In Windows software, defaults can be the program that opens an image file or the fonts that are automatically used when you open your word processor. This article highlights ten of the common defaults from the Y14.5 standard.Ī "default" is something that applies automatically. If you are not aware of or cannot interpret the defaults, you are missing critical information about the requirements of the drawing. The Y14.5 defaults are described in the standard.
Recognizing defaults is a bit tricky because they do not appear on a drawing. A list of revisions follows: ASME Y14.5-2018, "Dimensioning and Tolerancing" Current Standard Preceded by ASME Y14.5-2009 ASME Y14.5-2-2017, "Certification of Geometric Dimensioning and Tolerancing Professionals" Current Standard Preceded by ASME Y14.5-2-2000 ASME Y14.5-2009 Succeeded by ASME Y14.5-2018 Preceded by ASME Y14.5M-1994 ASME Y14.5M-1994 Succeeded by ASME Y14.5-2009 Reaffirmed in 2004 Preceded by ANSI Y14.5M-1982 ANSI Y14.5M-1982 Preceded by ANSI Y14.5-1973 Reaffirmed in 1988 ANSI Y14.5-1973 Succeeded by ASME Y14.5M-1982 Preceded by USASI Y14.5-1966 USASI Y14.5-1966 Succeeded by ANSI Y14.5-1973 Preceded by ASA Y14.5-1957 ASA Y14.5-1957 Succeeded by USASI Y14.5-1966 Preceded by ASA Z14.Do you know which defaults from the ASME Y14.5 standard apply to your drawings? To correctly read a drawing, you must be able to recognize the defaults from Y14.5 and understand where they apply. Further revisions have continued to add new concepts and address new technology like Computer Aided Design and Model-based definition. It was revised by MIL-STD-8A in 1953 which introduced the concept of modern GD&T "Rule 1". The modern standard can trace its roots to the military standard MIL-STD-8 published in 1949. Effective application of GD&T allows for parts to be verified by dimensional measurements, gauging, or by CMM.
Together these standards allow for clear and concise detailing of dimensional requirements on a product drawing or electronic drawing package as well as the verification of the requirements on manufactured parts. It is complemented by ASME Y14.5.1 - Mathematical Definition of Dimensioning and Tolerancing Principles. It contains 12 sections which cover symbols and datums as well as tolerances of form, orientation, position, profile and runout.
ASME Y14.5 is a complete definition of Geometric Dimensioning and Tolerancing.