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TECHNICAL PAPERS

A Procedure for Measuring Planar Cam Profiles and Their Follower Motions

[+] Author and Article Information
Der-Min Tsay, Hsin-Pao Chen

Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan

Kuo-Shu Tseng1

Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan

1

Presently, Engineer with Taiwan Semiconductor Manufacturing Company Ltd., Hsinchu, Taiwan.

J. Manuf. Sci. Eng 128(3), 697-704 (Nov 09, 2005) (8 pages) doi:10.1115/1.2163361 History: Received January 23, 2005; Revised November 09, 2005

A procedure that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy, without the aid of approximating follower displacements in traditional methods, is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the proposed procedure, analytical results generated from a theoretical design are compared to those obtained by the application of the procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the developed procedure with the built measuring test bed are also compared to those obtained by using a coordinate measuring machine with the proposed algorithms.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometric relations between cam and its follower

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Figure 2

Cam with translating roller follower

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Figure 3

Cam with translating flat-faced follower

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Figure 4

Follower motion for theoretical case

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Figure 5

Calculated follower motion

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Figure 11

Follower motion errors evaluated by CMM with proposed algorithms

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Figure 12

Cam inspected by developed measuring system

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Figure 13

Follower motion evaluated by developed measuring system

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Figure 14

Follower motion errors evaluated by developed measuring system

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Figure 10

Follower motion evaluated by CMM with proposed algorithms

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Figure 9

Cam inspected by CMM

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Figure 8

Follower motion for application example

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Figure 7

Schematic illustration of developed measuring system

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Figure 6

Calculated follower motion errors

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