N26-295's PT42 pairs saved spacing in slice 1 but every shared edge was
still cut twice, costing a pass per edge and risking a freed part
tipping under the head on the second pass.
Plan Cutting now cuts a plate's common lines once unless the plate is set
to cut them twice. Each group is cut member by member, owner before
partner (a captured dependency that search and replay enforce, so a kept
order cutting the partner first is a constraint conflict): the member's
holes, then the shared cuts it owns as open CommonLine centerline cuts
entered through the notch on the span's axis, then its remainder pieces,
each ramped in from the kerf the shared cut opened. Capture marks the
shared spans as tabs on the owned clean copy, so replay's contour
accounting proves each perimeter is cut exactly once; a lead that fits
at neither end refuses as UnsupportedGeometry naming the span, never
shortened. Material still comes from the drawing, so utilization,
quantity and overlap results do not change. Members are never
support-tabbed; locked or excluded members and broken groups refuse.
The CI Fiber post writes shared cuts in the cut-off form with a lead-in
and no G41/G42, and remainders in the contour form on their perimeter's
compensation side, named by a remainder comment. Cincinnati CL (whose
PreApplied mode offsets nothing) and Gravograph refuse such nests, as do
the desktop and console for any post without ICommonLinePostProcessor;
nothing falls back to a silent double cut. Plate > Arrange > Cut Common
Lines Twice keeps slice 1's behavior, persists with the plate and makes
an open plan stale.
Pre-post review now checks each span is cut once, on its centerline, by
the member cut first, and the rapid check treats a finished member's
remainders as an obstacle. Compensation start in void and cancel in
kerf are unconfirmed on the CI FIBER 4020; release waits on a 3/16
stainless coupon trial.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Expensive alloy jobs (N26-295, 310 stainless) could not fit their last
PT42 at full part spacing; the plate was squeezed to 0.2 spacing with a
part 0.14 from the edge. Parts whose straight edges face each other one
kerf apart are cut on the same centerline, saving the spacing along each
shared edge.
Plate.CommonLines holds groups of parts and the kerf they were joined
at. Shared spans are derived from the placed clean perimeters, never
stored, so a moved member breaks its group instead of leaving a stale
span. Plate > Arrange > Join Common Line slides the selected parts
together at the plate's kerf; Remove Common Line ungroups them. The
plate draws shared spans as a dashed centerline.
Both spacing checks hold group members to the kerf instead of the part
spacing, and a new pre-post Common lines check reports broken groups, a
changed kerf, and leads that run into a partner. Groups persist as part
positions in an optional commonLines array that older readers ignore.
This first slice still cuts every shared edge twice; single-pass cutting
through Plan Cutting and the posts comes next.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ajandClaude Opus 5.5