This section explains what I call the "size envelope default." This default is from paragraph 2.7. How many Y14.5 default conditions can you find on the bracket drawing? A default condition may have methods to override it listed in the standard or the methods to override a default may be open to the user to specify. Therefore, I consider Rule#1 a default condition. There are several ways to override Rule #1.
Rule #1 is a requirement that applies automatically to feature of size dimensions. One common example of a default condition from Y14.5 is Rule #1 (perfect form at MMC from paragraph 2.7). These various methods used make some of the defaults in the standard difficult to recognize. In Y14.5 there are also some defaults that apply to a drawing when a specification is shown on the drawing that could be interpreted multiple ways, but one way applies automatically. Sometimes defaults are explained using other words or terms. A default condition is often indicated in the Y14.5 standard by using the words "Unless Otherwise Specified." (followed by or preceded by a description of the default.) However, in the Y14.5 standard, default conditions are not always stated using those words. Default conditions that impact the interpretation of a specification on a drawing.Default conditions that are described in the standard and automatically apply on a drawing.There are two types of default conditions in Y14.5: Default conditions can be overridden by specifying a different requirement, rule, specification, or method on the drawing. I will start by defining the term "default condition" based on my interpretation of the standard and the way I use them in this article.Ī default condition is a requirement, rule, specification, or method that has options allowed and one of the options automatically applies to a drawing. In the Y14.5 standard, there is not a definition for defaults.
What is a default condition in the ASME Y14.5-2009 Standard? One nice thing about defaults is that you can change them.
#ASME Y14.5 1994 VS 2009 STANDARD COMPARISON CHART WINDOWS#
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. 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.
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