sent to Sandvik and ISCAR for optimization, producing a STEP-NC description containing all three process options. All machining was done in titanium and a range of CAM software was used, with all results captured as STEP-NC. At IMTS 2018, a team consisting of Airbus, Boeing, DMG MORI, Hyundai WIA, Renishaw, and Mitutoyo demonstrated Digital Twin manufacturing by combining STEP-NC model and process data with MTConnect machine tool status and Quality Information Format (QIF) metrology results. A second edition of AP238 was published in 2020, followed by a third edition in 2022 for model-based integrated manufacturing, with geometry, tolerance, and kinematics improvements first introduced by AP242. Future work Work continues within the ISO standard committees to extend STEP-NC to new technologies and to incorporate refinements discovered during use. Process models for new technologies are usually produced by the ISO TC184/SC1/WG7 committee. Models for Wire & Sink EDM and contour cutting of wood or stone are under investigation. Work on extending and integrating STEP-NC with the manufacturing enterprise takes place in the ISO TC184/SC4/WG3/T24 STEP Manufacturing Team. This group also works on extensions and refinements discovered during testing. A series of traceability extensions have been proposed for linking STEP-NC machining programs with sensor feedback and machine state information during execution. The National Shipbuilding Research Program (NSRP) has also hosted work to implement a prototype that connects a shipyard design system to a plate cutting using STEP-NC. This work involved extending STEP-NC to steel plate cutting and marking using lasers and plasma torches. References External links Video: STEP-NC impeller machining demo (2008-10-01) Video: STEP-NC tolerance-driven tool compensation demo (2008-03-12) What is STEP-NC? A toolkit for ISO 14649 Parts 10, 11, and 111 Industrial automation Computer-aided engineering Machine tools ISO 10303