Production Specification
Manufacturing instructions detailing the material and tolerance requirements of a multi-board substrate array ensure that the board fabricator meets the exact needs of the high-volume assembly line. These panel fabrication notes occupy a dedicated drawing sheet or database layer within the fabrication package. They specify board separation methods like V-scoring or tab-routing, as well as the placement of fiducial marks on the waste margins.
Defining these parameters prevents misunderstanding between the circuit designer and the fabricator.
Assembly Integration
Automated pick-and-place equipment depends on panel-level references to align the substrate accurately during component placement. Clear panel fabrication notes dictate the size and clearance of the global panel fiducials to prevent vision-system errors during high-speed assembly. If the panel notes omit details about the tooling hole clearance or the maximum allowable panel warp, the board can jam in the conveyor or suffer misalignment during solder paste printing.
The instructions also govern the inclusion of breakaway tabs, which must withstand the heat of reflow soldering without losing structural integrity.
Inspection Criteria
Quality assurance departments evaluate incoming panels against the specified dimensional tolerances of the border margins and overall array dimensions. Adhering to the panel fabrication notes guarantees that the fabricated panels fit the standard carrier fixtures of the assembly line.
