326 Geometric Dimensioning and Tolerancing Profile of a Sharp Corner When a profile tolerance is at a sharp corner, the tolerance zone extends to the intersection of the boundary lines. In these situations, a rounded corner can occur because the actual surface can be anywhere within the tolerance zone boundary. If this roundness must be controlled, then a maximum radius note shall be added to the drawing. The drawing in Example 9-11 has the note R0.2 MAX to indicate this. Unilateral or Unequally Disposed Profile of a Surface The profile of a surface can also be specified as a unilateral or unequally disposed tolerance using the same options available for the profile of a line previously described. The following options correlate with the drawing shown in Example 9-12. When a unilateral profile tolerance is required, the unequally disposed symbol is placed after the geometric tolerance in the feature control frame as shown in Example 9-12A. When the unilateral profile tolerance has material added to the feature or part, the profile tolerance value is repeated after the unequally disposed symbol. The feature control frame is connected to the edge view of the surface with a leader line. This is the preferred ASME Y14.5 use for this application. When the unilateral profile tolerance is total, and the tolerance has material removed from the feature or part, the profile tolerance value is placed before the unequally disposed symbol and a 0 is placed after the unequally disposed symbol to denote that the entire profile tolerance has less material removed from the feature or part. The feature control frame is connected to the edge view of the surface with a leader line as shown in Example 9-12B. This is the preferred ASME Y14.5 use for this application. When the profile tolerance is not equally split on each side of true profile, the total profile tolerance value is placed before the unequally disposed symbol in the feature control frame and the value of the tolerance that adds material to the feature or part is placed after the unequally disposed symbol. The feature control frame is connected to the edge view of the surface with a leader line as shown in Example 9-12C. This is the preferred ASME Y14.5 use for this application. An alternate method used when the profile tolerance is unequally disposed displays the total tolerance inside the feature control frame. Either the inside or outside of true profile is shown as a basic dimension. Example 9-12D shows the profile tolerance on the inside as a basic dimension of 0.1. The same result can be achieved by showing a basic dimension of 0.4 on the outside. One or the other must be dimensioned to show which way the tolerance applies and how much profile tolerance is allowed inside or outside. A dimension line with arrowheads is placed on each side of the phantom lines and connects the feature control frame with a leader. The basic dimension is required because the true profile is defined by basic dimensions and the tolerance zone must also be defined basic. The actual profile of the part must be between the basic zone created around the true profile.