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The modern standard can trace its roots to the military standard MIL-STD-8 published in 1949. [4] It was revised by MIL-STD-8A in 1953, which introduced the concept of modern GD&T "Rule 1". [ 5 ] [ 6 ] Further revisions have continued to add new concepts and address new technology like Computer Aided Design and Model-based definition .
Proper application of GD&T will ensure that the part defined on the drawing has the desired form, fit (within limits) and function with the largest possible tolerances. GD&T can add quality and reduce cost at the same time through producibility. According to ASME Y14.5, the fundamental rules of GD&T are as follows, [2]: 7–8
ASME Y14.41 is a standard published by American Society of Mechanical Engineers (ASME) which establishes requirements and reference documents applicable to the preparation and revision of digital product definition data (also known as model-based definition), which pertains to CAD software and those who use CAD software to create the product definition within the 3D model.
Geometrical Product Specification and Verification (GPS&V) [1] is a set of ISO standards developed by ISO Technical Committee 213. [2] The aim of those standards is to develop a common language to specify macro geometry (size, form, orientation, location) and micro-geometry (surface texture) of products or parts of products so that the language can be used consistently worldwide.
It had an accompanying standard, ANSI/ASME Y14.1M, that defined metric drawing paper sizes based upon ISO 216 and ISO 5457. [2] ASME Y14.1 and ASME Y14.1M have now been revised and consolidated into one document, ASME Y14.1-2020, Drawing Sheet Size and Format , published on 18 December 2020.
A reference dimension is a dimension on an engineering drawing provided for information only. [1] Reference dimensions are provided for a variety of reasons and are often an accumulation of other dimensions that are defined elsewhere [2] (e.g. on the drawing or other related documentation).
National Pipe Taper Fuel (NPTF, also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3) is designed to provide a more leak-free seal without the use of PTFE tape (often referred to by the popular brand name "Teflon") or another sealant compound. NPTF threads have the same basic shape but with crest and root ...
Trapezoidal threads are defined as follows by ISO standards: Tr 60×9 where Tr designates a trapezoidal thread, 60 is the nominal diameter in millimeters, and 9 is the pitch in millimeters.