Part 3 - Drilling
Drill the holes for leaded components and the via holes that link the copper layers together. First, we fix the placement of boards on the drilling machine and use a drill to locate targets, and the machine drills registration holes to ensure that we will drill precisely. Besides, the board is covered with protective plate. Second, drilling is processing according to the data input. Third, after drilling is completed, the board will be sent to polish, including edges and surface.
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