Plan bore quality inspection by characteristic, depth coverage, measurement method and uncertainty before deciding acceptance.
A bore inspection plan needs more than a space for a diameter number. Start by naming the drawing characteristic and the locations at which it must be evaluated. Our editorial distinction is between size, form or position, surface texture and local defects: record the evidence for each requirement rather than treating one result as a substitute for the others.
Editorial planning diagram. Locations are illustrative, not a prescribed sampling plan.
The JCGM Guide to the Expression of Uncertainty in Measurement, sections 3.1.1–3.1.3, begins measurement with a defined measurand, method and procedure and associates the result with uncertainty. Section 3.3.2 discusses contributions including incomplete definition and non-representative sampling. This guide uses those distinctions; the diagram is our own organizing aid, not a replacement for the document.
| Inspection record | Question to answer | Reading route |
|---|---|---|
| Characteristic | Which drawing requirement is being evaluated? | Size, geometry and texture |
| Coverage | Which depths or regions were reached, and which remain unmeasured? | Deep-hole measurement methods |
| Measurement result | What instrument, procedure and uncertainty information accompany it? | Measurement uncertainty |
For example, “diameter recorded near the accessible end” and “diameter requirement evaluated over the agreed depth” describe different evidence. That example contains no assumed tolerance or instrument capability. Record the actual positions and the basis for your sampling plan.
The Novacam turbo-shaft archive case reports both a complete inspection cycle and a shorter acquisition interval. Its reported sorting outcome concerns that inspection task. It is useful for reading a supplier’s timing claim; it does not set acceptance limits or a production yield target for another component.
Use the bore quality acceptance worksheet to connect requirements, coverage, method, results and disposition. Agree the applicable decision rule and responsibility before using the worksheet for a delivery. A filled worksheet organizes evidence; the responsible parties still need to review and approve the result.
The articles below address individual inspection questions. Start with the requirement you need to answer, then choose the method and supporting evidence for that requirement.
Choose your next step
Choose the question you are working on. These links organize the library; they are not machine operating instructions.
Define bore requirements
Deep Hole Drilling Tolerances: Size, Geometry and Texture →Choose measurement methods
Deep Hole Measurement Methods: Air, Contact and Optical →Review measurement uncertainty
Deep Hole Measurement Uncertainty: A Worked Budget →Prepare first-article inspection
Deep Hole Drilling First Article Inspection (FAI) Guide →Review process capability
Deep Hole Drilling Process Capability and SPC →Review monitoring research
AutoBohr Monitoring: What the Completion Report Establishes →Compare deep hole measurement methods by sensing arrangement, bore access, reference scheme and reported coverage; distinguish local diameter checks from …
Read the AutoBohr completion report as attributed drilling-monitoring research, then identify the evidence needed for a new deep-hole installation.
Separate the bore-form characteristics a deep hole has to meet, see why a diametral reading cannot establish any of them, and plan the station intervals …
Build a drawing-linked first-article report with traceable results, unmeasured regions, deviations and an explicit release decision.
Distinguish management-system certification and scoped process accreditation from the inspection evidence for a delivered deep-hole component.
Read deep hole drilling tolerances as separate size, geometry and texture requirements; check tolerance width, units and inspection coverage for the …
Read deep hole measurement uncertainty through an explicitly assumed additive budget, standard versus expanded uncertainty, correlation and the acceptance …
Assess bore capability with stable time-ordered data, explicit Cp/Cpk assumptions and a report that identifies the sampled production conditions.
Examine the accessible MSST/PAT paper abstract and introduction, distinguish roughness classification from a measured value, and retain the remaining …
Evaluate monitoring with identifiable signals, cycle phases, event outcomes and separate bore-inspection evidence.
Assign each secondary operation to its delivered characteristic and distinguish a changed surface from correction of the incoming bore path.
Interpret deep hole drilling straightness using axial coverage, bore-centre observations and the evaluation convention; compare illustrative paths with the …
Separate direct bore measurement from a predicted material-property state, and read controller proposals at the research stage actually reported.