A NEW METHOD FOR DRILLING SMALLER THROUGH-HOLES IN PRINTED WIRING BOARDS USING A DIAMOND COATED DRILL

摘要

In the present report, we propose a new method for drilling smaller though-holes in printed wiring boards. First, it was shown that diamond coated drill could drill more than 6 times the number of holes than a conventional drill made of cemented carbide. Second, we evaluated the resin smear on the hole wall, the surface roughness in the hole wall, the internal damage around the hole and the deflection of the hole in terms of FR-4 type printed wiring boards production. It was confirmed that the hole quality drilled with the new drill tool is sufficient from the above results.