For any machine part that rotates during the simulation, a center of rotation, its local coordinate system must be specified using the Local Coordinate System dialog:
To open this dialog, select Machine Design tab > Motion panel > Local Coordinate System.
Rotating parts include turrets and rotating tables. Parts that rotate about the A axis rotate about its local X axis. B-axis rotations are performed about the local Y axis and C-axis rotations rotate around the local Z axis.
To use this dialog: