Event Circular Motion / ActionCircularMotion ================================================= It is the event that is activated by circular and helical motion lines usually expressed as “CIRCLE” (sometimes “ARC” etc.) in the APT/CL file. This event includes “ActionCircularMotion” as standard. “ActionCircularMotion” runs either :ref:`Format Motion Circular`. or :ref:`Format Motion Helical`. commands depending on whether the motion is circular or helical.