Lean manufacturing in sheet metal processing is centred on identifying and eliminating waste across seven key areas: overproduction, waiting, transportation, excess processing, inventory, motion, and defects. Overproduction leads to excess inventory and increased storage costs while waiting results in idle time for machines, materials, or workers. Unnecessary transportation of materials and products and excess processing add inefficiencies to the workflow. Similarly, excessive stockpiles of raw materials, work-in-progress, or finished goods and inefficient movement of people and materials exacerbate waste. Defects that require rework or result in scrap create additional delays and costs. By addressing these inefficiencies, sheet metal processors can streamline operations, enhance productivity, and achieve significant cost savings