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Journal of Mechanical Design | Volume 134 | Issue 8 | Technical Brief
Technical Briefs

A Versatile Acceleration-Based Cam Profile for Single-Dwell Applications Requiring Cam-Follower Clearance During Dwell

[+] Author and Article Information
Forrest W. Flocker

Department of Engineering and Technology,  University of Texas of the Permian Basin, 4901 East University, Odessa, TX 79762flocker_f@utpb.edu

J. Mech. Des 134(8), 084505 (Jul 23, 2012) (7 pages) doi:10.1115/1.4007002 History: Received March 06, 2012; Revised May 23, 2012; Published July 23, 2012; Online July 23, 2012
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Presented in this paper is an asymmetric acceleration-derived cam motion program suitable for single-dwell cam-follower systems with clearance between the cam and follower during dwell. Asymmetric rise and fall is included as this is desirable in certain manufacturing operations and machines that require a quick rise or fall. The motion program for the cam-follower actuation is derived from the follower acceleration so that designers can control the ratio of the magnitudes of positive and negative accelerations. This provides cam designers more control over the cam-follower interface force and therefore more control over factors such as cam wear and the potentially destructive phenomenon known as “follower jump.” The motion program used to close and open the clearance gap is derived from a velocity function, allowing more control of follower inertia during the important clearance closing event. The motion program is presented in closed-form, suitable for implementation in standard engineering equation-solving software.
FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
+A plate cam driving a translating follower
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A plate cam driving a translating follower
Figure 1

A plate cam driving a translating follower

Grahic Jump Location
+Follower position for a single-dwell cam and follower
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Follower position for a single-dwell cam and follower
Figure 2

Follower position for a single-dwell cam and follower

Grahic Jump Location
+Follower acceleration during the rise and fall interval
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Follower acceleration during the rise and fall interval
Figure 3

Follower acceleration during the rise and fall interval

Grahic Jump Location
+Follower velocity for opening ramp
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Follower velocity for opening ramp
Figure 4

Follower velocity for opening ramp

Grahic Jump Location
+Position function for the opening ramp
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Position function for the opening ramp
Figure 5

Position function for the opening ramp

Grahic Jump Location
+Opening ramp velocity functions for three values of nr
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Opening ramp velocity functions for three values of nr
Figure 6

Opening ramp velocity functions for three values of nr

Grahic Jump Location
+Follower position for the illustrative example
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Follower position for the illustrative example
Figure 7

Follower position for the illustrative example

Grahic Jump Location
+Follower pseudo-acceleration for the illustrative example
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Follower pseudo-acceleration for the illustrative example
Figure 8

Follower pseudo-acceleration for the illustrative example

Grahic Jump Location
+Cam profile for the illustrative example using a translating roller follower
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Cam profile for the illustrative example using a translating roller follower
Figure 9

Cam profile for the illustrative example using a translating roller follower

Grahic Jump Location
+Symmetric profile for the illustrative example using a translating roller follower
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Symmetric profile for the illustrative example using a translating roller follower
Figure 10

Symmetric profile for the illustrative example using a translating roller follower

Grahic Jump Location
+Cam profiles for the illustrative example using a translating flat-faced follower
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Cam profiles for the illustrative example using a translating flat-faced follower
Figure 11

Cam profiles for the illustrative example using a translating flat-faced follower

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