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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

ME321 Kinematics and Dynamics of Machines

Steve Lambert

Mechanical Engineering,

U of Waterloo

cam types
Cam Types

Plate cam with translating roller follower

cam types4
Cam Types

Translating or wedge cam with translating follower

cam types5
Cam Types

Cylindrical cam with translating roller follower

cam types6
Cam Types

Face cam with oscillating follower

translating followers
Translating Followers

(a) Flat-faced (b) Roller (c) Point

oscillating followers
Oscillating Followers

Flat-Faced Roller Spherical-Face

cam design11
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
critical path motion
Critical Path Motion
  • Draw displacement profile through required points
  • Difficult to ensure smooth operation
critical extreme position
Critical Extreme Position
  • Only critical points specified (eg., maximum lift)
  • Must specify actual displacement profile to provide continuous velocity and acceleration and finite jerk
constant velocity profile
Constant Velocity Profile

Simple design and analysis

But, horrible dynamic performance

parabolic displacement profile
Parabolic Displacement Profile

Constant Acceleration

Equations for first half of rise:

But, infinite jerk

cycloidal motion
Cycloidal Motion

C is determined by setting the maximum displacement equal to L:

other profiles
Other Profiles

Modified Trapezoidal Profile:

cycloidal profiles
Cycloidal Profiles:

Rise:

C-1 + C-2 = C-5

Fall:

C-3 + C-4 = C-6