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38 PCB007 MAGAZINE I NOVEMBER 2025 A Method to Create the Shape of the Edge For example, there is a machine with a configura- tion that includes an X-ray source. The sophistica- tion of the flash-removal process in that machine is found in the unique design of the cutting tool and its synchronized machine functions. The flash-cutting process, edge beveling, and corner rounding are all performed by one special- ized tool in a single pass. The tool has a unique shape designed to aggressively destroy the flash, turning it into fine dust particles rather than large debris strips. This minimizes the risk of contamina- tion in subsequent plating baths. Simultaneously, the tool creates a clean, beveled edge, and a final chamfering pass rounds the corners. The entire machine operation is governed by a thickness measurement device that accurately measures the panel thickness at the point of cut- ting. This compensation ensures that the tool cuts consistently relative to the actual panel thickness, minimizing variations and maximizing the accuracy of the final edge shape, essential for uniform quality. Summary The success of high-end PCB fabrication often hinges on processes that seem small and "invisi- ble." While small-volume manufacturers might find it difficult to justify a dedicated flash-cutting system, it is a necessary investment for mid-sized and/or high-end production lines might find that investing in a precise flash-cutting system is an investment in yield and stability. Ultimately, many factors influence the result in the PCB process: machines, processes, materials, operators, process engineers, supporting chemi- cals, tools, room conditions, and more. Improving each factor allows companies to gradually enhance overall quality, micron by micron, improve accuracy, and steadily improve stability and yield day by day. PCB007 Simon Khesin is the key account manager at Schmoll Maschinen GmbH. Read his past columns, here. ▼ D R I V I N G I N N OVAT I O N F i g u r e 4 : C o r n e r o f t h e m u l t i l a y e r p a n e l a f t e r t r i m . ▼ F i g u re 3 : M u l t i l aye r p a n e l af te r f l a s h c u t t i n g . ▼ Figure 2: Routing tool used in the flash-cutting machine.