hole-size

A via's drill is smaller than the loosest common mechanical-drill floor (0.2mm).

Remedy ¶

Enlarge the drill to the fab’s minimum. Left as it is, the order is either rejected or the via is silently upsized, and the clearances around it move with it.

What it means ¶

A via whose drill diameter is below 0.2mm, the smallest mechanical drill of the loosest mainstream capability set (the corpus JLCPCB rules).

a via drilled below the fab floor is flagged; an adequate drill is fine

Why engineers want it ¶

Drill size is a hard tooling limit. Below it a fab either rejects the design or substitutes a larger drill, which silently changes annular rings and clearances.

Impact ¶

Order-time rejection, or a board that differs from what was reviewed.

Scope note ¶

Same floor-default posture as track-width; per-design values are WS3-006. Pad through-holes wait on pad-level drill facts; this rule covers vias, where the tiny drills actually happen.

Query structure ¶

select nets with any via drilled below the floor.

select N in board.nets where count(V in N.vias where drill(V) < 0.2mm) >= 1

Reads: board.copper. Tier P.