A Proposal To Improve High Speed W-C Drills For Printed Circuit Board Based On A Photographic Observation

Tomozo Kawakita; M. Sasaki; H. Kitagawa; K. Mori; K. Shirai

doi:10.1117/12.957698

27 July 1979 A Proposal To Improve High Speed W-C Drills For Printed Circuit Board Based On A Photographic Observation

Tomozo Kawakita, M. Sasaki, H. Kitagawa, K. Mori, K. Shirai

Proceedings Volume 0189, 13th Intl Congress on High Speed Photography and Photonics; (1979) https://doi.org/10.1117/12.957698
Event: 13th International Congress on High Speed Photography and Photonics, 1978, Tokyo, Japan

Abstract

Hard W-C alloy drills used in the production of printed circuit boards must cope with the increasing requirements for higher revolution and feeding speed. Under severe working conditions both the heat and the epoxy-smear generated on the copper conducter surface are apt to be fatal to successful drilling. We clarified the behaviour of drills and drilling chips in various conditions by using a "STROBOKIN" and developed a new method termes as 'back-cut drilling'. By this method we use back-cut drills having special upward blades and during the idle upward feeding period are able to cut off thin layers around a drilled hole and to remove the generated epoxy-smear effectively.

Citation Download Citation

Tomozo Kawakita, M. Sasaki, H. Kitagawa, K. Mori, and K. Shirai "A Proposal To Improve High Speed W-C Drills For Printed Circuit Board Based On A Photographic Observation", Proc. SPIE 0189, 13th Intl Congress on High Speed Photography and Photonics, (27 July 1979); https://doi.org/10.1117/12.957698

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