Planned Loss
Material volume adjustments account for anticipated losses during high-speed surface mount placement. Bill of materials scrap represents the surplus components added to a production order to compensate for machine setup and feeder rejection. This quantity ensures that an assembly run does not stop prematurely due to a shortage of small passives or orientation errors.
Cost Impact
Financial ledgers treat these overages as a direct cost of production rather than a defect. When a pick and place machine handles thousands of components per hour, a small percentage of bill of materials scrap is mathematically certain. If the actual loss exceeds the pre-calculated percentage, the excess becomes a variance that requires reconciliation at the end of the batch.
Excess consumption during the setup of the first feeder or through improper handling of moisture sensitive devices adds to this total. The buyer pays for these items as part of the unit price or as a separate line item to maintain continuous production flow without stoppage.
Reconciliation Boundary
Physical inventory audits at the close of a project determine the finality of bill of materials scrap. Any unused parts from the overage usually return to stock or remain with the contract manufacturer as part of the negotiated yield agreement. The boundary of this scrap category excludes whole-board rejects, which fall under assembly yield losses.
