Parallel angle is available only in X and Y parallel roughing and sets what angle the roughing passes occur in reference to the X or Y axis. This value can be anywhere from -360 to 360 degrees. A positive value rotates counterclockwise from the Z axis, and a negative value rotates clockwise from the axis. Examples of using Parallel angle are:
Setting the angle to 90 on an X-parallel operation causes it to effectively become a Y-parallel operation.
Setting the angle to 180 will cause the toolpaths to cut from the opposite side of the part. For example, an X-parallel operation with the angle set to 0 will start at the minimum Y coordinate. With the angle set to 180, the toolapths will start at the maximum Y coordinate.