Working with Backdrilling in Allegro PCB Designer: Best Practices
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NC Drill and Legend Output
The output of backdrill data can be compared to the way buried/blind via data is output.
Separate Legends and NC Drill files are created for each backdrill pass. While the
dielectric layers are used in the analysis calculations, the NC Drill output will be based
on the conductor layers only.
The fabrication vendor will control the stop depth somewhere in the dielectric layer
adjacent to the conductor layer listed in the NC output. The Drill Legends will report the
actual backdrill sizes as well as the Must Not Cut Layer and maximum depth to Must
Not Cut Layer surface.
Enabling Backdrill Output
The output of backdrill data is controlled by the parameter Include backdrill located in
both the NC Drill and NC Legend forms.
NC Drill dialog
