ABSTRACT
The limits of size do not control the orientation or location relationship between individual features. Features shown perpendicular, coaxial or sym- metrical to each other must be further controlled with a tolerance to avoid an incomplete drawing requirement. In some angles, the perpendicularity must be controlled within a more uniform tolerance zone. These features can be geometrically toleranced with the use of a feature control frame that includes the perpendicularity symbol, a tolerance and a datum feature. General notes can also be used to create the boundary of perfect form and orientation at maximum material condition (MMC) between related features. A simple note such as "Perfect Orientation at MMC Required for Related Features" will create this boundary for any feature related on the drawing. Relating dimensions to a datum reference frame is a useful tool to orient a part for feature size verification.
