Sheet-metal L-bracket: prompt to part

Modeled 2026-09-01 by Claude driving NativeCAD over MCP (v0.6.0 surface, 84 tools). The entire part below came from one sentence, two accepted recommendations, and one manufacturability follow-up.

The prompt

“Make an L-shaped sheet metal bracket 0.125 inches thick with 4 mounting holes”

What the session decided

The agent asked two clarifying questions; the recommended answers were taken both times: 3×3 in legs, 2 in wide, two holes per leg at Ø0.257 in (1/4 in free-fit clearance). The part was built as a single sheet_fold body — one 90° bend at 1×-thickness inside radius, produced as a real cylindrical face that survives STEP round-trips — with the developed flat pattern computed alongside: a 5.775×2 in blank at K-factor 0.4 from the air-bending R/T table.

The manufacturability pass

The tool-match advisory on each hole flagged Ø0.257 in as off-index for a CNC mill route (nearest stocked drill: 1/4 in). One follow-up rebuilt all four holes at Ø0.250 in with toolMatch:snap, moving them to the tool-matched price tier. The sheet-metal DFM rule pack approved the result: hole diameter 2× material thickness against a 1× limit, internal bend radius pass, watertight, no self-intersections.

Two gaps surfaced and were recorded rather than papered over: hole callouts (Ø6.35 THRU) exist as feature metadata but are not yet serialized into the STEP as semantic AP242 PMI (filed as CADSF-896), and the flat-pattern DXF was refused honestly — the unfolder does not yet develop blanks with holes.

Files

• l-bracket-3x3x2.stepAP242 B-rep solid, written in inches · 53 KB
• Interactive 3D viewerOrbit/zoom, four display modes over the real B-rep edges, fully offline, no dependencies · 74 KB
• l-bracket-3x3x2-hlr.dxfHidden-line-removed elevation — visible edges solid, hidden dashed (ASME Y14.2 convention) · 308 KB

Every number above is kernel-verified from the session transcript: bend allowance 0.2749 in (6.982 mm) at K=0.4, part volume 1.424 in³ (23,334.9 mm³), 18 faces, watertight. NativeCAD ticket ids reference the CADSolver board.