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KEYWORDS: data exchange, computerized numerical controler (CNC), machine tool, machining, milling, turning, additive manufacturing, GD&T, digital twin, STEP-NC.

This is the third edition of AP238. The document has been harmonized with AP242e3 through shared use of the ISO 10303 resource parts collectively published as SMRLv9.

The second edition of AP238 includes changes accumulated 2007-2020 from first edition deployment experience, as detailed in TC184/SC4/WG15N2. It was harmonized with AP242e2 through shared use of the ISO 10303 resource parts collectively published as SMRLv8. Application objects for GD&T, feature, management data, and machine kinematics are referenced in the SMRL rather than defined locally. Additive manufacturing process is supported based on machine actions defined by ISO 14649-17.

The new Annex K change log describes the changes in detail.