Notes on dimensioning, ISO tolerances, GD&T and first article inspection.https://www.cote-cote.comen-GBhttps://www.cote-cote.com/en/blog/iso-286-fits-to-numerical-limitshttps://www.cote-cote.com/en/blog/iso-286-fits-to-numerical-limitsHow to go from an H7 or h7 read on a drawing to the two limits in millimetres you actually inspect, with the method, IT values and a full example.Wed, 22 Jul 2026 00:00:00 GMTISO 286tolerancesinspectionThe CoteCote teamhttps://www.cote-cote.com/en/blog/fai-report-concession-as9102https://www.cote-cote.com/en/blog/fai-report-concession-as9102A practical guide to handling a concession on an AS9102 FAI report, filling in Form 3 and the corrective actions to approve.Wed, 24 Jun 2026 00:00:00 GMTAS9102FAIconcessionqualityThe CoteCote teamhttps://www.cote-cote.com/en/blog/iso-2768-vl-general-tolerancehttps://www.cote-cote.com/en/blog/iso-2768-vl-general-toleranceHow to apply the ISO 2768-vL general tolerance to very coarse parts, with the class L geometric tolerances and an example.Fri, 19 Jun 2026 00:00:00 GMTISO 2768ISO 2768-vLgeneral tolerancesThe CoteCote teamhttps://www.cote-cote.com/en/blog/m6-fundamental-deviation-and-limitshttps://www.cote-cote.com/en/blog/m6-fundamental-deviation-and-limitsA complete method for calculating the m6 fundamental deviation to ISO 286: deviation table, limits in mm and a dimensional inspection example.Mon, 15 Jun 2026 00:00:00 GMTISO 286m6fitmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/k6-fundamental-deviation-and-limitshttps://www.cote-cote.com/en/blog/k6-fundamental-deviation-and-limitsHow to find the k6 fundamental deviation to ISO 286: calculating the limits of a transition fit, with a worked example.Wed, 10 Jun 2026 00:00:00 GMTISO 286k6fitmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/profile-of-a-surface-tolerance-iso-1101https://www.cote-cote.com/en/blog/profile-of-a-surface-tolerance-iso-1101A complete method for inspecting an ISO 1101 profile of a surface tolerance on a CMM by comparison with the CAD model, with a worked example.Fri, 05 Jun 2026 00:00:00 GMTISO 1101profile of a surfaceGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/profile-of-a-line-tolerance-iso-1101https://www.cote-cote.com/en/blog/profile-of-a-line-tolerance-iso-1101How to inspect an ISO 1101 profile of a line tolerance by CMM probing or on a profile projector, with a worked example.Mon, 01 Jun 2026 00:00:00 GMTISO 1101profile of a lineGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/trapezoidal-thread-tr-inspectionhttps://www.cote-cote.com/en/blog/trapezoidal-thread-tr-inspectionA practical method for inspecting a Tr trapezoidal thread to ISO 2903: calculating the pitch diameter with gauge wires and thread gauges.Wed, 27 May 2026 00:00:00 GMTTr threadISO 2903gauge wiresmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/micrometer-calibration-iso-3611https://www.cote-cote.com/en/blog/micrometer-calibration-iso-3611A complete method for calibrating an outside micrometer to ISO 3611: gauge blocks, anvil parallelism and error calculation.Fri, 22 May 2026 00:00:00 GMTISO 3611micrometercalibrationmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/vernier-caliper-calibration-iso-13385https://www.cote-cote.com/en/blog/vernier-caliper-calibration-iso-13385The calibration procedure for a caliper to ISO 13385-1: inspection points, gauge blocks, MPE tolerances and the calibration record.Mon, 18 May 2026 00:00:00 GMTISO 13385calipercalibrationmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/measurement-uncertainty-5m-methodhttps://www.cote-cote.com/en/blog/measurement-uncertainty-5m-methodHow to calculate measurement uncertainty with the 5M diagram (Material, Milieu, Means, Method, Manpower), with a worked application.Wed, 13 May 2026 00:00:00 GMT5MuncertaintymetrologyISO 14253The CoteCote teamhttps://www.cote-cote.com/en/blog/angularity-tolerance-iso-1101-sine-barhttps://www.cote-cote.com/en/blog/angularity-tolerance-iso-1101-sine-barHow to calculate and inspect an ISO 1101 angularity tolerance on a sine bar and a CMM, with a worked example.Fri, 08 May 2026 00:00:00 GMTISO 1101angularitysine barGD&TThe CoteCote teamhttps://www.cote-cote.com/en/blog/chamfer-inspection-method-and-limitshttps://www.cote-cote.com/en/blog/chamfer-inspection-method-and-limitsA rigorous method for inspecting a 45° or 30° chamfer with a chamfer gauge and a dial indicator, with a worked example.Mon, 04 May 2026 00:00:00 GMTchamfermetrologyinspectionmachiningThe CoteCote teamhttps://www.cote-cote.com/en/blog/symmetry-tolerance-iso-1101https://www.cote-cote.com/en/blog/symmetry-tolerance-iso-1101How to calculate and inspect an ISO 1101 symmetry tolerance relative to a median datum plane, with a worked example.Wed, 29 Apr 2026 00:00:00 GMTISO 1101symmetryGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/how-to-balloon-a-drawing-as9102https://www.cote-cote.com/en/blog/how-to-balloon-a-drawing-as9102A practical guide: how to balloon a mechanical drawing without missing anything, balloon numbering rules and preparing the FAI package.Fri, 24 Apr 2026 00:00:00 GMTAS9102ballooningmechanical drawingFAIThe CoteCote teamhttps://www.cote-cote.com/en/blog/cylindricity-tolerance-iso-1101https://www.cote-cote.com/en/blog/cylindricity-tolerance-iso-1101How to inspect an ISO 1101 cylindricity tolerance by CMM scanning, with a worked example and an analysis of the deviations.Mon, 20 Apr 2026 00:00:00 GMTISO 1101cylindricityGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/roundness-tolerance-iso-1101-dial-gaugehttps://www.cote-cote.com/en/blog/roundness-tolerance-iso-1101-dial-gaugeA practical guide to measuring an ISO 1101 roundness tolerance with a dial indicator on a V-block or a roundness tester, with a worked example.Wed, 15 Apr 2026 00:00:00 GMTISO 1101roundnessGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/h7-f7-fit-maximum-minimum-clearancehttps://www.cote-cote.com/en/blog/h7-f7-fit-maximum-minimum-clearanceA complete method to work out the maximum and minimum clearance of an ISO H7/f7 running fit, with a table and a worked example.Fri, 10 Apr 2026 00:00:00 GMTISO 286H7 f7clearancefitThe CoteCote teamhttps://www.cote-cote.com/en/blog/h7-p6-fit-interference-calculationhttps://www.cote-cote.com/en/blog/h7-p6-fit-interference-calculationHow to calculate the maximum and minimum interference of an H7/p6 press fit to ISO 286, with an assembly example.Mon, 06 Apr 2026 00:00:00 GMTISO 286H7 p6interferencefitThe CoteCote teamhttps://www.cote-cote.com/en/blog/hole-centre-distance-without-cmmhttps://www.cote-cote.com/en/blog/hole-centre-distance-without-cmmA step-by-step method for checking the centre distance of two holes with gauge pins and a caliper or an outside micrometer.Wed, 01 Apr 2026 00:00:00 GMTcentre distancegauge pinsmetrologyinspectionThe CoteCote teamhttps://www.cote-cote.com/en/blog/straightness-tolerance-iso-1101https://www.cote-cote.com/en/blog/straightness-tolerance-iso-1101How to check an ISO 1101 straightness tolerance on an axis or a cylinder generating line, with a worked inspection example.Fri, 27 Mar 2026 00:00:00 GMTISO 1101straightnessGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/flatness-tolerance-iso-1101-surface-platehttps://www.cote-cote.com/en/blog/flatness-tolerance-iso-1101-surface-plateA practical method for inspecting an ISO 1101 flatness tolerance on a granite surface plate and a CMM, with a worked example.Wed, 18 Mar 2026 00:00:00 GMTISO 1101flatnessGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/g6-fundamental-deviation-and-limitshttps://www.cote-cote.com/en/blog/g6-fundamental-deviation-and-limitsHow to calculate the g6 fundamental deviation to ISO 286, with the table of IT6 values, es/ei deviations and a machining example.Fri, 13 Mar 2026 00:00:00 GMTISO 286g6fitmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/iso-2768-fh-general-tolerancehttps://www.cote-cote.com/en/blog/iso-2768-fh-general-toleranceA full explanation of the ISO 2768-fH general tolerance: tables of fine deviations and geometric class H, with an applied example.Mon, 09 Mar 2026 00:00:00 GMTISO 2768ISO 2768-fHtolerancesmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/iso-taper-inspection-with-gauge-pinshttps://www.cote-cote.com/en/blog/iso-taper-inspection-with-gauge-pinsFormulas and method for inspecting an ISO taper with calibrated gauge pins and a micrometer, with a worked acceptance example.Wed, 04 Mar 2026 00:00:00 GMTISO tapergauge pinsmetrologyinspectionThe CoteCote teamhttps://www.cote-cote.com/en/blog/parallelism-tolerance-iso-1101https://www.cote-cote.com/en/blog/parallelism-tolerance-iso-1101A rigorous method for inspecting an ISO 1101 parallelism tolerance on a surface plate and a CMM, with a full worked example.Fri, 27 Feb 2026 00:00:00 GMTISO 1101parallelismGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-2https://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-2A practical guide to filling in AS9102 Form 2: raw material traceability, special processes and certificates of conformance.Tue, 24 Feb 2026 00:00:00 GMTAS9102FAIForm 2special processesThe CoteCote teamhttps://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-1https://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-1A complete method for filling in AS9102 Form 1 of the first article inspection, with the list of fields and an example.Wed, 18 Feb 2026 00:00:00 GMTAS9102FAIForm 1qualityThe CoteCote teamhttps://www.cote-cote.com/en/blog/perpendicularity-tolerance-iso-1101https://www.cote-cote.com/en/blog/perpendicularity-tolerance-iso-1101A practical guide to measuring an ISO 1101 perpendicularity tolerance on a surface plate with a precision square, a dial indicator and a worked example.Fri, 13 Feb 2026 00:00:00 GMTISO 1101perpendicularityGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/h7-fundamental-deviation-hole-and-shafthttps://www.cote-cote.com/en/blog/h7-fundamental-deviation-hole-and-shaftA step-by-step method for finding the H7 and h7 fundamental deviations to ISO 286, with the table of IT7 intervals and an inspection example.Mon, 09 Feb 2026 00:00:00 GMTISO 286H7h7tolerancesThe CoteCote teamhttps://www.cote-cote.com/en/blog/iso-metric-thread-inspection-wires-gaugeshttps://www.cote-cote.com/en/blog/iso-metric-thread-inspection-wires-gaugesA practical method for inspecting an ISO metric thread with thread ring gauges and the three-wire method, with calculations and an example.Mon, 02 Feb 2026 00:00:00 GMTISO 965threadgauge wiresmetrologyinspectionThe CoteCote teamhttps://www.cote-cote.com/en/blog/coaxiality-tolerance-iso-1101https://www.cote-cote.com/en/blog/coaxiality-tolerance-iso-1101How to calculate and inspect an ISO 1101 coaxiality tolerance, with the surface plate measuring method and a worked example.Fri, 16 Jan 2026 00:00:00 GMTISO 1101coaxialityGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/ra-rz-roughness-iso-21920-measurementhttps://www.cote-cote.com/en/blog/ra-rz-roughness-iso-21920-measurementThe difference between Ra and Rz, choosing the λc cut-off, evaluation length and the 16% rule under ISO 21920, with an inspection example taken to a verdict.Wed, 07 Jan 2026 00:00:00 GMTISO 21920roughnessRaRzmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/worst-case-tolerance-stack-uphttps://www.cote-cote.com/en/blog/worst-case-tolerance-stack-upA detailed method for a worst-case tolerance stack-up: closing equation, limits and a full worked example.Mon, 22 Dec 2025 00:00:00 GMTtolerance stack-upworst casetolerancingdesign officeThe CoteCote teamhttps://www.cote-cote.com/en/blog/position-tolerance-iso-1101-mmchttps://www.cote-cote.com/en/blog/position-tolerance-iso-1101-mmcHow to calculate an ISO 1101 position tolerance at maximum material condition (MMC), with bonus tolerance and a worked example.Tue, 09 Dec 2025 00:00:00 GMTISO 1101ISO 2692MMCpositionGD&TThe CoteCote teamhttps://www.cote-cote.com/en/blog/why-scanned-drawings-read-badlyhttps://www.cote-cote.com/en/blog/why-scanned-drawings-read-badlyWhy a scanned drawing reads badly with OCR, and practical ways to improve the scanning and recognition of your drawings.Tue, 25 Nov 2025 00:00:00 GMTscanOCRdigitisationCADmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/iso-2768-mk-general-tolerance-250-mmhttps://www.cote-cote.com/en/blog/iso-2768-mk-general-tolerance-250-mmWorking out the ISO 2768-mK general tolerance on a 250 mm dimension: dimensional limits, geometric tolerance and an inspection example.Fri, 14 Nov 2025 00:00:00 GMTISO 2768ISO 2768-mKgeneral tolerancesmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-3https://www.cote-cote.com/en/blog/how-to-fill-in-as9102-form-3A step-by-step guide to filling in AS9102 Form 3 of the FAI package, with the recording method and a concrete example.Thu, 30 Oct 2025 00:00:00 GMTAS9102FAIaerospacequalityThe CoteCote teamhttps://www.cote-cote.com/en/blog/circular-runout-vs-total-runouthttps://www.cote-cote.com/en/blog/circular-runout-vs-total-runoutThe difference between circular runout and total runout under ISO 1101, how each is measured, and a worked example.Mon, 20 Oct 2025 00:00:00 GMTISO 1101runoutGD&TmetrologyThe CoteCote teamhttps://www.cote-cote.com/en/blog/js9-deviation-and-limitshttps://www.cote-cote.com/en/blog/js9-deviation-and-limitsA complete method for calculating the js9 deviation on a mechanical drawing, with the table of IT9 values, limits in millimetres and an example.Mon, 06 Oct 2025 00:00:00 GMTISO 286js9tolerancesmetrologyThe CoteCote team