The CI Fiber post selected G42 for every perimeter. Cincinnati's CNC Codes
Handbook defines G42 as "product remains on the left", and imported
perimeters run clockwise with the part on the right, so the controller
offset every outside edge into the part: parts came out a kerf undersize.
Cincinnati's LaserNST samples only use G42 because they cut perimeters
counter-clockwise.
Winding is normalized only at DXF import, so the post can't assume a
direction either. It now takes the largest contour as the perimeter (as
ShapeProfile does) and picks G41 or G42 from each contour's actual winding.
That also stops a reversed drawing from swapping the L2/L4 lead-in macros.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
New post-processor plugin OpenNest.Posts.CincinnatiCIFiber for the CI
Fiber laser family (nLight CLX / Beckhoff TF5200 / Precitec ProCutter,
e.g. the CI Fiber 4020 8kW). Named by machine family, not table size.
Emits the machine program contract of the Cincinnati-supplied sample NC
(12992-4SS_NEST.nc): V.E.* header, restart jump, per-part V.E.R4 blocks,
per-contour N labels with V.E.R3, skippable /L macro lines (L0/L2+G41
interior, L4+G42 exterior, L6 cut-on, ZHSOFF cut-end), G162 incremental
arc I/J, trimmed 3-decimal spaceless coordinates, CRLF, M50/M30/%.
Contour classification (interior vs exterior) derives from the material
side of the closed cut path, not hardcoded winding. SubProgramCall holes
are flattened to sheet coordinates (rotation-safe). Arc lead-ins are
rejected per TF5200 13.2.4.1 (first motion block after G41/G42 selection
must be linear). Table envelope (default 160.25 x 81.25 in) validated.
Tests: structure golden on a square-with-hole nest, rotated-hole flatten,
coordinate format, arc-lead-in rejection, table validation, suppressed/
scribe skipping, plus a SkippableFact regression against the real sample
NC (109 parts, 2071 contours, L2=1962, L4=109, perimeter vertices match
within 0.001). Fixtures configure through OpenNest.Tests/test-config.json
and the regression skips when absent.
ajandClaude Opus 5.5