Working with Backdrilling in Allegro PCB Designer: Best Practices
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NC Backdrill Legends
Similar to the standard NC Legend, the backdrill legend provides a symbolic
representation of the sites to be backdrilled. The legend table lists the oversized
backdrill sizes used during the backdrill process.
• Drill sizes listed in Legend are the actual backdrill size.
• Must Not Cut Layer and depth to the surface of the Must Not Cut Layer.
• Legend does not specify depth into the adjacent dielectric layer, and is controlled
by the fabrication vendor.
