Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
2005-02-22
2005-02-22
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S017000
Reexamination Certificate
active
06857828
ABSTRACT:
A method for drilling a hole in a work piece, such as printed circuit boards, comprises drilling to a point in a work piece and retracting said drill bit a retract distance. The retract distance is configured such that a tip end of said drill bit remains below a top surface of said work piece. The method further comprises drilling a distance greater than said retract distance into said work piece.
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Weber Kurt W.
Wong Warren K.
Yang Chunmig
Excellon Automation Company
Howell Daniel W.
Knobbe Martens & Olson Bear LLP.
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