{"id":3646,"date":"2023-11-16T11:12:09","date_gmt":"2023-11-16T03:12:09","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=3646"},"modified":"2026-10-02T16:48:50","modified_gmt":"2026-10-02T08:48:50","slug":"mechanical-drilling-of-circuit-boards","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/mechanical-drilling-of-circuit-boards\/","title":{"rendered":"An Introduction to Mechanical Drilling Techniques for Printed Circuit Boards"},"content":{"rendered":"

In the PCB drilling process, aside from laser drilling, mechanical drilling has always been the primary method for creating holes in circuit boards.<\/p>\n

The basic mechanical drilling process is as follows: Secure the laminated circuit board in the reference position according to the allowed number of layers; place the lower support plate beneath the upper cover of the protective cover; then, after laminating the entire stack of circuit boards, insert the rear pins into the mounting holes on the drilling machine\u2019s worktable to begin drilling.<\/p>\n

\"Mechanical<\/p>\n

1. Drill Press Table<\/strong><\/h2>\n

Stacking circuit boards helps improve production efficiency. However, the number of layers to be stacked must be determined based on the size and precision of the holes. The smaller the holes, the fewer layers that can be stacked, and the higher the precision required.<\/p>\n

The cover plate and back plate play a critical role in the stacking process. The cover plate allows the drill bit to cut more smoothly and prevents burrs. It also helps control drilling temperature and improves drilling quality.<\/p>\n

Materials typically include aluminum alloy sheets, aluminum sheets, and urea-formaldehyde boards. The backing board serves as a sacrificial layer to prevent fuzz from forming on the bottom surface. Commonly used materials include phenolic paper and wood pulp boards.<\/p>\n

2. Drill<\/strong><\/h2>\n

Mechanical drill presses use CNC data to control movements such as worktable translation, spindle elevation, high- and low-speed operations, and drill bit changes. This type of CNC drilling process requires a mechanical origin. The X-Y movements, together with the Z-axis spindle movement, control the position and diameter of the holes.<\/p>\n

3. Drill bit<\/strong><\/h2>\n

Drill bits are essential for creating holes in circuit boards. They must have the proper shape and dimensions to ensure high-quality drilling. Undercut drill bits feature a tapered design to improve the smoothness of the hole walls and reduce adhesive residue.<\/p>\n

In terms of materials, tungsten carbide superhard alloys are commonly used to improve wear resistance and service life. Drilling through circuit boards involves cutting through hard materials such as fiberglass and copper foil.<\/p>\n

4. Post-processing and Inspection<\/strong><\/h2>\n

After drilling is complete, the quality of the holes on the circuit board must be inspected, including hole placement, diameter, and number of holes. Missing holes can be identified through spot checks and comparison with the working film.<\/p>\n

Automatic inspection equipment can inspect hole locations and diameters to ensure quality.<\/p>\n

Visually inspect the surface of the circuit board for scratches and other damage. A 3D microscope can be used to examine the inside of the holes.<\/p>\n

We hope this article has provided you with a comprehensive overview of mechanical drilling techniques for printed circuit boards.<\/p>\n

\n

FAQ<\/strong><\/h2>\n

1. What is mechanical drilling, and what role does it play in circuit board manufacturing?<\/strong><\/h3>\n

Mechanical drilling is the primary method used to create holes in printed circuit boards.<\/p>\n

2. Why do printed circuit boards need to be drilled in layers?<\/strong><\/h3>\n

Stacked-disc drilling improves production efficiency while ensuring hole diameter accuracy and quality.<\/p>\n

3. Why is the material of the drill bit important?<\/strong><\/h3>\n

The material of a drill bit affects its wear resistance and service life, as well as the quality of the hole.<\/p>\n

4. Why is inspecting the holes on a circuit board so important?<\/strong><\/h3>\n

The quality of the holes affects the functionality and reliability of the circuit board, so they must be carefully inspected.<\/p>\n

5. How do automated inspection systems in printed circuit board manufacturing improve quality?<\/strong><\/h3>\n

Automatic inspection equipment can check hole locations and diameters with greater precision, improving the consistency and quality of circuit board manufacturing.<\/p>","protected":false},"excerpt":{"rendered":"

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