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OpenNest/docs/machine-cutting-defaults.md
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ajandClaude Opus 5.5 bb21ffdf35 feat(machines): split machine leads into outside and inside cuts
Machine Configuration held one lead-in and lead-out per thickness and
applied it to every contour. Each thickness now has Outside Cuts and
Inside Cuts tabs; inside cuts follow the outside leads until "Same as
outside cuts" is cleared, and configurations without inside leads keep
applying one pair to both.

The lead type lists, per-type fields and preview from Cutting Settings
are now a reusable LeadsEditor control that both dialogs use. The
machine tabs hide what the configuration cannot hold: the arc sweep,
the clean-hole kerf (taken from the thickness) and Line + Line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-29 18:51:42 -04:00

3.3 KiB

Machine cutting defaults

A nest's assigned machine (Nest.Machine, see nest file format) supplies the starting lead-ins, lead-outs, kerf and cut-off settings for the nest's material and thickness, from that machine's Tools > Machine Configuration entry (in Database mode, the server's shared machines once it holds them). MachineCuttingDefaults (OpenNest.Data) holds the mapping; the desktop applies it.

Lookup

The machine's material must match the nest's material name, and its grade when the nest has one (otherwise the first grade on file). The thickness matches within 0.001 in after converting the nest's thickness to the machine's units, so a thickness rounded to three decimals (PEP stores 3/16 as 0.188) finds the machine's 0.1875; the nearest one wins. With no match, or no machine on file, nothing changes and the previous behavior applies. Lengths are converted from the machine's units to the nest's.

Lead-ins and lead-outs

A plate with no cutting parameters of its own (Plan Cutting, Place Lead-in) starts from the last applied parameters, as before, with the machine's leads and kerf laid over them and the machine, material, grade and thickness recorded on the parameters. When the last parameters already record the same machine, material, grade and thickness, the machine's settings are not laid over them again, so lead and tab edits made for that job stick; the cutting panel keeps the record (and the kerf) through an edit. Plan Cutting saves its settings as the last parameters as soon as its settings dialog is accepted, not only on Apply. A plate that already has parameters keeps them: changing the machine, material or thickness does not rewrite leads the plate was planned with.

Each thickness holds a lead-in and lead-out for outside cuts (the Outside Cuts tab, external contours) and, optionally, its own pair for inside cuts (the Inside Cuts tab, internal contours, full circles included). Inside cuts use the outside pair until "Same as outside cuts" is cleared, which starts them from a copy of it; configurations saved before the split have no inside pair and keep applying one pair to both. Both tabs use the shared LeadsEditor control that Cutting Settings uses, without the fields the configuration cannot hold (an arc's sweep; a clean hole's kerf, which comes from the thickness). Types map as follows:

Machine type Lead-in
None none
Line line (length, angle)
Arc arc (radius; the default 180-degree half-circle sweep)
Line + Arc line-arc (length, radius, angle)
Clean Hole clean hole (length, radius, the thickness's kerf), inside cuts only; an outside Clean Hole (older configurations) keeps the external lead-in
Line + Line not offered; an older configuration's is not mapped (it has no second segment): the lead-in it would set is kept

Lead-outs map None, Line (length, angle) and Arc (radius); any other type is none.

Cut-offs

The plate view's part clearance, overtravel, minimum segment length and direction come from the machine's cut-off settings when a nest opens, when Nest > Machine changes the machine and after Nest > Edit saves. The head-locked overcut choice is kept. Existing cut-offs are not regenerated at that moment; they follow the settings the next time they regenerate.