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What is GD&T and why is it important?

What is GD&T and why is it important?

“Geometrical Product Specifications” (GPS) refers to the specifications and verification of allowable geometric variations in a product. “Geometrical Dimensioning and Tolerancing” (GD&T) is a language that allows specifying allowable geometric variations in a manufactured product. The need comes from the fact that designers create perfect geometries using CAD systems that cannot include any variation from the nominal values.

Defining a good GPS tolerancing starts with the identification of the datums. The datums are usually the surfaces that will be in contact with other components and that define the position of the part. The shaft shows in the following figure is mounted on two bearings on the cylindrical surfaces having diameters of 17 and 20 mm. Those surfaces consequently control the orientation of the shaft and are defined as datum A1 and A2 in Enventive. A construction line common to A1 and A2 is finally defined as first datum A.

A systematic GPS tolerancing based on the way the shaft is physically positioned prevent off-set and misalignment problem that a simple dimensioning tolerance would overlook. Enventive allows you to define ISO-GPS as well as ASME Y14.5M standards. This page [reference to the page showing Equivalent GT&D symbols] describes how Enventive mathematically interprets some GT&D definitions.

IMPORTANT: speak about geometric product specification (GPS) in this page

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