Mechanical Writings

Geometric tolerances Geometric dimensioning and tolerancing (GD

Tolerance is the so-called mechanical drawing geometric shapes mentioned tolerance and position tolerance, the general requirements of the drawings are not very strict if the words do not need to mark the geometric tolerances, but when you need to mark, for example, asking the two planes must be parallel, then tolerance to scale parallelism, then we should set the benchmark to which a flat surface, you need to set up better in three dimensions, and then found in a drawing to set the benchmark three-dimensional plane, using the display tool to display and then use of geometric tolerances tool reference plane chosen to determine the tolerance, then select another plane flatness tolerancing do, you can, and should be the size of the flat line mark. In addition to the concept of tolerance explained as follows: Tolerance points dimensional tolerance and geometric tolerance, dimensional tolerance refers to the size of a workpiece to a size you think that the scope of qualified, while the geometric tolerance is, as mentioned above, into the shape and position tolerance tolerance tolerance is like a round shape is not round, flat uneven, not straight straight some measure of value, and position refers to as the vertical tolerance is not perpendicular to ah, ah not parallel flat, round, then to some of the same measure with different values of heart. Refer to the relevant state specific geometric tolerance standards.
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