Nesting
What is nesting?
Nesting is a computer-assisted method in which parts to be cut or punched are optimally arranged on raw material, such as a sheet, to minimize material waste. In the manufacturing industry, nesting is a key part of CNC-controlled production, especially in laser cutting, plasma cutting, and sheet metal machining centers. The goal is to maximize material usage, shorten cutting time, and improve the overall cost efficiency of the machining process.
Nesting in the Manufacturing Industry
At the machine shop, nesting most often relates to sheet metal fabrication, where multiple parts of different shapes are cut from a single sheet. Without optimized placement, a large portion of the sheet's surface area can go unused. Modern CNC methods and CAM programming utilize nesting algorithms that interlock the parts to minimize waste and increase sheet utilization.
Laser cutting, plasma cutting, oxy-fuel cutting, and sheet metal centers use numerical control (NC and CNC), where nesting software generates NC code directly suitable for the machine. This way, a CAD model is directly transformed into a production-ready cutting plan.
Nesting Software and CAD/CAM Integration
Nesting is typically performed using dedicated nesting software or as part of CAM software. The software usually reads CAD formats like .dxf, .dwg, or .step files and creates a cutting plan based on them. Advanced solutions take into account freeform shapes, holes, and inner cuts—this is known as profile nesting, not just rectangular block nesting.
Nesting software can also account for the limitations of the chosen machining technique. In oxy-fuel and plasma cutting, the kerf width and minimum distances are considered; in sheet metal centers, the tool sizes and clamping points are taken into account. Additionally, material properties—such as grain direction, surface quality, or potential defect areas—affect how the pieces are laid out.
1D, 2D, and 3D Nesting
Nesting can be divided into different dimensions based on the types of parts being optimized.
- One-dimensional nesting is used, for example, when cutting bars, pipes, or profiles, where the aim is to minimize the number of scrap pieces.
- Two-dimensional nesting is the most common in the manufacturing industry and concerns the optimization of sheets. It can be based on either rectangular pieces or complex profiles.
- Three-dimensional nesting, on the other hand, applies to things like 3D printing or packaging optimization, where the spatial arrangement of parts affects batch efficiency. In additive manufacturing, changes in part height and collision risks must be considered differently than in traditional sheet cutting.
Nesting and Material Efficiency
With rising material costs, nesting is an increasingly important part of a machine shop's cost structure. Even a small improvement in sheet utilization can result in significant annual savings. At the same time, reduced material waste supports sustainability goals.
However, it's important to note that simply aiming for maximum utilization rate is not always optimal overall. Excessive use of filler parts can increase manual work, storage needs, and production workload. That's why nesting should be viewed as part of the whole production process, including ERP systems, inventory management, and supply chain.
Nesting as Part of Digital Manufacturing
In a modern machine shop, nesting is not a separate phase but part of a digital production chain. CAD design, CAM programming, CNC control, and ERP systems form a unified whole where data transfer and automation enable real-time monitoring.
Automated reporting, utilization tracking, and data analysis help shops improve production efficiency. Nesting data can also be used as a tool for Lean practices and continuous improvement.
Summary
Nesting is a computer-aided optimization method used in the manufacturing industry to arrange parts to be cut as efficiently as possible on raw material. It improves material utilization, reduces waste, and supports cost-effective CNC machining. When implemented properly, nesting is a central part of a modern, digital, and competitive machine shop.
