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A CAD/CAM system for precision cams with three CNC interpolation methods

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Abstract

Design and manufacture of cams are complicated engineering tasks usually performed independently of each other. Therefore, a CAD/CAM system for cams would be very useful. The mathematical cam profile must be interpolated at some increment to create the numerical data for CNC machining. The interpolation method has significant effects on the dynamic performance. The focus of this paper is to develop a methodology of computer-aided design and manufacturing for precision cams by consideration of three CNC interpolation methods: linear, circular and R-Θ. Various aspects of the features of the interpolation method are explained and compared. The presented software can simulate a roughing and finishing sequence on a given cam blank. The computerised procedure is detailed with accompanying examples.

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Abbreviations

Dp(h):

Jacobian matrix of family at pointp

ℛn :

n-dimensional Euclid space

ρ:

curvature

ϕ:

pressure angle

e :

offset

h f :

family of follower

L :

step length

s :

displacement of the follower

ν:

first derivative of the displacement with respect to cam angle

References

  1. F. Y. Chen,Mechanics and Design of Cam Mechanisms, Pergamon Press, 1982.

  2. A. C. Lin, H. Chang and H. P. Wang, “Computerized design and manufacturing of plate cams”,International Journal of Production Research,26(8), pp. 1935–1430, 1988.

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  3. Z. G. Tzur, M. Shpitaini and S. Malkin, “Design and manufacturing analysis for integrated CAD/CAM of cams”,Transactions of the ASME,111, pp. 307–314, November 1989.

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  4. D. W. John, “Geometric representation of swept volumes with application to polyhedral objects”, PhD thesis, Cornell University, 1987.

  5. H. A. Rothbart,Cams, John Wiley & Sons, 1956.

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Authors and Affiliations

  1. Department of Precision Engineering and Mechatronics, Korea Advanced Institute of Science and Technology, 373-1, Kusung-Dong, Youseng-Gu, 305-701, Taejon, Korea

    Minyang Yang & Chanbong Kim

Authors
  1. Minyang Yang
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  2. Chanbong Kim
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Yang, M., Kim, C. A CAD/CAM system for precision cams with three CNC interpolation methods. Int J Adv Manuf Technol 9, 87–92 (1994). https://doi.org/10.1007/BF01750415

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  • DOI: https://doi.org/10.1007/BF01750415

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