What buyers should verify first
A reliable decision starts with evidence that matches the drawing, production volume and business risk. Use the table below during RFQ review; replace assumptions with named documents, owners and acceptance criteria.
| Review area | What good control looks like | Buyer action |
|---|---|---|
| Technical review | Drawing, CAD, CTQs and open questions closed | Buyer response time matters |
| Material/tooling | Stock confirmation and special tools | Verify before PO |
| Manufacturing | Setup, cycle time, queue and rework allowance | Capacity based |
| Finishing/inspection | External process plus final acceptance | Common bottleneck |
| Logistics | Pickup, linehaul, customs and final delivery | Incoterm dependent |
1. Freeze inputs before counting days
The schedule should start after the supplier has the approved revision, material, finish, quantity and inspection requirements.
For sourcing approval, convert this point into a written requirement: identify the responsible party, evidence to retain, acceptance rule and response when the rule is not met. This keeps a sample success from being mistaken for a capable production system.
2. Ask for a dated milestone plan
Separate material ready, first-off approval, machining complete, finish return, inspection release and carrier pickup. This exposes the real critical path.
For sourcing approval, convert this point into a written requirement: identify the responsible party, evidence to retain, acceptance rule and response when the rule is not met. This keeps a sample success from being mistaken for a capable production system.
3. Distinguish sample and batch capacity
A rapid first part does not prove the remaining quantity can run at the same rate. Confirm machine allocation and daily output.
For sourcing approval, convert this point into a written requirement: identify the responsible party, evidence to retain, acceptance rule and response when the rule is not met. This keeps a sample success from being mistaken for a capable production system.
4. Choose freight by business impact
Compare air, courier and ocean options using required arrival date, shipment size, customs handling and inventory cost—not freight price alone.
For sourcing approval, convert this point into a written requirement: identify the responsible party, evidence to retain, acceptance rule and response when the rule is not met. This keeps a sample success from being mistaken for a capable production system.
5. Build a recovery path
Reserve material, qualify an alternate finishing source, split urgent quantities or pre-book freight when a missed date would stop an assembly line.
For sourcing approval, convert this point into a written requirement: identify the responsible party, evidence to retain, acceptance rule and response when the rule is not met. This keeps a sample success from being mistaken for a capable production system.
Practical buyer scenario
For 500 anodized housings, finishing and final cosmetic sorting may control the schedule more than milling. A useful plan shows the finish supplier slot and inspection release date.
The useful output is a controlled plan, not a promise. Record the drawing revision, assumptions, open questions, required evidence and approval gate in the RFQ or purchase order. For critical applications, obtain engineering, quality and regulatory review appropriate to the product.
RFQ checklist
- Controlled 3D model and 2D drawing with matching revision
- Material grade, condition or temper, and any certificate requirement
- Quantity per release, annual demand and target delivery date
- Critical-to-quality characteristics and agreed measurement method
- Surface finish, cosmetic zones, masking and post-finish dimensions
- Packaging, labeling, Incoterm and destination
- First-article, sampling, traceability and corrective-action expectations
Frequently asked questions
When does lead time start?
Define it contractually—normally after technical approval, payment condition and material confirmation.
Can production and shipping overlap?
Split shipments can help, but they increase freight, customs and lot-control work.
Why does a repeat order take time?
Material, capacity and external-process queues still exist even when the program is proven.
What delay buffer is sensible?
Base it on project risk and the weakest milestone, not a universal percentage.
Sources and further reading
Technical note: Examples in this guide are planning guidance, not a universal manufacturing specification. Final capability, certification, tolerances, treatment and acceptance criteria must be confirmed for the exact drawing and contract.
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