annular-width

A via's annular ring is thinner than the loosest common fabrication floor (0.075mm).

Remedy ¶

Enlarge the pad or reduce the drill until the annular ring clears the fab’s floor with tolerance left over for drill wander.

What it means ¶

A via whose copper ring, (pad diameter minus drill) / 2, is below 0.075mm, the loosest mainstream floor (the corpus JLCPCB rules).

a via with a thin copper ring is flagged; an adequate ring is fine

Why engineers want it ¶

Drills wander within tolerance; the annular ring is the margin that keeps a wandered drill inside its pad. Too little ring means breakout: the barrel tangent to (or outside) the pad edge.

Impact ¶

Intermittent or open via connections that pass visual inspection.

Scope note ¶

Same floor-default posture as track-width; per-design values are WS3-006.

Query structure ¶

select nets with any via whose ring is below the floor.

select N in board.nets where count(V in N.vias where annular(V) < 0.075mm) >= 1

Reads: board.copper. Tier P.