How does GD&T separate form, orientation, and location tolerances?

How does GD&T separate form, orientation, and location tolerances?

• A. Form tolerances control shape; orientation tolerances control angle/parallelism/perpendicularity; location tolerances control the position relative to datums.
• B. Form tolerances control color; orientation tolerances control mass; location tolerances control texture.
• C. Form tolerances control position; orientation tolerances control form; location tolerances control orientation.
• D. Form tolerances only control runout.

Answer: (A)

In GD&T, tolerances are organized by what aspect of a feature they affect: its shape, its tilt, or its position. Form tolerances govern the actual shape of the feature—things like straightness of a line, flatness of a surface, circularity of a hole, or cylindricity of a cylindrical surface. Orientation tolerances govern how a feature is tilted or angled relative to the datum system—think angularity, perpendicularity, and parallelism that describe the feature’s orientation. Location tolerances control where the feature sits in relation to the datums—most commonly the true position of the feature’s axis or center relative to the datum references. So the best description is that form controls shape, orientation controls angle/parallelism/perpendicularity, and location controls the position relative to datums. (Note: runout is a special case that blends form and orientation around a datum axis, not a blanket form control.)

In GD&T, tolerances are organized by what aspect of a feature they affect: its shape, its tilt, or its position. Form tolerances govern the actual shape of the feature—things like straightness of a line, flatness of a surface, circularity of a hole, or cylindricity of a cylindrical surface. Orientation tolerances govern how a feature is tilted or angled relative to the datum system—think angularity, perpendicularity, and parallelism that describe the feature’s orientation. Location tolerances control where the feature sits in relation to the datums—most commonly the true position of the feature’s axis or center relative to the datum references. So the best description is that form controls shape, orientation controls angle/parallelism/perpendicularity, and location controls the position relative to datums. (Note: runout is a special case that blends form and orientation around a datum axis, not a blanket form control.)