Ordinate dimensions correspond to X-Datum or Y-Datum point coordinates. This type of dimensioning is useful, not only for elevations, but also for perforated plates or other areas with a reference point. Before applying ordinate dimensions, it is often necessary to specify a new coordinate system just for indicating a new origin.
The CCS
command (also UCS
, on the CCS toolbar, or Tools | New CCS main menu) creates custom coordinate systems. By default, the command prompts for the new origin, a second point that indicates X direction and a third point that indicates the positive XY plane. If Enter is pressed when prompted for the second point, a new custom coordinate system is created just by moving origin:
: CCS Default: World Options: align to Entity, NAmed, Previous, View, World, X, Y, Z, ZAxis or Specify origin» P1 Options: Enter to accept or Specify X-axis through point» Enter
The World option allows the user to return to the world coordinate system (WCS...