ME321 Kinematics and Dynamics of Machines

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Presentation transcript:

ME321 Kinematics and Dynamics of Machines Steve Lambert Mechanical Engineering, U of Waterloo 11/28/2018

Cam Design 11/28/2018

Cam Types Plate cam with translating roller follower 11/28/2018

Cam Types Translating or wedge cam with translating follower 11/28/2018

Cam Types Cylindrical cam with translating roller follower 11/28/2018

Cam Types Face cam with oscillating follower 11/28/2018

Translating Followers (a) Flat-faced (b) Roller (c) Point 11/28/2018

Oscillating Followers Flat-Faced Roller Spherical-Face 11/28/2018

Positive Return Follower 11/28/2018

Cam Design 11/28/2018

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 11/28/2018

Critical Path Motion Draw displacement profile through required points Difficult to ensure smooth operation 11/28/2018

Critical Extreme Position Only critical points specified (eg., maximum lift) Must specify actual displacement profile to provide continuous velocity and acceleration and finite jerk 11/28/2018

Constant Velocity Profile Simple design and analysis But, horrible dynamic performance 11/28/2018

Parabolic Displacement Profile Constant Acceleration Equations for first half of rise: But, infinite jerk 11/28/2018

Cycloidal Motion C is determined by setting the maximum displacement equal to L: 11/28/2018

Other Profiles Modified Trapezoidal Profile: 11/28/2018

Cycloidal Profiles: Rise: C-1 + C-2 = C-5 Fall: C-3 + C-4 = C-6 11/28/2018

Harmonic Profiles 11/28/2018