The optimal Cable Tray Manufacturing Process is a continuous, highly automated operation that transforms heavy-duty metal coils into NEMA-compliant electrical support systems using decoiling, leveling, servo-punching, roll forming, and flying shear technologies. Before diving into the machinery, it is important to understand why the production flow matters. Understanding the. Producing cable trays involves a detailed and precise process aimed at creating a robust and efficient system for managing electrical cables. Cutting and Stamping: After the raw materials are prepared, cutting is carried out first. Use a CNC punching machine for mounting holes, slots, louvers and repeated patterns; use a press brake for flanges, brackets, elbows, tees and reducers;.