7 Critical Gerber File Mistakes in PCB Manufacturing and How WellCircuits Prevents Them

In international PCB export business, proper Gerber file preparation significantly impacts production timelines and product quality. As a leading PCB manufacturer in China, WellCircuits identifies these common errors that delay global shipments and increase costs for import/export partners.

1. Missing Aperture List: The Foundation of Precision Manufacturing

An aperture list defines tool shapes and sizes for creating pads and tracks – crucial for high-volume PCB production. For international buyers, we recommend:

• Use 274X format with embedded aperture lists (industry standard for export)
• Avoid modifying software-generated aperture definitions
• For legacy 274D format, verify accompanying .rep/.apt files

2. Excellon Drill File Omissions: Global Compliance Requirements

Proper drill files ensure CNC machines meet international PCB specifications:

“Export-quality PCBs require ASCII format drill files with 2.4 trailing zero suppression – a common oversight for overseas buyers.” – WellCircuits Technical Team

Key parameters for cross-border shipments:

• Combined plated/non-plated holes in single file
• English units (imperial measurements)
• No steps/repeats for manufacturing clarity

3. Tool List Specifications for Export-Ready PCBs

Tool lists complement drill files for global PCB fabrication:

• Embedded tool lists reduce supply chain errors
• Software-generated .tol/.rep files preferred
• Avoid manual fabrication drawings for international orders

4. Complete Gerber File Packages: Essential for International Trade

Missing Gerber files halt PCB export manufacturing immediately. WellCircuits advises:

• Verify all layers before overseas shipment
• Confirm 274X/274D format requirements
• Utilize our file conversion services for non-standard formats

5. Annular Ring Specifications for Reliable Global Exports

Proper annular rings ensure PCB reliability during international transit:

• Minimum .005″ for vias (critical for multilayer PCB exports)
• .007″ minimum for component holes
• Maintain consistent copper spacing

6. Copper Trace Standards for International Compliance

Trace width/spacing affects PCB performance in global applications:

• .005″ minimum width/spacing standard
• DFM checks prevent export rejections
• Adjust for high-current international applications

7. Inner Clearance Requirements for Overseas Shipments

Proper clearances prevent shipping damage and field failures:

• .015″ preferred clearance (minimum .010″)
• Critical for plated/non-plated holes
• Prevents inner layer shorts during international transport

Streamline Your Global PCB Procurement

WellCircuits’ China-based PCB manufacturing expertise helps international buyers avoid these common Gerber file mistakes. Our export-ready solutions include:

• Pre-shipment design verification
• Automated DFM checks
• Global logistics compliance

How to ensure error-free Gerber files for international PCB orders? Contact WellCircuits’ export specialists for a complete manufacturing checklist tailored to your regional requirements.