--- title: "CMM Inspection Report Checklist: How to Read and Verify a Coordinate Measuring Machine Report (2026)" description: "A CMM inspection report checklist written by a shop that produces them daily. Covers the 6 report sections, a 22-point review checklist, GD&T interpretation, and common issues — with a downloadable PDF." lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://www.olympusmachining.com/#organization", "name": "Olympus Machining LLC", "url": "https://www.olympusmachining.com", "logo": "https://storage.googleapis.com/gpt-engineer-file-uploads/SFKHg3gA6NVscESUCStAZeugW5B3/social-images/social-1762640845290-Olympus-Machining-Gear-Logo_Logo-ONLY.png", "description": "Olympus Machining LLC is a precision CNC machining shop located in Hanover, Pennsylvania, providing CNC milling and CNC turning services for OEMs and manufacturers nationwide.", "telephone": "+17176345094", "email": "info@olympusmachining.com", "address": { "@type": "PostalAddress", "streetAddress": "639 Frederick St, Suite 1", "addressLocality": "Hanover", "addressRegion": "PA", "postalCode": "17331", "addressCountry": "US" }, "sameAs": [ "https://www.google.com/maps/place/Olympus+Machining+LLC" ], "hasCredential": [ { "@type": "EducationalOccupationalCredential", "name": "ITAR Registration — DDTC", "credentialCategory": "Government Registration", "recognizedBy": { "@type": "Organization", "name": "U.S. Directorate of Defense Trade Controls (DDTC)" } }, { "@type": "EducationalOccupationalCredential", "name": "CMMC Level 1 Compliance", "credentialCategory": "Compliance Certification" } ] }, { "@type": [ "LocalBusiness", "ManufacturingBusiness" ], "@id": "https://www.olympusmachining.com/#localbusiness", "name": "Olympus Machining LLC", "image": "https://storage.googleapis.com/gpt-engineer-file-uploads/SFKHg3gA6NVscESUCStAZeugW5B3/social-images/social-1762640845290-Olympus-Machining-Gear-Logo_Logo-ONLY.png", "description": "Olympus Machining LLC is a precision CNC machining shop located in Hanover, Pennsylvania. 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Any missing or inconsistent field is a signal to request a corrected report before accepting the part." } }, { "@type": "Question", "name": "What is the difference between a CMM report and a First Article Inspection (FAI)?", "acceptedAnswer": { "@type": "Answer", "text": "A CMM inspection report is the dimensional data output from a coordinate measuring machine — it documents the measured values of specific features. An AS9102 First Article Inspection (FAI) is a broader qualification package that typically includes the CMM report along with Form 1 (part identity), Form 2 (raw material and special process accountability), Form 3 (characteristic accountability against every ballooned drawing dimension), Certificates of Conformance, and material certifications. The CMM report is one input to the FAI; the FAI is the complete first-article qualification record." } }, { "@type": "Question", "name": "What is a datum reference frame on a CMM report?", "acceptedAnswer": { "@type": "Answer", "text": "A datum reference frame is the coordinate system used to align the physical part to the CMM measurement axes. It is defined on the engineering drawing using datum feature callouts labeled A, B, C (primary, secondary, tertiary). On the CMM report, the datum reference frame section documents which physical features on the part were used to establish each datum and in what sequence — for example, a common alignment is 'Plane, Line, Point' where a face establishes the primary datum plane, an edge or slot establishes the secondary axis direction, and a hole or corner establishes the origin point. An incorrect datum reference frame is one of the most common causes of a failed CMM report." } }, { "@type": "Question", "name": "What does OUTTOL mean on a CMM inspection report?", "acceptedAnswer": { "@type": "Answer", "text": "OUTTOL means 'out of tolerance' and indicates that the measured value of a feature falls outside the tolerance band defined on the drawing. When OUTTOL appears next to a feature on a CMM report, it flags that specific dimension as non-conforming. The report should also show the magnitude of the deviation — how far the actual measured value is from the nearest tolerance limit — so the reviewer can decide whether the deviation is a minor edge case worth investigating or a hard failure requiring rework or scrap." } }, { "@type": "Question", "name": "Does Olympus Machining provide CMM inspection reports?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Olympus Machining produces CMM inspection reports as a standard deliverable on precision CNC machining orders. Reports are generated on our Haas HMM 430 CMM against the customer-supplied engineering drawing, include header traceability, alignment documentation, feature-by-feature measurement data, GD&T results, and inspector sign-off, and are delivered in PDF format. See our CMM Inspection Services page for full capability details." } } ] } ] } ] --- [Home](/) [CNC Milling](/cnc-milling) [CNC Turning](/cnc-turning) [Quality Assurance](/quality-assurance) [CNC Machining Capabilities](/capabilities) [CNC Machining Services](/cnc-machining) [Quality Program](/quality) [Contact Olympus Machining](/contact) [Prototype to Production](/prototype-to-production) [Industries Served](/industries-served) [Materials Machined](/materials-machined) [Robotics & Automation Machining](/robotics-automation-machining) [Precision CNC Machining](/precision-cnc-machining) [Compliance & Cybersecurity](/compliance) [Privacy Policy](/privacy-policy) [Blog](/blog) [Sitemap](/sitemap) [Pennsylvania CNC Machining](/areas-served/pennsylvania-cnc-machining) [Maryland CNC Machining](/areas-served/maryland-cnc-machining) [Virginia CNC Machining](/areas-served/virginia-cnc-machining) [Delaware CNC Machining](/areas-served/delaware-cnc-machining) [New Jersey CNC Machining](/areas-served/new-jersey-cnc-machining) [New York CNC Machining](/areas-served/new-york-cnc-machining) [Ohio CNC Machining](/areas-served/ohio-cnc-machining) [West Virginia CNC Machining](/areas-served/west-virginia-cnc-machining) [Washington DC CNC Machining](/areas-served/washington-dc-cnc-machining) [North Carolina CNC Machining](/areas-served/north-carolina-cnc-machining) [Aerospace Machining Tolerances Explained](/blog/aerospace-machining-tolerances-explained) [Titanium CNC Machining for Aerospace](/blog/titanium-cnc-machining-aerospace) [Aerospace CNC Machine Shop Near DC/MD](/blog/aerospace-cnc-machine-shop-near-washington-dc-maryland) [Cutting-Edge CNC Shop for Aerospace](/blog/cutting-edge-cnc-machine-shop-aerospace-industry) [Best CNC Machine Shop in Hanover, PA](/blog/best-cnc-machine-shop-hanover-pa) [QMS: Precision, Traceability, Process Control](/blog/quality-management-system-qms-precision-traceability-process-control) [Vet a CNC Shop in Pennsylvania](/blog/vet-cnc-machine-shop-pennsylvania-aerospace-defense-robotics) [CNC Shops in Rural America: Hanover, PA](/blog/cnc-machine-shop-rural-america-hanover-pa) [Aerospace CNC Machining in Pennsylvania](/blog/aerospace-cnc-machining-pennsylvania) [CNC Prototyping in PA](/blog/cnc-prototyping-pa) [CNC Machining in Pennsylvania](/blog/cnc-machining-pennsylvania) [Choosing CNC Machining Vendors](/blog/choosing-machining-vendors-cnc-machining-shop) [CNC Machining for Robotics — Guide](/blog/cnc-machining-for-robotics-automation-guide) [CNC Machining Parts for Robotics](/blog/cnc-machining-for-robotics-automation) [Prototype-to-Production CNC Machining](/blog/prototype-to-production-cnc-machining) [How OEMs Evaluate CNC Machine Shops](/blog/how-oems-evaluate-cnc-machine-shops) [CMM Inspection at Olympus Machining](/blog/cmm-inspection-enhances-quality-and-repeatability-at-olympus-machining) [ITAR & CMMC Level 1 in Precision CNC Machining](/blog/itar-cmmc-level-1-precision-cnc-machining) [Precision CNC Machining in Hanover, PA](/blog/precision-cnc-machining-hanover-pa) [AS9102 First Article Inspection Checklist](/blog/as9102-first-article-inspection-checklist) [AS9102 First Article Inspection](/as9102-first-article-inspection) [AS9102 FAI vs PFAI](/as9102-fai-vs-pfai) [AS9102 Balloon Drawings](/as9102-balloon-drawings) [CMM Inspection Services](/cmm-inspection-services) [Medical-Grade Alloys](/materials/medical-grade-alloys) [CMMC Level 1 Compliance](/compliance/cmmc-level-1) [Olympus vs Xometry](/comparison/olympus-vs-xometry) [Olympus vs Protolabs](/comparison/olympus-vs-protolabs) [Direct Shop vs Marketplace](/comparison/direct-shop-vs-marketplace) [Aerospace & Defense Machining](/industries/aerospace-defense) [Medical Device Machining](/industries/medical-devices) [Firearms & Suppressor Machining](/industries/firearms-suppressors) [Energy & Oil/Gas Machining](/industries/energy-oil-gas) [Philadelphia CNC Machining](/areas-served/philadelphia-cnc-machining) [Pittsburgh CNC Machining](/areas-served/pittsburgh-cnc-machining) [Baltimore CNC Machining](/areas-served/baltimore-cnc-machining) [Titanium CNC Machining](/materials/titanium-cnc-machining) [PEEK CNC Machining](/materials/peek-cnc-machining) [Inconel CNC Machining Guide](/materials/inconel-cnc-machining-guide) ![Olympus Machining LLC logo — precision CNC machining shop in Hanover, Pennsylvania](/assets/olympus-logo-DbWcTX06.webp) HomeAboutServices[Blog](/blog)Contact[Careers](/careers)[(717) 634-5094 ](tel:+17176345094)[Login](/auth)Get Quote [Back to Home](/) # CMM Inspection Report Checklist: How to Read and Verify a Coordinate Measuring Machine Report Olympus Machining produces CMM inspection reports every week for defense, aerospace, and medical device customers. This guide is written from the shop side — what actually goes into these reports, what buyers should verify, and where reports most commonly fail. It is designed for engineers, quality managers, and procurement staff who receive CMM reports from a supplier and need to evaluate them without a metrology background. Everything in this guide reflects the practices used on our Haas HMM 430 CMM, verified against AS9102 Rev C and standard aerospace and medical device flow-down requirements. Read it end to end once, then keep the 22-point checklist next to your incoming inspection process — most report defects are caught in the first five minutes of a structured review, long before the part reaches the floor or the assembly line. Last reviewed: May 12, 2026 ## Why the CMM Report Is the Gold Standard for Quality Verification A coordinate measuring machine removes operator interpretation from dimensional verification. Where a caliper reading depends on how hard the technician squeezes the jaws and where on the feature the contact lands, a CMM probes defined points against a programmed path and computes the result mathematically. The same program run by two different inspectors on two different shifts returns the same numbers. That repeatability is why primes, medical OEMs, and defense buyers treat CMM data as the authoritative record when hand-gage data and CMM data disagree. The second reason is traceability. A CMM is calibrated against artifacts whose values trace to national standards through an unbroken chain of documented comparisons. When a report references the machine's calibration record, the measured values inherit that traceability — which is exactly what an AS9100D or ISO 13485 auditor is looking for when they pull a shipped part's inspection package. Third, a CMM can measure geometric characteristics that hand tools physically cannot. True position of a hole pattern relative to a three-datum reference frame, profile of a surface on a contoured aerospace bracket, perpendicularity of a bore to a seating face — none of these are measurable with a micrometer. They require a machine that captures point clouds in a defined coordinate system and evaluates them against the tolerance zones defined in ASME Y14.5. On parts with meaningful GD&T, a CMM report is not a nicer version of hand-gage data; it is the only valid data. [Learn more about our CMM inspection capabilities.](/cmm-inspection-services) ## The 6 Sections of a Professional CMM Inspection Report ### 1\. Header — Part Identification and Traceability - Part number and revision - Serial or lot number - Inspection date and inspector name - Drawing revision and CMM program name - CMM identification and calibration reference The header is what ties the numbers below it to a specific physical part and a specific drawing. A report with a blank revision field is not traceable, no matter how good the measurement data is. ### 2\. Alignment and Datum Reference Frame - The datum reference frame — which physical features establish datums A, B, and C - Common alignment sequences: Plane-Line-Point, or the classic 3-2-1 constraint scheme - Why misalignment produces a false failure In a Plane-Line-Point alignment, a probed face establishes the primary plane and removes three degrees of freedom, an edge or slot establishes the secondary axis direction and removes two more, and a hole or corner fixes the origin. If the programmer picks a different face for the primary datum than the drawing calls out, every position and orientation result downstream shifts — and perfectly good parts get reported out of tolerance. ### 3\. Feature Measurement Table - Columns for nominal, actual, upper tolerance, lower tolerance, and deviation - Reading deviation direction — positive means above nominal, negative means below - OUTTOL flag interpretation on any feature outside its tolerance band Scan the deviation column before anything else. A run of features all deviating in the same direction by a similar amount usually points to alignment or thermal effects, not to individual feature errors. ### 4\. GD&T Results — Position, Profile, Flatness, and More - Position tolerance is reported as the diameter of the true-position tolerance zone, not as separate X and Y offsets - Profile of a surface is reported as total deviation from the theoretical surface, typically bilateral about nominal - Flatness, parallelism, and perpendicularity are reported as single form or orientation values with no plus/minus [See our full GD&T guide for tolerance interpretation.](/resources/cnc-machining-tolerances-gdt-guide) ### 5\. Summary and Pass/Fail Status - Total features inspected - Total out-of-tolerance count - Overall pass or fail determination for the part ### 6\. Sign-Off and Traceability - Inspector name and signature (wet or electronic) - Date and time of inspection - Link back to the CMM calibration record in effect on that date ## The 22-Point CMM Report Review Checklist Work these in order. Items 1–5 cover the header, 6–9 the alignment, 10–16 the feature data, and 17–22 the traceability package. 1. Part number on report matches the drawing being reviewed 2. Part revision on report matches the drawing revision under evaluation 3. Serial or lot number is populated and traceable to the shipped part 4. Inspection date is within the acceptance window for this program 5. Inspector name is present (not left blank) 6. Datum reference frame on report matches the drawing's datum callouts 7. Alignment sequence is documented (Plane-Line-Point or equivalent) 8. Origin point is defined and matches drawing intent 9. No override of the drawing's datum scheme without documented authorization 10. Every characteristic on the drawing appears in the feature list 11. No feature is missing from the report 12. Nominal values on the report match the drawing values 13. Tolerance limits on the report match the drawing tolerances 14. Deviation column is populated (not left blank) 15. No OUTTOL features are marked as passing 16. All GD&T callouts from the drawing appear in the GD&T results section 17. CMM calibration date is within its calibration interval 18. Certificate of Conformance is attached or referenced 19. Material certification is attached or referenced 20. Any special processes (heat treat, coating, passivation) are documented 21. Inspector signature or electronic sign-off is present 22. Report is dated within the required program timeline ### Download the CMM Inspection Report Checklist (PDF) Save the 22-point checklist as a PDF for use in your incoming inspection process. No sign-up required. [Download Free Checklist (PDF)](/downloads/cmm-inspection-report-checklist.pdf) ## 8 Common Issues in CMM Inspection Reports (and What They Mean) 1. **Missing datum reference frame documentation** — without it you cannot confirm the part was aligned the way the drawing intended; treat the report as suspect. 2. **Feature count on report is less than characteristic count on drawing** — characteristics were skipped or the program is out of date; request a corrected report. 3. **Nominal values on report differ from drawing** — almost always a drawing revision mismatch; verify the revision before evaluating any measured data. 4. **OUTTOL feature marked as passing** — either a reporting error or an undocumented deviation; reject the report and escalate to the supplier's quality manager. 5. **Position tolerance reported in Cartesian XY instead of diametric** — a 0.005 in. X and Y offset is not the same as a 0.010 in. diametric zone; request re-analysis in true position. 6. **Temperature not documented** — CMM data taken outside the 68°F ± 4°F environmental spec can be non-compliant on tight-tolerance aerospace work. 7. **Probe compensation not applied** — measurements will read undersized by the probe stylus radius, which quietly biases every internal feature. 8. **CMM calibration expired** — the dimensional data is not traceable to national standards and the report should not be accepted. ## How Olympus Machining Produces CMM Inspection Reports Every CMM report we issue is generated on our Haas HMM 430 coordinate measuring machine, calibrated against NIST-traceable standards on a documented interval. Programs are written directly against the customer-supplied engineering drawing, with the datum reference frame built from the drawing's own datum callouts rather than whatever surface is convenient to probe. Reports are delivered in PDF format and include header traceability, alignment documentation, a feature-by-feature measurement table, GD&T results, a pass/fail summary, and inspector sign-off. CMM reporting is a standard deliverable on every [AS9102 First Article Inspection](/as9102-first-article-inspection) package and is available as an add-on to any CNC machining order. Full capability details are on our [CMM inspection services](/cmm-inspection-services) page, and the surrounding controls are described in our [quality assurance program](/quality-assurance). ## Frequently Asked Questions ### What should a CMM inspection report include? A complete CMM inspection report should include six sections: (1) a header with part number, revision, serial or lot number, inspection date, inspector name, drawing revision, and CMM program name; (2) part setup and alignment information including the datum reference frame and origin sequence; (3) a feature measurement table with nominal, actual, tolerance, and deviation for each characteristic; (4) a GD&T results section with position, profile, flatness, and other geometric callouts; (5) a summary showing pass or fail status and total out-of-tolerance count; and (6) sign-off with the inspector signature and traceability to the CMM calibration record. ### How do you verify a CMM inspection report is accurate? Verify a CMM inspection report by cross-checking six items: the part revision on the report matches the drawing revision under review, the datum reference frame matches the drawing's datum callout sequence, every characteristic on the drawing is accounted for in the feature list, no out-of-tolerance features are marked in-tolerance, the CMM calibration date is current, and the inspector name and date are present. Any missing or inconsistent field is a signal to request a corrected report before accepting the part. ### What is the difference between a CMM report and a First Article Inspection (FAI)? A CMM inspection report is the dimensional data output from a coordinate measuring machine — it documents the measured values of specific features. An AS9102 First Article Inspection (FAI) is a broader qualification package that typically includes the CMM report along with Form 1 (part identity), Form 2 (raw material and special process accountability), Form 3 (characteristic accountability against every ballooned drawing dimension), Certificates of Conformance, and material certifications. The CMM report is one input to the FAI; the FAI is the complete first-article qualification record. ### What is a datum reference frame on a CMM report? A datum reference frame is the coordinate system used to align the physical part to the CMM measurement axes. It is defined on the engineering drawing using datum feature callouts labeled A, B, C (primary, secondary, tertiary). On the CMM report, the datum reference frame section documents which physical features on the part were used to establish each datum and in what sequence — for example, a common alignment is 'Plane, Line, Point' where a face establishes the primary datum plane, an edge or slot establishes the secondary axis direction, and a hole or corner establishes the origin point. An incorrect datum reference frame is one of the most common causes of a failed CMM report. ### What does OUTTOL mean on a CMM inspection report? OUTTOL means 'out of tolerance' and indicates that the measured value of a feature falls outside the tolerance band defined on the drawing. When OUTTOL appears next to a feature on a CMM report, it flags that specific dimension as non-conforming. The report should also show the magnitude of the deviation — how far the actual measured value is from the nearest tolerance limit — so the reviewer can decide whether the deviation is a minor edge case worth investigating or a hard failure requiring rework or scrap. ### Does Olympus Machining provide CMM inspection reports? Yes. Olympus Machining produces CMM inspection reports as a standard deliverable on precision CNC machining orders. Reports are generated on our Haas HMM 430 CMM against the customer-supplied engineering drawing, include header traceability, alignment documentation, feature-by-feature measurement data, GD&T results, and inspector sign-off, and are delivered in PDF format. 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