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Many hardware designers draw slots casually, only to run into major issues in production. Let’s break down critical DFM tips for drilling and routing to help you avoid costly mistakes. ### 🕳️ PCB Drilling Guidelines - **0.3mm** is the safe, standard via size for most projects. - The smallest drill bit widely available in production is **0.15mm**. - Smaller sizes are technically possible but extremely expensive and high-risk. ### 🔪 PCB Rout Slots (Key DFM Rule) Slots are milled with router bits. - The smallest standard router bit is **0.6mm**, but it’s fragile, slow, and prone to breaking. - Factories often reject or heavily surcharge jobs using 0.6mm router bits. ### ✅ Recommended Design for Manufacturability - **Slot width: ≥ 0.8mm** (strongly recommended) - If you need a minimum slot: **0.6mm** with **±0.1mm tolerance** clearly noted - Avoid designing 0.5mm slots with tight tolerances—this will almost always lead to delays, extra cost, or order rejection. ### 🧠 Final Takeaway - Vias: 0.3mm + annular ring 0.6mm - Rout slots: ≥ 0.8mm - Always leave tolerance for production. Good DFM = lower cost, faster lead times, higher yield. Have you ever had a PCB order delayed or rejected due to undersized slots? Share your experience below. 话题标签#PCBDesign 话题标签#HardwareEngineering 话题标签#DFM 话题标签#PCBFabrication 话题标签#ElectronicsManufacturing 话题标签#EngineeringTips 话题标签#JCLPCB