After setting according to the processing data, before starting processing, increase GAP by 1 segment, decrease SERVO by 1 segment, and adjust I to 1 (minimum). After starting processing, when touching the workpiece, increase I every 2 seconds. After processing and adjusting to the set value of I on the processing data according to this process, increase SERVO and increase GAP by one segment (GAP can be adjusted to maintain between 25V ~ 30V according to the instructions on the V meter). When the processing reaches the perforation (bottom) Sparks appear), first reduce I by 2~3 steps, then reduce ON by 2~3 steps, at the same time increase GAP by 1 step, and SERVO by 1 step until the copper pipe is fully penetrated.