Technical insight
How to Review a CMM Report Against a Released Drawing
When a supplier sends a coordinate measuring machine (CMM) report, start by confirming which item and drawing revision it covers. Use the report together with the approved inspection scope. Do not assume that a document labelled “inspection report” answers every acceptance question associated with the order.
By Geetai Precision
- Published
- Updated
Begin with identity, not the pass column
This guide focuses on reviewing a received record. It complements, rather than repeats, a pre-quotation RFQ checklist. The workflow and examples below are editorial buyer guidance, not a prescribed inspection procedure or a substitute for the responsible technical review.
Link each reported item to the approved definition
ASME describes Y14.5 as a framework for specifying and interpreting geometric requirements on drawings and digital models. That provides context for asking which drawing convention and released definition govern the report. It does not make a particular report compliant merely because the standard is named.
Use a row-by-row reconciliation rather than relying only on a summary status:
| Review point | Question for the supplier or technical reviewer |
|---|---|
| Item identity | Does the report identify the ordered part and the specific inspected item or agreed lot? |
| Revision | Do the drawing, model and report refer to the approved revision? |
| Feature mapping | Can each required characteristic be traced to a drawing reference or approved feature identifier? |
| Reported basis | Are units, nominal requirements and reported values interpretable against the approved definition? |
| Coverage | Are omitted characteristics clearly listed, with their agreed alternative evidence or open status? |
| Exceptions | Are deviations linked to written dispositions rather than hidden by an overall pass label? |
The matrix is a document-review aid. It does not prescribe a CMM program, sampling method or acceptance threshold.
Check the handoff when a digital model was used
NIST distinguishes graphic product manufacturing information, which presents annotations visually, from semantic information that software can interpret. Its STEP resources describe the exchange of this information between design, manufacturing and inspection software.
A practical follow-up is to ask which released file was used to prepare the inspection work and how its requirements were reconciled with the governing definition. A model screenshot or successful file import should not close that question by itself. If the contract uses a model-based definition, ask the responsible reviewer to confirm the agreed interpretation and supporting records.
Separate a documentation gap from a rejected part
Suppose a report covers one bore and two faces, while the approved scope also names another characteristic. Record that as missing evidence requiring clarification. Do not call the omitted feature conforming because the reported features passed; equally, do not declare the physical part defective solely because its supporting record is incomplete.
Ask whether the omitted item was assessed elsewhere, excluded by an approved agreement or left unchecked. Link any supplementary record to the same part and revision. When a supplier corrects a report, retain the original and revised references with an explanation of the change rather than silently replacing the record.
Assign the acceptance decision to the authorized reviewer. Purchasing can organize the evidence and identify gaps, but should not invent a technical disposition to close an administrative task.
Close the review with a specific disposition
Use three clearly documented outcomes: the agreed evidence package is complete and referred for acceptance; clarification is required; or a deviation needs formal disposition. Record the reviewer, date, affected characteristic and reference to the final decision. Keep dimensional evidence separate from any separately specified balancing, cleanliness or application-qualification records.
Related review paths
References
- Y14.5 - Dimensioning and Tolerancing — ASME. Accessed 2026-09-08T04:26:53.104Z.
- STEP File Analyzer and Viewer — NIST. Accessed 2026-09-08T04:26:53.104Z.