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- W625405762 abstract "The present paper investigates the characteristics of drill damage and hole quality when microdrilling printed circuit boards consisting of laminated layers of glass-fibre reinforced resins and copper. A CNC-based microdrilling apparatus is developed for this purpose. It is found that the feed pattern and feed rates play an important role in the efficiency of the drilling. An optimum cutting feed rate satisfying the minimum-cost criterion is evaluated using the Taylor tool-life equation. To investigate hole quality a method of measuring instantaneous drill temperature is proposed and temperature rise is compared with a finite-element result. The maximum temperature is limited to below 150 °C because the copper inserted between the epoxy layers plays an important role as a good heat sink. An SEM observation and the temperature consideration lead to the conclusion that resin smear does not take place under the recommended cutting conditions." @default.
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- W625405762 date "1999-06-30" @default.
- W625405762 modified "2023-09-23" @default.
- W625405762 title "Characteristics of Drill Damage and Hole Quality in Microdrilling of Printed Circuit Boards" @default.
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