Specifying Copper Plating Thickness for Drill HolesUse the Drill Oversize box to specify the amount of space that PADS Layout automatically adds to plated drill holes to account for copper plating inside drill holes. This amount of space is called drill oversize. The drill size plus the drill oversize equals the finished NC drill size diameter. CAM outputs for NC drill reflect the finished size value. Drill oversize also applies to plated via and pin drill holes. You specify whether a via or pin is plated in the Pad Stack Setup dialog box. To specify copper plating thickness for drill holes: Tip: Pads oversize is measured from the center of the pad, not the perimeter. For example, a 3 mil oversize represents 1.5 mils in all directions from the center of the pad. | 
发表于 2008-12-22 10:50:00