Meaning
Quality control systems track the proportion of raw materials or semi finished goods that fail to meet specifications and cannot be reworked. These scrap rate metrics provide a direct measurement of the efficiency of a manufacturing process. They exclude parts that can be repaired or sold at a lower grade and focus only on total waste.
Yield Calculation
Comparing the weight of the final product to the weight of the raw material used reveals the overall effectiveness of the production line. High scrap rate metrics often point to problems with machine calibration or the quality of the incoming supplies. Monitoring these figures allows a plant manager to identify which shifts or machines are underperforming.
Economic Cost
Wasted material represents a loss of both the original purchase price and the energy used to process it. If the scrap rate metrics rise, the cost per unit of the good parts must increase to cover the losses. Reducing this waste is often the fastest way to improve the profitability of a high volume operation.
Process Capability
Precision manufacturing requires that every part falls within a narrow range of dimensions. When the scrap rate metrics are low, it demonstrates that the process is stable and capable of meeting the required tolerances. This stability is a prerequisite for moving from a pilot production run to a high volume manufacturing schedule.
