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Research Papers

Inspecting Profile Errors of Conjugate Disk Cams With Coordinate Measurement

[+] Author and Article Information
Wen-Tung Chang1

Department of Power Mechanical Engineering,  National Tsing Hua University, Hsinchu 30013, Taiwanwtchang@webmail.pme.nthu.edu.tw

Long-Iong Wu

Department of Power Mechanical Engineering,  National Tsing Hua University, Hsinchu 30013, Taiwan

Kuang-Hua Fuh, Chen-Chou Lin

Department of Mechanical and Mechatronic Engineering,  National Taiwan Ocean University, Keelung 20224, Taiwan

1

Corresponding author.

J. Manuf. Sci. Eng 130(1), 011009 (Feb 06, 2008) (9 pages) doi:10.1115/1.2815348 History: Received April 06, 2007; Revised September 19, 2007; Published February 06, 2008

To inspect cam profile errors, a coordinate measuring machine (CMM) is frequently employed. The coordinate data of discrete points at the cam surface are measured by a CMM in order to further evaluate the actual cam profile with complicated interpolation algorithms, and then the cam contour approximated by these algorithms may be compared with the theoretical one. In this paper, a direct and simple analytical method, instead of a numerical interpolation algorithm, is proposed for inspecting the profile deviations of conjugate disk cams with coordinate measurement data. The method is based on the derived correlation between the radial-dimension errors and the normal-direction errors of conjugate cam profiles. To verify the proposed method, an experiment of inspecting a pair of conjugate disk cam profiles was conducted. The experimental results obtained from the proposed method were compared with those obtained by using the Hermite interpolation method. It shows that this method is accurate and more efficient for inspecting the profile errors of conjugate disk cams.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 4

Conjugate cam mechanism and its actual cam profiles

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Figure 3

Actual cam profile and theoretical cam profile

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Figure 2

Measuring a disk cam profile with a touch-trigger probe

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Figure 1

Conjugate disk cams with an oscillating roller follower

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Figure 9

Comparisons between the proposed method and the Hermite interpolation method for the simulations of an extreme case

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Figure 8

Pressure angles and shift angles of the conjugate cam mechanism

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Figure 7

Evaluated results of profile errors of Cam B

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Figure 6

Evaluated results of profile errors of Cam A

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Figure 5

Experiment for inspecting conjugate disk cam profiles by using a CMM: (a) the CMM used in this experiment, (b) the touch-trigger probe used in this experiment, (c) the inspection of Cam A, and (d) the inspection of Cam B

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