The best time to evaluate a casting supplier is before tooling starts. Once the mold or pattern is made, design changes, machining changes, and inspection changes become more expensive.
Buyer takeaway: the best answer depends on the drawing, quantity, material, machined areas, and inspection requirement. Use the checklist below before comparing quotes.
Signs the Supplier Understands the Part
- They ask about application, material, quantity, machined surfaces, and inspection requirements.
- They point out risk areas such as thin walls, ribs, bosses, sealing faces, and porosity zones.
- They discuss casting and CNC machining together when the final part needs machined features.
- They separate tooling cost, sample plan, production price, finishing, inspection, and packing details.
Questions to Ask Before Tooling
- What process do you recommend and why?
- Which surfaces need machining allowance?
- Where are the likely casting risks on this drawing?
- What inspection will be done for the critical dimensions?
- What happens if the sample needs a design or tooling change?
Warning Signs
- A firm price is given without reviewing the drawing details.
- Machining, inspection, and surface treatment are not included or not clarified.
- All answers sound general, such as high quality, best price, or advanced equipment.
- The supplier does not ask which features are functional.
Related Pages
FAQ
Should price be the first filter?
Price matters, but the first filter should be whether the supplier understands the drawing, process risk, machining requirement, and inspection scope.
What should be confirmed before sample production?
Material, process, tooling plan, machining allowance, key dimensions, inspection method, surface finish, packing, and sample approval criteria.
Send the drawing, material, quantity, machined areas, tolerance notes, inspection requirements, and delivery expectations. We will review the practical casting and machining route before quotation.
