In sheet metal manufacturing, raw metal stock (mild steel sheets, stainless 304, aluminium 5052) accounts for 40% to 65% of the total part cost. Maximizing material utilization through intelligent nesting and kerf compensation directly cuts production budgets for hardware startups and industrial fabricators.
Understanding Laser Kerf Width
When an industrial fiber laser cuts through metal, it vaporizes a narrow corridor of material known as the kerf. Depending on optical wavelength, assist gas (nitrogen vs oxygen), and sheet thickness, kerf widths vary:
- 1.0 mm to 2.0 mm Stainless Steel: Typical nitrogen kerf width is approximately 0.15 mm to 0.20 mm.
- 3.0 mm to 6.0 mm Mild Steel: Oxygen-assisted cutting produces a kerf width between 0.30 mm and 0.45 mm.
- Kerf Compensation (CNC Offset): Modern laser CAM software automatically shifts the beam path outward on external contours and inward on internal cutouts to ensure parts match nominal CAD geometry.
Nesting Strategies for Lower Quotes
To reduce scrap during multi-part production runs, consider these practices:
- Common-Line Cutting (Shared Edges): Placing rectangular brackets edge-to-edge allows a single laser pass to cut two adjacent borders simultaneously, saving machine run time and gas consumption.
- Part-in-Part Nesting: Small mounting tabs, washers, and sensor plates can be nested inside the large internal cutouts of chassis baseplates, effectively producing small parts for zero extra material cost.
- Grain Direction Alignment: If parts undergo tight press brake bends, nest them so bend lines run perpendicular to the sheet rolling grain to prevent micro-cracking.
Submit Your DXF Flat Patterns to FamilyMake
As part of our sheet metal beta program, FamilyMake provides automated nesting and instant DFM reviews for DXF and STEP files across West and East Africa.
