MANUFACTURING / JAPAN SOURCING
A rubber prototype quotation: what do the tooling and inspection charges cover?
Compare the purpose of the prototype, the proposed tool, the finished sample and the evidence delivered with it. A low sample price does not describe the work still needed for the next decision.
Two quotations may buy different next steps
Imagine requesting moulded rubber feet for a small equipment housing. One offer includes a simple prototype tool and a set of parts. Another includes a production-tool proposal, finishing and a dimensional report. Without those differences beside the totals, the buyer may compare two prices for different work.
Begin with the part drawing revision, intended use, trial quantity and what the sample must establish: shape and fit, a material comparison, or performance of the proposed moulded part. Daiwa Kako’s aluminium-tool brochure gives one example of rubber prototyping for comparison.[1]
Identify the offered compound or material reference and hardness basis alongside the part. If a supplier proposes a machined or printed model, ask what material and process it represents. Fuji Gomu Kasei describes prototype and inspection applications separately.[4] Keep a model for one purpose separate from evidence for the planned moulded material and process.
Identify the tool included in the offer
Ask what tool is included, its intended stage and the product drawing it follows. How many cavities are proposed, where are parting lines or relevant gate marks expected, and which surfaces require particular finishing? Ask the moulder to identify what is included in the trial, what can be adjusted and what would require a separate quotation.
Kyowa Industries discusses compression and transfer tooling in relation to the shape, precision and requirements of the part.[2] Use that as a reason to ask why a route is proposed, rather than choosing solely by the word “simple”. A prototype tool and the eventual production arrangement need an explicit relationship.
- 1Tool: identify its purpose, drawing reference and included trial or revisions
- 2Sample: identify the material, moulding route and agreed finishing
- 3Evidence: connect the sample to the dimensional and functional questions
The sketches identify purchasing scopes. Lines connect the offered items; they do not specify a mould design, manufacturing settings, dimensional limits or approval.
Specify the finished sample and what will be measured
A sample count does not describe whether flash removal, agreed surface finishing or the requested records are included. Identify the appearance areas and functional features that matter to this foot, and ask how the offered finish will be evaluated. The moulder should flag differences from the drawing before the buyer assumes they are covered.
Kyowa’s own tolerance policy distinguishes individual drawing requirements and consultation.[3] Mark the critical dimensions and required limits for the actual part, then agree the measurement method, sample state and reported results with the technical team. Ask how a soft part is supported or held during the proposed measurement so both sides understand the result. Do not substitute an unspecified “standard inspection” for that answer.
| Part of the offer | Identify before comparing | Ask what is included |
|---|---|---|
| Material and sample purpose | Identify before comparingDrawing revision, proposed compound, trial question and quantity | Ask what is includedDifferences from the intended production material or route |
| Tool and trial | Identify before comparingPrototype or production stage, proposed cavities and drawing reference | Ask what is includedTool charge, trial work, permitted adjustments and separate revisions |
| Finished part | Identify before comparingCritical features, parting line and mark areas and agreed appearance | Ask what is includedFlash removal, other finishing and samples for evaluation |
| Inspection and records | Identify before comparingRequired dimensions, methods, sample state and functional questions | Ask what is includedIndividual results, sample IDs, report scope and pending tests |
| Later supply | Identify before comparingRepeat quantity and accepted reference | Ask what is includedTool ownership and storage, maintenance terms and changes needing review |
Keep the sample decision separate from the production order
Ask the responsible design or quality team to record which requirements the identified samples meet and which evaluation remains. A dimensionally acceptable foot has not automatically answered every question about its behaviour in service. Keep the relevant functional evidence with the dimensional and appearance records.
When considering repeat supply, retain the accepted drawing and material, identified reference samples, finishing and evaluation basis. Agree the terms for tool ownership, storage, maintenance, revisions and later production rather than inferring them from a paid tooling line. Ask what changes between the trial and production proposal need further review.
Send HAM the drawing or sample reference, intended use, destination and the quotation questions still open. These make the comparison useful to the Japanese moulder and help show which next step each offer actually covers.
Questions to send your supplier
Open supplier questions
Part/drawing revision, intended use and destination: Prototype question, quantity and repeat-supply expectation: Proposed material or compound, hardness basis and differences from production: Tool stage, cavities, drawing reference and proposed route: Please separate tool, trial parts, finishing, inspection and revision work. Critical dimensions, appearance areas and accepted mark/flash conditions: Measurement method, sample state/support and individual results proposed: Sample IDs, dimensional report, functional evidence and pending tests: Trial adjustments included and work needing a separate quotation: Tool ownership, storage, maintenance and later-supply terms: Accepted reference and changes requiring review:
Sources
- Daiwa Kako — Simple aluminium tooling for rubber prototypes
Read PDF page 1: simple aluminium tooling offered for rubber prototype comparisons. No price, lead time, saving percentage, tool life or capability is adopted as a general promise.
- Kyowa Industries — Types of rubber mould
Read introduction and compression/transfer sections: tooling proposals depend on shape, precision and other requirements. No universal ranking or claim that these cover every rubber-moulding process.
- Kyowa Industries — Dimensional tolerances for rubber products
Read the company-specific tolerance-policy section: individual drawing requirements and consultation. Numerical tables and broad statements about standards are not adopted; no full current standard reviewed.
- Fuji Gomu Kasei — Machining and 3D printing
Read prototype and inspection applications, enquiry flow and dimension-measurement FAQ. Supports specifying prototype purpose and inspection deliverables. No process-wide property ranking, delivery date or material equivalence adopted.