Costs, grading and procurement

The cost model combines installed conductor length, purchasing/scrap rules, assembly and declared joint or splice costs. Prices belong to the case; results retain whether they are synthetic, estimated, published or quoted.

Price the winding you actually declared

For a simple scrap model, purchased length is installed length multiplied by 1 + scrap_fraction. Each grade uses its own price per metre. Joint and assembly terms remain in the total even when a candidate uses less conductor.

With a piece policy, the ledger instead buys declared piece offerings and accounts for the resulting splices and remnants. Module boundaries and per-strand purchasing change those counts. Specify them explicitly before interpreting the cheapest offering.

Use grading deliberately

Assign conductor specifications to declared winding regions or permitted interfaces. Each specification retains its own dataset, price and material assumptions. Supply all external dependencies before running a graded case.

A cheaper grade can save material cost while increasing tape count, purchased length or transition costs. Inspect the regional allocation and complete ledger, then compare the same requirement and sampling plan.

Read the procurement outputs

The BOM contains installed and purchased metres per specification, turn ranges, geometry, joints/pancakes and reconciled ledger totals. Piece policies add offering, splice and remnant quantities.

A record without a passing eligible optimum cannot produce a purchasing design. Review export preserves that result with procurement unavailable. A modeled BOM or RFQ summary describes the declared design; supplier availability, lead times, tooling, insulation and splice qualification need their own inputs.

References: grading and BOM/piece policy.