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Proceedings Paper

A Proposal To Improve High Speed W-C Drills For Printed Circuit Board Based On A Photographic Observation
Author(s): Tomozo Kawakita; M. Sasaki; H. Kitagawa; K. Mori; K. Shirai
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Paper 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.

Paper Details

Date Published: 27 July 1979
PDF: 4 pages
Proc. SPIE 0189, 13th Intl Congress on High Speed Photography and Photonics, (27 July 1979); doi: 10.1117/12.957698
Show Author Affiliations
Tomozo Kawakita, Sagami Institute of Technology (Japan)
M. Sasaki, Sagami Institute of Technology (Japan)
H. Kitagawa, Sagami Institute of Technology (Japan)
K. Mori, Sagami Institute of Technology (Japan)
K. Shirai, Sagami Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 0189:
13th Intl Congress on High Speed Photography and Photonics
Shin-Ichi Hyodo, Editor(s)

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