DSS-P.03.03 — Cutting Skid Lines (factory micro-lines)

Cutting skid lines are fine, short micro-lines generated during score-and-break cutting at the factory (wheel slip or micro-chatter just before/after the primary score). They are usually confined to the edge zone and appear only in raking/oblique views. As a manufacturing artifact, they are not, by themselves, a worked-surface defect on the face. VIS separates observation under controlled lighting/geometry from post-restoration acceptance; treat factory features accordingly.

• Clustered, parallel micro-lines oriented with the cut direction, typically perpendicular to the nearby edge; lengths often a few millimetres.
• Edge-proximate and non-localized (no “worked perimeter” ring).
• Visibility increases under raking light with oblique sweep; a Non-Invasive Reveal (clean & dry) does not materially change the cue.

Surface-catch class (MSRT):

On the face near the edge zone, record SC-0 (none) to SC-1 (slight) only. Perform one light, non-marring pass per VIS §5.5; do not abrade or repeat. On suspected coated faces, prefer a polymer stylus and default to visual cues where any coating risk exists.

Visual signature:

Short, fine, parallel micro-lines confined to the edge zone; no transition edge, no pits/craters, no bright chip flanks typical of mechanical scoring.

Viewing/lighting:

Evaluate at 12 / 36 / 72 in, normal + oblique sweep (~60°-120°) under raking light; surfaces clean & dry.

Location/access:

Log pane ID and surface numbering (#1-#4; laminate-internal) on forms; acceptance pertains to the exposed surface being evaluated.

• Processing feature - not surface damage. If the cue is edge-proximate, uniform, and SC-0/SC-1 with no transition edge or fracture morphology on the face, record “Processing Feature - Not Surface Damage (outside CAT-1...CAT-4).”
• Escalate when:
• Any clear catch with bright chip flanks or extended linear runs across the face → classify under M.01 (linear scoring/tracks) at CAT-3/4 by morphology.
• Indicators show the condition is between panes / inaccessible (fixed parallax in IGU) → CAT-5 by location/condition; refer per project protocol.

Factory cutting micro-lines on the face typically register SC-0 to SC-1 (qualitative), implying very shallow relief (sub-micron to low single-micron range). Numeric depth is not required for classification; use MSRT class and morphology.

• vs. Fabrication-debris (FD) scratches (M.05): FD tracks are longer-run lineations that traverse the face (often bands) and may escalate in catch; cutting skid lines are short, edge-zone micro-lines. (Classify FD under M.05.)
• vs. Abrasion fields (M.02): Abrasion shows directional/web texture with potential SC-1/SC-2 and broader field extent; cutting skid lines remain discrete and edge-bound.
• vs. Coating rub/patchiness (Co.01/Co.03): Coating anomalies are localized changes on the worked surface and are not permitted at acceptance on coated faces; cutting skid lines are manufacturing edge artifacts. Apply VIS §6.2.e for coated surfaces.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; include raking frames. Capture at least one oblique macro showing parallel micro-lines in the edge zone and one context frame showing edge continuity.
• MSRT result: Record SC-0 / SC-1; one pass only, non-marring; on coated faces prefer polymer stylus.
• Forms: Pane ID; product family and surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
• Acceptance split: VIS post-restoration acceptance governs face appearance; do not conflate factory edge artifacts with VIS acceptance criteria.

Attempting to “blend away” factory edge-zone micro-lines onto the face can create a worked region with a visible transition edge, which VIS disallows at acceptance (CAT-0...CAT-4). Keep classification appearance-only unless face damage is present.

• P.03.03 Cutting Skid Lines (Processing Feature) - Edge-zone parallel factory micro-lines observed at VIS geometry; MSRT = SC-0/SC-1 (no/trace relief). No transition edge or chip-flank morphology on the face. Recorded as manufacturing artifact; not categorized as surface damage under VIS-DA. If long, tactile lines with bright flanks extend across the face, classify under M.01 by CAT; if between-pane, record CAT-5 and refer per protocol.