Cost & Sourcing
Cable Assembly Tooling, NRE, and Engineering Change Costs
Tooling and NRE should be linked to a named purpose, revision, owner, and expected use. A clear cost register distinguishes molding tools, harness boards, test fixtures, applicators, setup, sample work, and engineering changes so the same charge is not misunderstood across project phases.
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Decision summary
What to carry into the decision
- Ask what each non-recurring line creates, which revision it supports, and whether it can be reused.
- Record custody, storage location, maintenance, access, and transfer conditions for physical tools and fixtures.
- Define which drawing or BOM changes trigger a modification, new sample, revalidation, or replacement.
- Keep tooling acceptance separate from acceptance of the cable assembly built with it.
In this guide
- 1Give every non‑recurring line a purpose
- 2Tooling and NRE register
- 3Distinguish common tooling types
- 4Assess every engineering change
- 5Keep tool acceptance and part acceptance separate
- 6Common commercial gaps
Use the sections in sequence, then turn the open items into one controlled build or sourcing package.
Give every non-recurring line a purpose
Do not accept one combined tooling line if it hides several outputs. Split physical tools, production fixtures, test fixtures, programs, sample work, engineering tasks, and separately scoped validation.
Tie each output to the drawing or specification revision used to design it. That makes later change impact easier to explain.
Tooling and NRE register
Keep this register with the quotation and change log.
| Item and purpose | Mold, insert, nest, harness board, gauge, applicator, test fixture, program, sample, or engineering output. |
|---|---|
| Revision and life | Controlled input, expected quantity or use, limits, replaceable elements, and known wear points. |
| Custody and access | Responsible party, location, identification, maintenance, storage, access, permitted use, and transfer terms. |
| Acceptance | Tool or fixture check, sample result, dimensional study, test correlation, and record required before release. |
Distinguish common tooling types
Different tools answer different control problems.
- An overmold tool controls a molded envelope and cable or insert position.
- A harness board or layout fixture controls routing, branch datums, and connector position.
- A test fixture connects the assembly to a defined electrical or functional method.
- Terminal applicators and process tooling must match the terminal, wire, and controlled setup data.
Assess every engineering change
Compare the proposed revision with the tool and fixture functions. A connector change may affect mating nests, overmold inserts, pinout adapters, test programs, and packaging even when cable length is unchanged.
Record the disposition for material already purchased, work in process, finished stock, samples, tools, drawings, work instructions, inspection methods, labels, and shipment records.
Keep tool acceptance and part acceptance separate
A tool can match its design and still produce a part that needs adjustment; a good sample does not prove every tool-life or repeat-production assumption. Define the tool check, first-article check, test result, and production-release decision as separate evidence.
Common commercial gaps
Watch for an NRE line with no deliverable, custody that was never discussed, sample tools described as production tools, maintenance left undefined, or a unit price that includes amortization without the quantity and period stated.
Resolve these points before the purchase order so a later revision does not reopen the original commercial assumptions from memory.