DimXpert Datum You can use the DimXpert Datum tool to define datum features. To access this tool: Click Datum (MBD Dimension toolbar) or Tools > MBD Dimension > Datum. The tool supports these feature types: Boss Cylinder Notch Plane Simple Hole Slot Width Most DimXpert Datum Feature PropertyManager options are the same as the non-DimXpert Datum Feature PropertyManager. Differences are noted below. Label Settings When applying or editing a datum, enter a datum Label and assign a leader type. Specify the starting label under Tools > Options > Document Properties > Drafting Standard > Annotations > Datums. When entering datum labels, the inputs are checked for syntax per the active drawing standard. For example: Entering a numeric generates a warning message for all standards. Entering an I, O, or Q generates a warning message when in ANSI. Entering AA generates a warning message when in ISO. Leader Surface Attaches the datum triangle to a feature's surface. Directed Leader Attaches the datum triangle to a directed leader. Dimension Attaches the datum triangle to a dimension or a feature control frame. Gtol Attaches the datum triangle to a feature control frame. Datum Examples by Feature Boss Cylinder Notch Plane Simple Hole Slot Width