5. When the cutting head touches the presetting block, it stops and records the current
coordinate of Z axis, as shown in the figure, S1 = 50mm. At this time, the actual head
presetting position SZ = S1 + H (the position where hitting the presetting block + the
height of the presetting block) Record and save. In the end, the rotary cutting heads return
to the Set Point. So, the automatic head presetting is completed.