1. With the rise of fully automatic insertion machines in PCB manufacturing, there has been a significant increase in demand for high-quality punching in single-sided PCBs and other substrates. This has led to heightened concerns over punching quality, including issues like burrs, copper foil aperture bumps, and misalignment. This article discusses common defects in PCB punching and their solutions. 2. **Glitch Cause:** – Cracks on both sides of male and female molds due to insufficient gap, leading to shears at section ends. – Excessive gap results in delayed cracking during male mold descent, causing tearing-like shearing and non-overlapping cracks.