Purpose This specification provides a standard for the manufacture@ performance@ inspection@ and procurement of a series of numerically controlled@ horizontal and vertical spindle@ knee and bed type profilers. This standard lists minimum requirements and is not to limit design advances. Classification The machines shall be of the following types@ sizes@ and classes. Type I Knee Type ?C Vertical II Knee Type ?C Horizontal III Bed Type ?C Vertical IV Bed Type ?C Horizontal Size Small@ medium@ and large per Section 3.2. Class Numerically controlled@ three axes@ AIA Class IV Contouring and Profiling.