4. Place the decisive dimensional control and expose what it still lacks

The supplied requirement concerns the bore after coating, because that is what the assembly receives. SYSE.28 places the decisive dimensional control after the last operation that can alter that property and before reliance by the receiving assembly.

A pre-coating measurement can still guide machining and detect an upstream problem. It cannot, by itself, establish the finished bore’s conformity. The supported path must preserve which physical subjects each observation concerns.

In this case no qualified finished-part measurement chain, applicable uncertainty result or receiving decision rule has been supplied. The path can identify where to place the control, which parts to measure, what measurement result is needed and which dependent action must wait.

For example, a returned number of 20.010 mm without the applicable procedure, uncertainty and subject identity is not yet the required conformance decision. Use the qualified measurement and acceptance Methods for the actual operation to select any required tolerance guard band and sampling plan.

The Suite already supplies parts of that construction. PHY.9 helps construct the measuring interaction; C.16.MR/IR relate its recorded result to values compatible with the stated error constraints. The instrument, material, procedure and applicable error account must still be supplied for this bore. For statistical inference under a probability model of the records, use MMP.13, retaining the meaning of its uncertainty statement.

In a separate stipulated calculation, the identified finished bore reads 20.014 mm and the complete error is bounded by ±0.008 mm. Its compatible diameters are [20.006, 20.022] mm. That interval includes values inside and outside [19.980, 20.020], so this observation does not settle conformity. If an applicable procedure instead supplies a complete hard bound of ±0.004 mm for the same reading, the interval becomes [20.010, 20.018] mm and lies inside the specification. These are hard bounds, not confidence intervals. Whether obtaining a different measurement is worthwhile depends on the receiving decision and the cost of changing its answer; use C.11.DUA when that choice is unresolved.

This calculation concerns the stated part and error model. Acceptance of a lot also needs its applicable decision and sampling rules.

The immediate stop is precise: no acceptance claim for the finished lot from this incomplete evidence. Independent work on the interface, provider commitments or test preparation can continue.