2/23/2024 0 Comments Symbol for flatness on a drawing![]() ![]() If the flatness tolerance had been 0.6, it would result in a condition where the overall size of the part may have exceeded its allowable size limits.īecause flatness refines a surface, it may be used in a tolerance stack. Note that the flatness tolerance must be less than the size tolerance associated with the surface. The boxed symbols can be read “this surface must lie between two parallel planes spaced 0.2 apart in all views.” The right figure shows a possible actual part condition. The left figure shows the drawing callout. When a datum target symbol is used on a drawing, it is often accompanied by the. ![]() Flatness tolerance applies in all drawing views, not just the view showing the tolerance callout.Īn example of flatness is shown below. Straightness tolerance specifies a tolerance zone within which the line. Flatness is usually used on a surface associated with a size dimension, acting as a refinement to the size requirement to ensure proper function of a part, or to promote even wear. Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. Angularity - is the condition of a surface, axis, or centerplane, which is at a specified angle from a datum plane or axis. Since flatness is applied to an individual surface, this tolerance does not need to be related to a datum. All Around Symbol - indicating that a tolerance applies to surfaces all around the part. In GD&T flatness tolerance defines a zone between two parallel planes within which a surface must lie. Many part designs contain surfaces that need to be uniform. ![]()
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