5 drill holes and beer 5.1 in NCD drill all the holes with file as complete aperture, the tolerance +/-3mil. 5.2 when using phenol-formaldehyde resin-based materials (outlined in 4.2.3), need special consideration in the processing procedure, ensure that no residues of the substrate and the hole drilled hole and/or beer without sheet metal layer. 5.3 maximum drill hole wall slot depth cannot exceed the minimum thickness of the copper through-hole (1mil average/0.8mil least, section 6.1 detailing) 5.4 reliable inter-connects shall be present after the process used to minimize resin smear in the hole and the subsequent desmear process. 5.5 all hole centres NCD drills with the file +/-3mil within the specified coordinates. 5.6 all designated for NPTH hole should not contact line and other materials.
小熊猫球球酱
