请各位大侠帮忙看看

我来顶帖来了。哈。

Specifying Copper Plating Thickness for Drill Holes

Use 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<！--Element not supported - Type: 8 Name: #comment--> <！--Element not supported - Type: 8 Name: #comment-->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:

• In the Drill Oversize box, type the value in current design units.

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.

什么问题呢

设置钻孔余量。

具体啥意思还真不清楚，望有识之人解答。关注ING。

这是因为在加工PCB时，是先钻孔然后沉铜加工来使钻孔连通，因此实际的孔要小于你设计的孔的直径大小，这个设置是弥补这个差值的

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