ABSTRACT
Plus/minus location tolerancing can be easily converted into positional tolerancing. The whole concept of positional tolerancing is based on the idea that a cylindrical feature of size, such as a hole, should be allowed to vary in location the same amount in any direction. This is true for most applications. If a cylindrical hole can be 1.4 mm diagonally from its nominal location and still function, then it should function when the hole is 1.4 mm from its nominal location in any direction. Hence, a cylindrical tolerance zone allows a feature to vary equally in any direction from its nominal or basic location.
