PLATED HOLES - METALLIZATION
PLATED HOLES - METALLIZATION
For micro-vias, metallization may be important on the minimum space between the holes.
x1: hole diameter before metallization.
y1 : Space between holes before metallization.
x2 : Finished hole diameter (after plating).
y2 : Space inter-hole after metallization.
z : thickness of the metallization.
In the gerber, the holes are always specified in the finished hole diameter.
Hole diameter gerber: x2
Drilling diameter (after offset SAFE): x1
Warning: the minimum distance between holes (Fig VHH2 detail there.) Depends on the thickness of the metallization (Retail z Fig.VHH1 ).
In our example:
B1: FR4 before drilling.
B2: Drilling with compensation. Impossible because overlapping holes.
B3: Finished hole after metallization.
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