Types of Drilling Processes Single Pass Drill: The conventional method of drilling holes in PCBs where a bit passes through the PCB once to create a hole. Step Drill: A method to minimize bit breakage, where initially about 1/2 or 1/3 of the PCB is drilled and then the remaining portion is drilled to create the hole. Mainly used for thicker products. Double Drill: A method to enhance bit durabil..

Continuing from our previous session, let's further explore the PCB drilling process. Drilling Process 1. Principles of Drilling Process The process of machining PTH (Plating Through Hole) for interlayer circuit connectivity in the stacked panels and NPTH (Non Plating Through Hole) for alignment marks and assembly of fixtures. CNC (Computer Numerical Control) Drilling involves the use of automat..