usefulweb.site Kerfwise Sheet Nesting Optimizer

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Kerfwise Sheet Nesting Optimizer

Nest rectangular parts on sheets with kerf, trim and grain: layouts, yield, offcuts, SVG + DXF.

Parts (required)

Length runs along the grain. Tick grain to forbid rotation (on a grained material).

Parts
#NameLength (mm)Width (mm)QtyGrain
1
2
3
4
5
6
mm

Common sizes: 2800 × 2070, 2440 × 1220, 3050 × 1220, 2500 × 1250, 2620 × 2070, 2750 × 1830, 2800 × 2100, 2440 × 1830, 1220 × 610.

mm

0 = unlimited.

mm
mm
mm
mm

Try an example: 16 panels 600 × 500 on 2800 × 2070 (exactly one sheet) · Base cabinet carcass parts, oak veneer with grain · Plywood 2440 × 1220, mixed parts, MaxRects

How it works

A cutting optimiser for panel saws and CNC routers: list rectangular parts with quantity and grain, choose the sheet size (e.g. 2800 × 2070), saw kerf and trim margin, and get guillotine-cuttable or MaxRects layouts, sheet count, yield per sheet, reusable offcuts, the guillotine cut sequence, SVG drawings and a DXF R12 file.

  • Parts are inflated by one kerf and the usable sheet (sheet − 2 × trim) by one kerf, so neighbouring parts are exactly one kerf apart and the outer parts touch the trimmed edge.
  • Guillotine: free-rectangle packing with best-area-fit / best-short-side-fit and split rules (shorter-leftover-axis, longer-leftover-axis, min-area); every placement records its edge-to-edge cuts, giving a panel-saw cut sequence. MaxRects: maximal free rectangles with best-short-side, best-area or bottom-left fit (tighter, for CNC).
  • Each method runs a fixed set of strategies (4 sort orders × fit/split rules × rotation on/off) and keeps the best: fewest unplaced parts → fewest sheets → least sheet area → largest single offcut → guillotine preferred. Deterministic for identical input.
  • Grain: on a grained material, parts marked grain keep their length along the sheet length; other parts may rotate 90°. Yield = part area / full sheet area. Offcuts = non-overlapping free rectangles ≥ the minimum offcut size.

Heuristic optimisation: good, fast layouts, not a proven optimum. Check that your saw can follow the cut sequence and measure your blade’s real kerf.

Sources

For scripts and AI agents

  • JSON API: POST https://kerfwisesheetnesting.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://kerfwisesheetnesting.usefulweb.site/mcp · tool name kerfwise_sheet_nesting
Example request
curl -s -X POST https://kerfwisesheetnesting.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"parts":[{"name":"Panel","length":600,"width":500,"qty":16}],"sheetLength":2800,"sheetWidth":2070,"kerf":4,"trim":10,"method":"guillotine","grainedMaterial":false}'

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