track-width

A routed track is narrower than the loosest common fabrication floor (0.127mm).

Remedy ¶

Widen the track to the fab’s minimum, or move the board to a process quoted for the width you need. Below the floor a trace will not etch reliably at mainstream yields.

What it means ¶

A routed copper segment narrower than 0.127mm (5mil), the minimum trace width of the loosest mainstream fabrication capability (the corpus JLCPCB rule set).

a trace narrower than the fab floor is flagged; an adequate width is fine

Why engineers want it ¶

Track width is the first constraint every fab publishes and every DRC ships. A sub-minimum trace is not a style choice: the fab rejects the board or etches it unreliably.

Impact ¶

Order-time rejection at best; intermittent opens and current failures at worst.

Scope note ¶

The 0.127mm default is deliberately the loosest published floor, so the rule fires on defects rather than on deliberate tight routing under a capable fab’s own rules; per-design thresholds arrive with rule parameterization (WS3-006). Available gates the rule behind the board-geometry tier (a netlist-only design reports “unavailable”, not a silent pass).

Query structure ¶

select nets with any segment below the floor.

select N in board.nets where count(S in N.segments where width(S) < 0.127mm) >= 1

Reads: board.copper. Tier P.