Drill
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United States of America Patent
Stats
-
Dec 31, 1985
Grant Date -
N/A
app pub date -
Jun 6, 1983
filing date -
Jun 6, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The drill invention relates to forming holes in circuit boards and the like. Smoother holes may be formed faster by reducing tendencies of drills to chip. The drill (11) employs primary and secondary reliefs (28,29) behind cutting lips (27) to provide lesser and greater clearances, thereby strengthening the cutting lips' outer edges. The margins (10) having lengths variable in width (20,21) and variable in helix angle (22,23) facilitate the foregoing.
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