One common area of confusion within GDT is between parallelism and flatness. With, parallelism, a reference is made to a datum plane, while flatness is independent of a datum. Figure PF1.1 shows a block on a surface plate whose three points of contact define the -A- datum plane.
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What follows is a short summary of feature control symbols used in GDT. As was mentioned in the introduction, this is not intended to be an exhaustive presentation of GDT, but rather a concise, clear explanation of GDT's most important ... Symbol Glossary; Directory | Career | News | Standards | Industrial | SpecSearch®...
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3.3 ORIENTATION - Orientation tolerance symbols include parallelism, perpendicularity, and angularity. 3.2.2 Flatness - The flatness symbol appears as an oblique view of a square surface. See Figure 20. This symbol is used in feature control frames and is only used to control the form variations on flat features.
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Figure 1a demonstrates how the flatness symbol is applied, and interpreted. ... For flatness specifications, refer to Coordinate Dimensioning Tolerances in ...
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Effective Training Inc - GD&T Glossary ... Flatness - The condition of a surface having all of its elements in one plane. ... Datum Target - A symbol that describes the shape, size, and location of gage elements that are used to establish datum planes or axes.
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When the straightness symbol is attached to an otherwise flat surface, ... 2. Flatness may be applied to any flat surface in addition to customary size controls whenever the acceptable limits of variation prescribed (e.g., flatness) need to be held tighter than the size limits alone. Like straightness, flatness is referenced...
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Flatness — All the points on a surface are in one plane, the tolerance specified by a zone formed by two parallel planes. ... When it is applied to surfaces constructed at right angles to a datum axis, it controls cumulative variations of perpendicularity and flatness.
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