Convert GBR to NC

Understanding GBR and NC file formats

GBR files, also known as Gerber files, are standard file formats used in the electronics industry for PCB (Printed Circuit Board) design. They contain information about the layout of a PCB, such as copper layers, solder masks, and silkscreens. NC files, or Excellon drill files, are used to control CNC drilling machines for creating holes in PCBs. These files specify the locations, sizes, and types of holes to be drilled.

Why convert GBR to NC?

Converting a GBR file to an NC file is essential when you need to generate drill instructions from a PCB layout. While Gerber files describe the visual and electrical layout, NC files provide the precise drilling data required by manufacturing equipment.

How to convert GBR to NC

To convert a Gerber (GBR) file to an Excellon (NC) drill file, you typically use PCB design or CAM (Computer-Aided Manufacturing) software. Here are the steps using KiCad, a popular open-source PCB design tool:

1. Open your PCB project in KiCad's PCB Editor.
2. Go to File → Plot.
3. In the Plot dialog, select the layers you want to export as Gerber files.
4. Click Plot to generate the Gerber files.
5. To create the NC drill file, click Generate Drill Files in the same dialog.
6. Configure the drill file options as needed and click Generate Drill File.

The resulting .drl or .nc file can be used for CNC drilling machines.

Best software for GBR to NC conversion

• KiCad – Free and open-source, supports both Gerber and Excellon file generation.
• Altium Designer – Professional PCB design suite with advanced export options.
• EasyEDA – Online PCB design tool with built-in Gerber and drill file export.
• Gerbv – Open-source Gerber viewer that can help verify files before conversion.

Tips for successful conversion

• Always verify the generated NC file using a viewer or CAM tool before manufacturing.
• Ensure drill sizes and locations match your PCB design requirements.
• Check for compatibility with your PCB manufacturer’s requirements.