Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1987-10-09
1989-10-10
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 17, 408 95, B23B 3500, B23B 400, B23B 4700
Patent
active
048727873
ABSTRACT:
In a method of drilling a printed circuit board according to the present invention, an entry feed rate at which a drill is fed into the printed circuit boards during the initial stage of drilling is made slightly smaller than a drilling feed rate at which the drill is fed while it is drilling a hole through the printed circuit boards, so as to enhance the accuracy at which holes are located. One drilling operation includes a plurality of drilling feeds of the drill, and pulled-out positions of the drill which are reached by the drill between adjacent drilling feed rate are set within a range in which the pressure of a pressure foot is effective. This can prevent the stacked printed circuit boards from shifting and increase the accuracy at which the holes are located.
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Aoyama Hiroshi
Arai Kunio
Kanaya Yasuhiko
Nishiyama Hiromi
Hitachi Seiko Ltd.
Howell Daniel W.
Weidenfeld Gil
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