Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1995-05-01
1996-06-25
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
36447402, 36447415, 408 2, 408 13, 408 16, B23B 3500, B23B 4100
Patent
active
055294413
ABSTRACT:
A system and method for optimizing drill coordinates in a multi-layer printed circuit board, to correct for interlayer shift during lamination. A set of test patterns, in the form of a cross formed by two orthogonal conductor lines, are defined at each corner of each layer in the same nominal location. Under ideal conditions, the test patterns of the layers in each corner are lined up one above the other, without any offset. A counter sinking tool is used to cut a conical bore in the location of the test patterns, so that every test pattern cross is interrupted in four places, generating a four segment pattern in each layer. A high resolution camera is placed above the countersunk bore to form a single image of the exposed segment edges of all the test patterns exposed by the bore. The image is analyzed to determine the amount of shift of each layer. If all patterns are perfectly concentric, all crosses are perfectly aligned. By measuring the shift of each pattern from the nominal position, the amount of shift in each layer is determined. The process is repeated for the test patterns at each corner of the board, and the resultant layer shift data is processed to optimize the drilling pattern for the board.
REFERENCES:
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patent: 4790694 (1988-12-01), Wilent et al.
patent: 5111406 (1992-05-01), Zachman et al.
patent: 5347462 (1994-09-01), Okuda et al.
"Multilayer Measuring/Drilling Machine MLV 92," Wessel GmbH, Germany.
Proposal for Feature Measurement Drilling machine, Dynamotion Corporation, 1991.
"CNC-Precision Drilling and Routing Machine LBA 805," Wessel GmbH, Germany.
Kosmowski Wojciech B.
Rudolph John M.
Cybernetics Products, Inc.
Howell Daniel W.
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