A Pitch Circle Dimension (PDIM) is another form of radial dimension. Refer to
Pitch Circle Dimensions for further information.
Radial Dimensions have a dimension centre, defined by the
DDNM (Design Data Name) attribute. This is an attribute of the RDIM itself, and is normally defined by the origin of the element dimensioned. (Refer to
Radial Dimensions for exceptions to this.) This could be (for example) the origin of a CYLI or of a (filleted) PAVE (Panel Vertex).
The other principal attribute of an RDIM is the dimension attribute key,
AKEY. This is a word attribute that stores the code of a dimensional attribute of the DESIGN element type that is to be dimensioned. The default value of AKEY is DIAM.