The Parallel Cuts option creates a toolpath pattern with parallel slices. The orientation of the slices is defined by two angles: X-Y (which rotates the slices around the Z axis) and Z. Imagine slicing an apple: You can slice it with a knife parallel from top to bottom or from left side to right side. The pictures in the dialog symbolize how to set the desired cutting direction using the angles.

Station: CAM-Surfaces-ParallelCuts.