Alibre Design

Chapter 5 - 3D Sketching5.1.2 Current Coordinate SystemIn the 3D sketching environment, all position-related data is entered with respect to theCurrent Coordinate System (CCS). The CCS is depicted graphically by a 3D coordinatesystem in the work area. This graphical coordinate system is called the CCS indicator.Upon entering 3D sketch mode, the CCS is automatically created using the active plane,which becomes the XY-Plane of the CCS. The direction of the axes is determinedautomatically by the system.‣ To Define A New 3D Coordinate System:The CCS can be changed using the Define 3D-Coordinate System command.1. Select the Define Coordinate System tool from the Sketching toolbar; orfrom the 3D Sketch menu, select Define Coordinate System. The DefineCoordinate System dialog box appears.2. Enter the following information:3. Plane: Required - Enter the desired reference plane, planar face, or 2D sketch tobe used as the plane. Checking Reverse will toggle which Z-axis direction ispositive.4. X-Vector: Optional - Enter the reference axis, linear edge, 2D sketch line, or 3Dsketch line to be used for the X-Vector. Checking Reverse will toggle which X-axis direction is positive.5. Origin: Optional - Enter a reference point, vertex, 2D node, or 3D node to be usedas the origin. If Project is checked, the point is projected to the plane to becomethe origin; otherwise the plane is moved to intersect the point that becomes theorigin.6. Click OK to apply the changes.122