ME321 Kinematics and Dynamics of Machines

ME321 Kinematics and Dynamics of Machines. Steve Lambert Mechanical Engineering, U of Waterloo. Cam Design . Cam Types . Plate cam with translating roller follower. Cam Types. Translating or wedge cam with translating follower. Cam Types.

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ME321 Kinematics and Dynamics of Machines

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  1. ME321 Kinematics and Dynamics of Machines Steve Lambert Mechanical Engineering, U of Waterloo

  2. Cam Design

  3. Cam Types Plate cam with translating roller follower

  4. Cam Types Translating or wedge cam with translating follower

  5. Cam Types Cylindrical cam with translating roller follower

  6. Cam Types Face cam with oscillating follower

  7. Translating Followers (a) Flat-faced (b) Roller (c) Point

  8. Oscillating Followers Flat-Faced Roller Spherical-Face

  9. Positive Return Follower

  10. Cam Design

  11. Cam Design • We specify cams in terms of the required motion of the follower: • critical path motion • critical extreme position • Want to specify follower displacement to provide continuous velocity and acceleration - finite jerk • Once follower displacement specified, choose follower geometry and design cam profile

  12. Critical Path Motion • Draw displacement profile through required points • Difficult to ensure smooth operation

  13. Critical Extreme Position • Only critical points specified (eg., maximum lift) • Must specify actual displacement profile to provide continuous velocity and acceleration and finite jerk

  14. Constant Velocity Profile Simple design and analysis But, horrible dynamic performance

  15. Parabolic Displacement Profile Constant Acceleration Equations for first half of rise: But, infinite jerk

  16. Cycloidal Motion C is determined by setting the maximum displacement equal to L:

  17. Other Profiles Modified Trapezoidal Profile:

  18. Cycloidal Profiles: Rise: C-1 + C-2 = C-5 Fall: C-3 + C-4 = C-6

  19. Harmonic Profiles

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