Calculating Landed Cost Crossover between Flying Probe and Fixture Tooling
Landed cost crossover balances fixture NRE against probe runtime fees, shifting financial advantage to fixtures once batch volume savings offset tooling costs.
Fixture Modification Fee
Commercial Recovery
Tooling adjustment pricing operates as a commercial recovery charge levied by a contract manufacturer when engineering changes require physical alterations to existing test fixtures or surface mount stencil frames. Contract fabrication buyers encounter this non-recurring expenditure whenever component geometry shifts or circuit netlists change after the initial tooling sign-off phase. Commercial buyers negotiate specific cost caps for these engineering alterations during the master service agreement stage to prevent suppliers from inflating post-contract design iteration expenses.
Tooling modification charges cover CNC machining time, new probe placement verification, and manual wiring updates performed by the fixture builder. This financial mechanism applies strictly to hard tooling already accepted by the purchaser and excludes initial fabrication expenses incurred during the pre-production build.
Physical Adaptation
Mechanical routing updates demand precise physical machining of the acrylic or G10 fixture plates to accommodate relocated through-hole components or shifted surface mount lands. Technicians remove existing spring probes and drill fresh receptacle positions into the composite base plate according to the revised computer-aided manufacturing files supplied by the design authority. Electrical continuity verification follows the mechanical reworking process to ensure the newly routed wire wraps maintain correct node connectivity without bridging adjacent test points.
Stencil aperture modifications require laser cutting adjustments on stainless steel foils to alter paste deposit volumes for altered component terminations during subsequent printing cycles.
Cost Allocation
Contractual agreements dictate whether design revisions originate from the customer engineering department or arise from component obsolescence handled by the assembly house. Financial liability transfers to the buyer when engineering change orders alter the functional testing parameters or spatial footprint of the printed circuit board assembly. Supplier quality departments itemize these expenses separately on commercial invoices to distinguish them from unit production pricing and routine maintenance overhead.
Verification delays caused by hardware revisions extend the pre-production schedule and increase total program acquisition costs for the procuring organization.