Journal of the Japan Society for Precision Engineering
Online ISSN : 1882-675X
Print ISSN : 0912-0289
Paper
Micro Drilling for Printed Circuit Boards
- Influence of Radial Run-out on Characteristics of Micro Drilling -
Hidehito WATANABEHideo TSUZAKAMasami MASUDA
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JOURNALS FREE ACCESS

2008 Volume 74 Issue 11 Pages 1204-1209

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Abstract

This paper represents the influence of drilling conditions upon centripetal action with radial run-out in the micro drilling of printed circuit boards (PCBs). These were examined experimentally with micro drills of 0.1mm in diameter at a rotational speed of 3 x 105/min. The drilling behavior around contact area on a work surface was observed by a high-speed video camera. The conclusions obtained are as follows: 1) The centripetal action varies with physical properties of work material. The centripetal action is deteriorative in harder work material. 2) The centripetal action depends on feed rate. It is more effective at a lower feed rate, but doesn't depend on the geometry of drill tips. 3) Drilled hole quality is dependent on bending stiffness of a micro drill. The hole quality deteriorates at a higher bending stiffness.

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© 2008 The Japan Society for Precision Engineering
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