Verifying Native Source Files in Design Transfer Packages
Verifying native CAD and firmware source files during design transfer prevents unlinked components, build failures, and costly manufacturing delays.
Drill Files
Meaning
Graphic instructions containing coordinate data and tool diameters direct automated drilling machinery during circuit board fabrication. These drill files establish the precise positions of plated through-holes and non-plated mounting points on a printed circuit board. Typically formatted in Gerber or Excellon standards, they act as the primary interface between computer-aided design systems and CNC fabrication routers.
The file defines the exact tooling sequence, hole diameter arrays, and plunge rates required to execute the board layout. Without these instructions, a factory cannot establish the vertical interconnect access points needed for multi-layer routing.
Format Protocol
Data representing hole locations utilize coordinates relative to a shared circuit board origin point. High-frequency boards require tight drill alignment to maintain uniform impedance across transitions. The electronic format contains tool change commands and coordinates that guide the mechanical drill spindle.
Manufacturing Tolerance
Alignment errors during the drilling process can break internal traces or violate the annular ring minimum width requirements. Advanced multi-layer assemblies restrict the drilling offset to a few micrometers to ensure high yields. When drill files are processed, the fabricator adjusts the nominal tool sizes to compensate for the plating thickness added during subsequent chemical baths.
Blind Via
High-density interconnects depend on drill files that terminate at specific internal copper layers rather than passing through the entire stack. These controlled-depth files dictate the precise Z-axis travel of lasers or mechanical bits. Improper calibration results in over-penetration that destroys signal lines on lower layers.