TCP is a term that is often mentioned in 5 axis cnc milling machine, its called Rotated Tool Center Point,this is what we often call the tool tip following function.
In five-axis cnc router machine, when pursuing the tool tip trajectory and the posture between the tool and the workpiece, additional movement of the tool tip is generated due to the rotational motion. The control point of the CNC system often does not coincide with the tool tip point, so the CNC system must automatically correct the control point to ensure that the tool tip point moves along the specified trajectory.