Start with the part, not the machine count
A long, slender shaft and a multi-sided housing need different workholding and machining strategies. A large machine list does not automatically make a shop the right supplier. Put the drawing on the table and ask how the job will actually run.
1–3: Process and technical review
1. Which machine and operation sequence would you use? Ask about the method before the brand. If there are several setups, how will the relationships between features be maintained?
2. Is anything unclear or difficult to manufacture on the drawing? A supplier asking about the function of a critical surface may have thought more carefully about the job than one who asks nothing.
3. Where do material, heat treatment and coating sit in the quotation? Agree who manages subcontracted operations and final inspection.
4–6: Inspection and records
4. How will the critical features be measured? Owning a CMM does not mean every feature can be accessed or checked with an appropriate method.
5. How will first-sample approval work? Set the quantity, report scope and person responsible for releasing production.
6. How will drawing revisions and batches remain traceable? Ask how old and new revisions are kept apart, and confirm that the required records are included in the price.
7–10: Delivery and working together
7. What assumptions support the delivery date? Material availability, sample approval and outside processing may all affect it.
8. What will be retained for repeat orders? Setup information and inspection records should help the next batch benefit from the first.
9. How will a nonconformance be handled? Agree how parts are segregated, investigated and reported. Rework or acceptance of a deviation needs the appropriate approval.
10. What is excluded? Freight, special packaging, certificates and inspection reports can change the comparison substantially.
Look for clear answers
We would put more weight on a realistic explanation than a promise to do everything. A small initial batch can show you how a supplier communicates and approaches inspection. It cannot, on its own, guarantee the quality of every future delivery.
Related guides
- Specifying an inspection report
- Workholding and datum surfaces
- What Determines the Price of a CNC Machined Part?
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