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GD&T reduces ambiguities so inspection results are consistently within or out of tolerance.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"What is a location tolerance in GD&T?",{"text":67,"@type":63},"A location tolerance specifies how features are located relative to datums. 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Datum Plane   5-5  \n4.3 Datum Plane Vs. Datum Axis   5-5  \n4.4 Datum Target Sizes & Locations   5-6  \n5 Feature Control Frame   5-6  \n6 Rule \\#1 – Taylor Principle (Envelope Principle)  5-7  \n7 GD&T Symbols/Meanings   5-8  \n8 Material Conditions   5-8  \n8.1 Maximum Material Condition (MMC)   5-8  \n8.2 Least Material Condition (LMC)   5-9  \n8.3 Regardless of Feature Size (RFS)   5-10  \n9 Location Tolerances   5-11  \n9.1 Position Tolerance   5-11  \n9.2 Concentricity & Symmetry Tolerances   5-13  \n10 Profile Tolerance   5-14  \n11 Run Out Tolerances   5-18  \n12 Orientation Tolerances   5-19  \n13 Form Tolerances   5-21  \n13.1 Straightness   5-21  \n13.2 Flatness   5-23  \n13.3 Circulatity (Roundness)   5-23  \n13.4 Cylindricity   5-23  \n14 Conversion Charts   5-29  \n14.1 Conversion of Position (Cylindrical) Tolerance Zones 5-29  \nto/from Coordinate Tolerance Zones  \n14.2 Conversion of Position Tolerance Zone 5-32  \nto/from Coordinate Tolerance Zone  \n14.3 Conversion of Coordinate Measurements to 5-33  \nPosition Location Measurements  \n\n|  |\n| --- |\n|  |\n\n5  \n5  \nNADCA Product Specification Standards for Die Castings / 2015 5-1  \nEngineering & Design: Geometric Dimensioning  \nFrequently Asked Questions (FAQ)  \n1) Is Geometric Dimensioning used on just Die Castings and why should it be used? See page 5-2-Why should GD&T be used?  \n2) What is a Location Tolerance?  \nSee page 5-11, Location Tolerances  \n3) How do I convert a linear tolerance to true position?  \nSee pages 5-32 through 5-34, Conversion of Position.  \n4) Is a list of GD&T symbols availible?  \nSee page 5-8, GD&T Symbols and Meanings.  \n5) When can I use Profile of a surface instead of flatness?  \nSee page 5-14, Profile Tolerances.  \n1 Introduction  \nThe concept of Geometric Dimensioning and Tolerancing (GD&T) was introduced by Stanley Parker from Scotland in the late 1930’s. However, it was not used to any degree until World War II (WWII) because until then the vast majority of products were made in-house. The designer could discuss with the manufacturing personnel (die designer, foundry foreman, machinist, and inspectors) what features were to be contacted to establish the so called “centerlines” that were used on the drawing to locate features such as holes and keyways. Also when two (2) or more features were shown coaxial or symmetrical around these “centerlines”, the questions that needed to be answered by the designer was,“how concentric or symmetrical do these features have to be to each other”?. During WW II companies had to “farm out” parts because of the quantities/schedules. This meant the new manufacturer had to interpret the drawing hence the “centerlines” were often established by contacting features that were not functional or important and features produced from these incorrect “centerlines” were not at the location required. The parts did not assemble and/or did not function properly and had to be fixed or scrapped. GD&T was the solution to this major problem. GD&T provides a designer the tools to have clear, concise, and consistent instructions as to what is required. It eliminates ambiguities so that everyone involved with the part will not have to interpret the dimensioning.  \n2 What is GD&T?  \nIt is compilation of symbols and rules that efficiently describe and control dimensioning & tolerancing for all drawings (castings, machined components,etc.) . It is documented in ASMEY14.5M which has the symbols, rules, and simple examples. Also ASME Y14.8 has guidance for casting and forging drawings.  \n3 Why should GD&T be used?  \na. It is a simple and efficient method for describing the tolera","cbCaiv6Q2QSXPUdD","https://ap.wps.com/l/cbCaiv6Q2QSXPUdD","pdf",7370028,34,"English","# Frequently Asked Questions\n## Introduction\n## What is GD&T?\n## Why Should GD&T be Used?\n## Datum Reference Frame\n## Feature Control Frame\n## Rule #1 – Taylor Principle (Envelope Principle)\n## GD&T Symbols/Meanings\n## Material Conditions\n## Location Tolerances\n## Profile Tolerance\n## Run Out Tolerances\n## Orientation Tolerances\n## Form Tolerances\n## Conversion Charts","[{\"question\":\"Is geometric dimensioning used only for die castings, and why should it be used?\",\"answer\":\"It is used to efficiently describe and control dimensioning and tolerancing across drawings, including die castings and machined components. GD\\u0026T reduces ambiguities so inspection results are consistently within or out of tolerance.\"},{\"question\":\"What is a location tolerance in GD\\u0026T?\",\"answer\":\"A location tolerance specifies how features are located relative to datums. The section also illustrates location tolerance through position tolerance discussions and related inspection outcomes.\"},{\"question\":\"How can a linear tolerance be converted to true position?\",\"answer\":\"Use the conversion guidance provided in the Conversion Charts, including conversions of position tolerance zones to/from coordinate tolerance zones and translating coordinate measurements into position location measurements.\"}]","Engineering & Design: Geometric Dimensioning - Section 05 - Frequently Asked Questions | PDF",1792825022,86]