bherbruck
c1d819f235
Record ownership transfers in the timeline so earlier Join/Cut membership, world placement, machining data and styles survive component moves, edits, independent copying, undo and reopening. Preserve pending positions in history snapshots and keep constructor transfers ordered during feature redefinition. Retain shallow sheet pockets and exact planar intersection islands through unfold/refold, with depth-aware flat previews and DXF export. Store explicit 3D wire coordinate spaces and migrate known legacy provenance without moving saved points or analytic fits. Infer unique eligible cylindrical Emboss targets, align Revolve manipulators with actual extent geometry, and discard obsolete preview errors after input correction. Certify constructed and immutable imported face styles using exact source metadata while preserving legacy face names. Upgrade designs to format10 with bounded validation and geometry-preserving legacy migration.
3.5 KiB
Sheet metal
The SHEET METAL tab builds parts from a sheet of constant thickness under a sheet metal rule
(thickness, bend radius, K-factor), set in Sheet Metal Rules (sheet.manage_rules).
- Flange (
sheet.flange): a base flange from a sketch profile, a contour flange from an open sketch, or an edge flange from a part edge. - Hem (
sheet.hem) and Fold (sheet.fold) along a sketch line. - Unfold / Refold (
sheet.unfold,sheet.refold) for working on the flat part. - Convert (
sheet.convert) turns a solid of constant thickness into sheet metal. - Create Flat Pattern (
sheet.flat_pattern) shows the flat part with its bend lines and a bend table, and exports it as DXF or a bend-table CSV through the save picker.
Bends follow the rule's K-factor, so flat lengths match what a press brake will make. The oracle checks these against parts built in Fusion.
For a shop drawing or spreadsheet, sheet.export_bend_table returns CSV by default; choose
format: "json" for structured data. It includes the sheet rule, thickness, bend angles,
radii, allowances and flat centre-line coordinates. Lengths use millimetres and angles use
degrees. Supply path to save it, or omit path to receive the content through the command
response. body defaults to the last sheet body. Exporting does not add a timeline entry or
consume an undo step.
{"command":"sheet.export_bend_table","params":{"format":"csv","path":"bracket-bends.csv"}}
{"command":"sheet.export_dxf","params":{"path":"bracket-flat.dxf"}}
DXF cutout geometry preserves lines, circles and circular arcs; other curves are sampled
adaptively. The OUTLINE, BEND_UP and BEND_DOWN layers separate cuts from bend centres.
Base-flange profiles keep their interior holes. Through cuts that cross a sheet edge become notches in the flat outline; overlapping and repeated cuts remove their combined area once. The flat preview, DXF and unfolded solid use the same material boundaries. Lines and circular arcs remain exact; other profile curves use a 0.001 mm chord tolerance.
Cuts can leave separate material pieces, including the centre of a ring cut. These pieces remain one logical sheet group through Unfold / Refold and export as separate flat outlines. Large profiles that exceed the geometry processing budget report an error instead of exporting a partial outline.
Parallel, untapered extrude cuts also preserve shallow pockets through Unfold / Refold.
The pocket floor and side walls remain solid geometry; overlapping cuts from opposite sides
become a through hole wherever they remove the whole thickness. Flat-pattern JSON lists
pockets with their side, depth and bottom/top thickness coordinates in millimetres.
DXF pocket boundaries use POCKET_BOTTOM_Z…_TO_…_MM, POCKET_TOP_Z…_TO_…_MM, or
POCKET_INTERNAL_Z…_TO_…_MM layers. These are machining operations, so do not treat every
pocket layer as a through-cut contour when importing the drawing into a CAM tool.
Extrude Intersect on a straight base or an unfolded sheet retains the exact planar material, including interior holes and detached islands. A completely empty intersection removes the sheet and its metadata together. Pocket profiles can move with planar panels when forming, but a pocket crossing a bend zone cannot yet be refolded. Machining folded bend material, tapered sheet cuts and other unsupported 3D sheet Cut/Intersect operations report an error before changing the design; they cannot silently restore removed material during a later sheet rebuild.