Prototype CNC Machining: First-Article Approval Before Production

Compare the report with the sample identification and inspect the actual mating interface. Record an objective pass or a specific change request rather than a general statement that the sample looks good. Where function depends on the whole assembly, use the buyer's approved test process.

Release production only against the approved revision and acceptance plan. Retain the approval outcome, photographs where useful and any measurement clarifications. A later design change should state whether another first article is required and how any existing stock will be treated.

Material review: the intended production grade should be used when fit, stiffness or service testing depends on its properties. State the agreed designation and required evidence in the purchase specification. Where service performance depends on the material, the design authority must confirm suitability rather than delegating that decision to a generic machining quotation.

Geometry review: focus on test-critical interfaces, realistic tool access and features that may change when moved to batch production. Inspection should address identified critical features measured against the frozen prototype revision, with deviations recorded explicitly. Resolve any feature outside the confirmed measurement scope before ordering, and use the same drawing interpretation for the sample, production report and receiving checks.

Delivery protection: protect fit-test surfaces and identify revision and sample status on each delivered part. Identify the part and revision on the delivered batch. Damage, a material mix-up or an unclear report can prevent an otherwise dimensionally acceptable part from entering the assembly.

For a review of prototype cnc machining, include test objective, current revision, acceptable temporary deviations, quantity and intended production demand. Upload a dimensioned PDF with its revision and a matching STEP or IGES model when available. Add sample and batch quantities, required documents and the delivery destination so the offer can separate technical scope from logistics.

Precision Machining India holds ISO 9001:2015 and uses LMW, Jyoti and Ace Micromatics turning centres, a 3-axis Ace Micromatics FANUC VMC and Mitutoyo inspection instruments. This does not imply AS9100, ISO 13485 or 5-axis capability. Any additional process or specialised test must be reviewed and confirmed separately. Request an NDA before sharing confidential drawings when needed, then use the quotation form to begin the part-specific discussion.