Editing Engineering drawing (section)

==Standardization and disambiguation==

Engineering drawings specify the requirements of a component or assembly which can be complicated. Standards provide rules for their specification and interpretation. Standardization also aids [[internationalization]], because people from different countries who speak different languages can read the same engineering drawing, and interpret it the same way.

One major set of engineering drawing standards is [[American Society of Mechanical Engineers|ASME]] Y14.5 and Y14.5M (most recently revised in 2018). These apply widely in the United States, although [https://www.iso.org/obp/ui/#iso:std:iso:8015:ed-2:v1:en ISO 8015 (Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules)] is now also important. In 2018, [[American Society of Mechanical Engineers|ASME]] AED-1 was created to develop advanced practices unique to aerospace and other industries and supplement to Y14.5 Standards.

In 2011, a new revision of [https://www.iso.org/obp/ui/#iso:std:iso:8015:ed-2:v1:en ISO 8015 (Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules)] was published containing the Invocation Principle. This states that, "Once a portion of the ISO geometric product specification (GPS) system is invoked in a mechanical engineering product documentation, the entire ISO GPS system is invoked." It also goes on to state that marking a drawing "Tolerancing ISO 8015" is optional. The implication of this is that any drawing using ISO symbols can only be interpreted to ISO GPS rules. The only way not to invoke the ISO GPS system is to invoke a national or other standard. Britain, [[BS 8888]] (Technical Product Specification) has undergone important updates in the 2010s.