In the digital cutting industry, raw material costs usually account for more than 60% of the total product cost. For enterprises that use genuine leather, carbon fiber or high-end fabrics, even 1% of material waste will add up to a huge cost loss. This is especially true for the genuine leather product and sealing gasket industries, where maximizing material savings is far more important. In such cases, nesting software can play an enormous role.
Why Is Material Waste a Hidden Cost in CNC Oscillating Knife Cutting Machine Processing?
Material Costs Usually Account for 30% – 70% of Total Processing Costs
In the flexible and semi-rigid material processing industry, material costs are often much higher than labor and equipment depreciation costs. According to a report on manufacturing cost structure analysis by Germany’s Fraunhofer Institute, material costs account for more than 40% of total production costs in the custom sheet processing industry (Fraunhofer IPT, Manufacturing Cost Structure Study). Reference source: https://www.ip.tu-berlin.de
This means:
A 5% increase in material utilization rate
Can boost an enterprise’s net profit by more than 10%
The impact is even more significant in low-margin industries
Example:
Suppose an enterprise’s annual material cost is 2 million US
Utilization rate rises from 85% to 90%
Saved material cost ≈ 2 million US × 5% = 100,000 US
In this way, the material cost saved is equivalent to increased profit, and it also offsets the equipment’s depreciation cost to a certain extent.
Limitations of Manual Nesting
Experience-dependent: Skilled workers can arrange materials tightly, while newbies do it loosely. Different operators have different nesting skills, leading to a material utilization rate difference of up to 3%–8%.
High time cost: Nesting hundreds of complex, irregular parts with different shapes manually may take 30 minutes. During this time, the CNC oscillating knife cutting machine is idle, resulting in production capacity waste and disrupting the overall production rhythm.
Difficult to standardize: Nesting quality is greatly affected by the operator’s skills. Humans cannot find the optimal solution every time, leading to large fluctuations in nesting quality and failure to form a replicable nesting process.
Irregular Shapes Are the Main Source of Waste
Special-shaped parts: Such as shoe patterns and car floor mats, which have extremely irregular shapes.
Curved edges: Composed of arcs and spline curves, it’s hard for humans to spot where to fill the gaps with parts.
Mixed nesting of multiple specifications: When nesting large and small parts together, the human brain can hardly process dozens of combination possibilities at the same time.
This results in the corner areas of materials not being fully utilized, creating systematic waste.
What Is Nesting Software?
Nesting software uses advanced computer geometric algorithms to calculate thousands of part arrangement and combination schemes in an extremely short time (usually a few seconds to a few minutes). The software will try to rotate and flip circular, L-shaped and long strip parts at any angle, fitting them into every gap of the material until it finds the scheme with the highest material utilization rate.
What Is the Core Principle of Nesting Software?
How Does the Nesting Algorithm Work?
Multi-angle rotation tests: The software tries to rotate each part by 1°, 5° or any other angle to find the best position to fit into the gaps.
Mirror matching optimization: For symmetrical shapes, the software automatically attempts mirror flipping (e.g., left and right shoe patterns) to find complementary concave and convex positions.
Curved edge fitting calculation: The algorithm accurately calculates the geometric features of part contours to achieve a perfect tight fit (Common Line Cutting), with the gap controlled within 0.1mm.
Path length optimization: It not only arranges parts tightly but also minimizes the tool’s travel path.
Batch graphic combination calculation: It processes hundreds or thousands of parts at the same time to find the global optimum.
Relevant studies point out that the 2D irregular nesting problem is an NP-Hard problem, which is often optimized and solved by heuristic algorithms and genetic algorithms.
For relevant research, please refer to: Bennell, J. A., & Oliveira, J. F. (2008). The geometry of nesting problems: A tutorial. European Journal of Operational Research. https://doi.org/10.1016/j.ejor.2006.12.039
Why Is the Algorithm More Material-Saving Than Manual Work?
Powerful computing capacity: The human brain can only process a few combinations, while a computer can handle tens of thousands per second.
Multi-dimensional parameter optimization: It considers not only area utilization rate but also optimizes the cutting path length.
Strong batch computing capability: It supports processing dozens or even hundreds of different parts at one time.
How Does Intelligent Nesting Improve Cutting Efficiency?
Besides saving materials, the software also optimizes the cutting path:
Common line cutting: Adjacent parts share one cutting line, reducing one cut and improving efficiency by 30%.
Cutting sequence optimization: Cut inner holes first and then outer contours to prevent part displacement; cut small parts first and then large ones to maintain vacuum adsorption force.
Avoid frequent tool lifting: Reduce the idle time of the tool head.
How Does Nesting Software Work with the CNC Oscillating Knife Cutter System?
Take genuine leather cutting as an example: The nesting software automatically identifies and avoids defects (scars, wormholes) on genuine leather, then performs intelligent zoned and graded nesting on the leather. It sends the information of the nesting scheme with maximum utilization rate to a printer, which prints a barcode containing the intelligent nesting information as the leather’s identification. The barcode is then pasted on the leather, and a barcode scanner is used to scan it to transmit the information to the control software system. The CNC oscillating knife cutting machine then executes the cutting task according to the information in the barcode.
How Does the TRUSTER CNC Genuine Leather Intelligent Nesting System Save Materials?
Intelligent Zoned Nesting for Genuine Leather Products
Genuine leather, also known as natural leather (cowhide, pigskin, sheepskin, etc.), is one of the most complex materials in nature. Each piece of leather has a different shape and may have defects such as wormholes and scars.
Defect identification and avoidance: The TRUSTER CNC genuine leather nesting system first scans the entire piece of leather through a CCD vision recognition system. The system can automatically identify and mark defective areas, and manual marking is available if tiny defects are not detected.
Graded and zoned processing: The physical properties of different parts of genuine leather vary greatly (the back leather is of high quality, while the belly leather is loose). As shown in the figure, the system divides the leather into different graded areas such as A (toe cap), B (vamp), C (lining).
Intelligent nesting: According to preset rules, the software arranges high-quality required toe cap parts (blue Area A) on the premium leather, and secondary lining parts (green Area C) on the edge areas.
Result: A nesting scheme with the highest utilization rate is finally generated in the control software. It not only avoids defects but also maximizes leather utilization, increasing the leather utilization rate by about 15%.
Parametric Nesting for Sealing Gaskets
Built-in parameter library: The TRUSTER CNC gasket-specific software has a built-in library of more than 150 commonly used flange and gasket design models. When cutting gaskets, users do not need to draw patterns manually; they only need to input dimensional parameters (e.g., inner diameter, outer diameter, number of holes) to generate graphics.
Complementary nesting (Part-in-Part): As shown in the figure, the software applies the principle of “small circles nested in large ones”, automatically fitting smaller gaskets into the waste holes of larger gaskets or interlocking triangular parts tightly together.
Result: This maximum utilization nesting scheme makes full use of the middle parts that would otherwise be discarded as waste. For the rubber gasket, graphite gasket and sealing gasket industries, it can increase the material utilization rate by 5%–10%.
How Much Material Can Nesting Software Actually Save?
Utilization Rate Comparison: Manual Nesting vs Automatic Nesting
Manual nesting: The average utilization rate is 70%–75%. Restricted by the operator’s proficiency, it is difficult to achieve an ultra-compact arrangement.
Automatic nesting: The average utilization rate can reach 85%–90%, and even higher for regular shapes.
The average improvement range is usually 3%–10%. Data source can refer to public test reports of industry software suppliers, such as SigmaNEST’s official technical white paper. https://www.sigmanest.com/resources
What Does a 5% Increase in Utilization Rate Mean?
Suppose a shoe factory consumes 50,000 square meters of genuine leather every year, with a material unit price of 80 RMB per square meter and a total annual material cost of 4 million US.
A 5% increase in utilization rate brings a saving of: 4 million US × 5% = 200,000 US
From a long-term perspective, it is completely worthwhile for a small enterprise producing gaskets to invest in a CNC oscillating knife cutter equipped with nesting software.
Which Industries Are Suitable for Equipping with Nesting Software?
Genuine Leather Product Industry: Leather shoes, leather bags, wallets, leather jackets, fur coats, genuine leather furniture
Reason: Genuine leather is an irregular natural material with defects and is expensive. Without intelligent nesting to avoid defects and utilize leftover materials, a great deal of material will be wasted and the scrap rate will rise accordingly.
Sealing Gasket Industry: Rubber gaskets, silicone gaskets, graphite gaskets, asbestos/non-asbestos gaskets, PTFE gaskets, paper gaskets, cork rubber gaskets, carbon fiber gaskets
Reason: Gaskets are usually composed of a large number of circular rings of different sizes. The software can realize the nesting of “small circles in large ones” to maximize the material utilization rate.
FAQs
Can nesting software be compatible with my existing CAD design drawings?
Yes. TRUSTER CNC nesting software supports common vector formats such as AI, PLT, DXF, DST, DSB, EPS, DATNC and V CUT. As long as your design software (e.g., AutoCAD, CorelDRAW) can export these formats, the files can be directly imported into the nesting software without redrawing.
Can nesting software really improve the material utilization rate?
Yes. Compared with the average 70% – 75% utilization rate of manual nesting, automatic nesting can usually reach 85% – 90%. Through multi-angle rotation, mirror matching and complementary nesting calculations, the software can test tens of thousands of combination schemes to find the one with the highest utilization rate. In the genuine leather and gasket industries, the utilization rate is usually increased by 5% – 15%.
Is nesting software suitable for irregular materials such as genuine leather?
Highly suitable. For genuine leather, the intelligent nesting system first identifies defective areas, then performs graded and zoned nesting. High-quality parts are arranged on premium leather areas, and secondary parts on the edge areas. This not only avoids defects but also maximizes the use of the entire piece of leather.
Why does the gasket industry need nesting software more than others?
Gaskets are usually made up of many circular rings of different sizes. With manual nesting, the waste in the middle of large rings will be discarded. Nesting software can realize the nesting of “small circles in large ones”, making full use of the originally discarded central areas and thus increasing the material utilization rate by 5% – 10%.
Will automatic nesting affect the cutting speed?
No. The nesting software not only improves the utilization rate but also optimizes the cutting path, reducing the number of tool lifts and idle time. In many cases, nesting optimization can even shorten the overall processing time.
Does nesting software help reduce tool wear?
Yes. Nesting software not only calculates the material utilization rate but also optimizes the cutting path in the following ways:
Common line cutting: Reduces repeated cutting
Fewer tool lifts: Lowers idle movement of the tool head
Shorter total path length: Reduces tool wear
The shorter the path, the less time the oscillating knife runs, and the longer its service life will naturally be. In the long run, this will reduce consumable costs.
Will nesting software increase production complexity?
No, on the contrary, it will simplify the production process.
Example:
In genuine leather cutting, through barcode management:
Scan the leather → Automatically retrieve the nesting scheme → Automatically execute cutting
Operators do not need to manually intervene in complex calculations.
The system automatically completes the whole process:
Identification → Calculation → Optimization → Execution
Making the production process much clearer.
Do nesting software and CNC oscillating knife cutters have to be from the same brand?
Not necessarily.
The key points are:
Whether the software supports common file formats (e.g., DXF, PLT)
Whether it has open interfaces
Whether it can connect with the machine’s control system
If the system compatibility is good, seamless collaboration can be achieved even with different brands.
References and Information Sources
Bennell, J. A., & Oliveira, J. F. (2008). The geometry of nesting problems: A tutorial. European Journal of Operational Research. https://doi.org/10.1016/j.ejor.2006.12.039
Springer. (2014). Accurate prediction of machining feedrate and cycle times considering interpolator dynamics. International Journal of Advanced Manufacturing Technology. https://link.springer.com/article/10.1007/s00170-014-6053-1
Fraunhofer Institute. Manufacturing cost structure research. https://www.ip.tu-berlin.de
