![]() ![]() “F” stands for “free state,” and means to apply the tolerance under a free state. For parts that deform beyond size tolerance or geometric tolerance in a free state, you will write after the geometric tolerance in the feature control frame to indicate that the part is a non-rigid target. Generally, geometric tolerance applies to rigid parts. The unequally disposed symbol is used to apply unilateral or unequal tolerance zones to a profile of a part. ![]() You will also need to indicate that the part is non-rigid and the conditions under which the geometric tolerance under free state is ensured (such as direction of gravity). The Unequally Disposed Profile Tolerance Symbol is only ever seen when used in conjunction with the Geometric Dimensioning and Tolerancing symbols for profile of a surface and profile of a line. Form Tolerance - A form tolerance states how far an actual surface is. Parts like those made of rubber or resin, where deformation beyond what is specified in the drawing is presumed to occur due to a release of internal stress generated during the manufacturing process, are called non-rigid parts.įor non-rigid parts, you will indicate the geometric tolerance in a free state (a state where only the force of gravity is applied). Flatness - Flatness is the condition of a surface having all elements in one plane.
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