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Research Papers: Power Transmissions and Gearing

A Simplified Method for Examining Profile Deviations of Conjugate Disk Cams

[+] 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

1

Corresponding author.

J. Mech. Des 130(5), 052601 (Mar 25, 2008) (11 pages) doi:10.1115/1.2885191 History: Received December 08, 2006; Revised August 29, 2007; Published March 25, 2008

The profile errors of conjugate disk cams can be indirectly examined by means of measuring the conjugate condition of the assembled conjugate cam mechanism. This paper demonstrates how to measure the conjugate condition of the assembled conjugate cam mechanism to reveal the cam profile errors and also develops an analytical approach for relating the variation of the conjugate condition with the cam profile errors. For the machined conjugate cams with profile errors, if the subtending angle of the oscillating follower arms is intentionally changed to be variable, the variation of the subtending angle of the follower arms may indicate the variation of profile errors when the cams rotate. According to the magnitude of the subtending angle variation, the profile deviations of conjugate disk cams can be analyzed analytically. The profile errors of a pair of conjugate cams can be evaluated by means of the corresponding motion variation of the indicator reading. For such an examining method, the only required measuring instrument is a dial indicator. A pair of conjugate cams were examined by the method and also measured using a coordinate measuring machine to test the accuracy and efficiency of the method.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Conjugate disk cams with an oscillating roller follower

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Figure 2

Assembled conjugate cam mechanism with oscillating roller followers

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Figure 3

A conjugate cam mechanism and its equivalent six-bar linkage

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Figure 4

Actual cam profile and theoretical cam profile

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Figure 5

Assembled conjugate cam mechanism and its actual cam profiles

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Figure 6

Mechanical error analysis results of an assembled conjugate cam mechanism

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Figure 7

Subtending angle variation of an assembled conjugate cam mechanism

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Figure 8

Relative variation of the subtending angle with respect to the radial profile errors

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Figure 9

Built assembled conjugate cams with measuring fixture

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Figure 10

Schematic of the experimental apparatus and instrumentation

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Figure 11

Identifying the initial angular position for the cam rotation by using a fiber optic sensor

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Figure 12

Measuring the conjugate cam profiles by using a CMM

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Figure 13

Measuring the subtending angle variation by using a digimatic indicator

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Figure 14

Measured and predicted results of the subtending angle variation

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Figure 15

Measured cam profile errors by using a CMM

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Figure 16

Allowable upper and lower limits of the subtending angle variation

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