A prototype should answer a defined question. A machined model, an early casting and a production-intent sample can all be useful, but they provide different evidence. Plan the transition to production by documenting what each stage validates and which differences remain.
Define the Purpose of the Prototype
Distinguish a fit or packaging model from a sample intended to validate material, casting quality, machining or functional performance. Record the prototype route and any differences in alloy, temper, geometry, wall sections, surface condition or assembly.
Do not dismiss machining or additive prototypes as inherently wrong. They can support an appropriate development question. Equally, do not use their results as proof of the eventual casting process without checking whether the evidence transfers.
Release the Production-Intent Requirements
Before tooling commitment, agree the controlled drawing/model, material condition, critical features, finish and acceptance package. Identify unresolved design decisions, their owner and their effect on tools and process planning.
A production-intent sample should be described accurately. If tooling, equipment, cores, treatment or finishing still differ from the planned production route, record those differences and the later validation required. A label alone does not make a sample representative.
Connect Tooling, Process and Inspection
| Stage | Main decision | Evidence or open item |
|---|---|---|
| Feasibility | Can a proposed route support the design? | Drawing review, route assumptions and unresolved risks |
| Tooling/trial | Does the tool and process produce the intended geometry? | Trial results, changes and inspection findings |
| First article/pilot | Does the specified delivered part meet the agreed requirements? | Material, dimensional and functional evidence |
| Production release | Are approvals and controls ready for recurring supply? | Customer disposition, control plan and traceability |
| Ongoing supply | Are changes and nonconformities controlled? | Agreed monitoring, records and change notifications |
Plan Machining and Functional Validation Early
RFQ CTA
Have a casting project? Submit the RFQ details, then email your drawing for a structured quote review.
Send the drawing, target alloy, finishing scope, MOQ, and delivery timing. Bohua will review it like a real sourcing project, not a generic contact request.
Mark datums, sealing interfaces, bores, threads and inspection access before tool design is frozen. Agree stock and the order of treatment, machining and finishing. Include handling, cleaning and packaging where they affect the accepted part.
Assign the owner of component, assembly and system testing. Passing one sample test does not automatically approve a changed tool, material, route or drawing. Define the conditions that trigger additional validation.
Use Milestones Instead of a Universal Lead Time
Ask for a schedule tied to drawing release, tooling approval, trial results, sample evidence and customer decisions. Show dependencies and responsibility for each milestone. Separate the requested timing from the supplier's confirmed commitment.
Similarly, define prototype, pilot, release and annual quantities. No universal batch size or annual volume makes one process the best continuation route. Compare the actual tooling, development and recurring scope.
RFQ Package for the Transition
- •Current drawing/model and revision history.
- •Purpose of each prototype or pilot stage.
- •Material, condition and process requirements or proposed alternatives.
- •Critical features and required inspection/functional evidence.
- •Differences from the intended production route and validation still needed.
- •Sample, pilot and production quantities, timing and approval owners.
- •Tooling ownership, change process and quotation exclusions.
FAQ
Must the first prototype use the final casting process?
Not always. Choose the route that answers the development question and state which production claims it cannot validate.
Can the same supplier handle every stage?
That depends on the project and available capability. Confirm the actual route and responsibilities rather than assuming continuity from a sample quotation.
What is the next step for Bohua review?
Send the development objective, drawing, intended production condition and required evidence through the prototype-to-production RFQ form.
Project CTA
Ready to Source This Part?
Submit the RFQ details here, then email your drawing for a structured DFM review and quote.