形位公差英文翻譯

Geometric Dimensioning and Tolerancing (GD&T) is a system used in engineering to communicate design requirements for manufactured parts. One of the key components of GD&T is positional tolerancing, which specifies the allowable deviation of a feature from its desired location.

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Positional tolerancing is achieved through the use of a geometric tolerance called 'Position,' which combines both a linear tolerance and an angular tolerance. This tolerance is used to control the location, orientation, and alignment of features on a part.

One important aspect of positional tolerancing is the concept of 'datum features.' These are reference features on a part that are used to establish a coordinate system for all other features on the part. The position of each feature is then measured relative to these datum features, allowing for a consistent and reliable method of measuring and inspecting parts.

Another important aspect of positional tolerancing is the use of 'form controls,' which specify the allowable deviation of the shape of a feature from its ideal form. This includes controls for straightness, flatness, roundness, cylindricity, and profile.

Overall, the use of positional tolerancing and GD&T is critical for ensuring that manufactured parts meet the design requirements and function correctly in their intended applications. By communicating design requirements clearly and accurately, GD&T helps to minimize errors, reduce waste, and improve the quality of the final product.