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What is KiCad?KiCad is a free, easy to download software that is used for electronic design automation (EDA) and computer aided design (CAD). While using this program, PCB design schematics can be realized from their electrical circuits. Within, there are tools that allow the creation of a bill of materials (BOM), artwork, 3D view of the PCB + components and gerber files. This documents purpose will be to guide Bittele’s clients through the step by step process specifically for generating the gerber files using KiCad. Similarly, a guide for exporting gerbers using another commonly used program (Eagle) can be found here.
What are Gerber files?Gerber files are the artwork of the layers that will be used to construct the board once it’s being fabricated. The industry standard file type used for manufacturing and assembling PCB’s are gerber file types. Therefore, they are easily recognized and processed by our manufacturing equipment.
Generating Gerber FilesThis guide assumes that you have finished designing your PCB within KiCad and are ready to export the gerber files.
1) Select the ‘Plot’ button (located next to the printer icon).
This will open the plot window.
The image above shows the many different layers that are used in this example project. In general, there are only 10 layers that are required for PCB fabrication and assembly (paste layers not required for fabrication only):
3) Under the messages window will show where the drill files have now been generated. Click on the close button to return to the previous window. Click on ‘Plot’ (beside Generate Drill File). The gerber files for the layers will be generated (shown once again under the messages window), then click ‘Close’.
4) Once your gerber files have been generated, they can be reviewed to catch any potential errors before being sent to us for a PCB fabrication quote. Return to the main KiCad project window and click on the GerbView – Gerber viewer button (see image below):
5) On the window that pops up, click ‘File’ > ‘Load Gerber File’.
6) Select all of the layers shown and click ‘Open’.
7) In the same manner, click on ‘File’ > ‘Load EXCELLON Drill File’.
8) Select the drill file(s) and click ‘Open’.
Notice here that 2 drill files have been created. The first represents ‘plated drill holes’ while the second represents the ‘non-plated drill holes’. This will lead us to seeing 11 files instead of 10 files later.
9) Once all of your layers have been imported into GerbView, you can perform all your final checks (you can view each layer one by one and so on). Once you are satisfied that your design is correct, you will be ready to quote and order your boards.
10) Navigate to the directory on your computer where your KiCad project resides. Select and zip the following 11 files:
A list explaining each type of file can be seen below:
This guide’s aim has been to describe the procedure for generating Gerber files from KiCad as simply and completely as possible. If you still find yourself unclear on any part of the process, please do not hesitate to contact US: firstname.lastname@example.org or wechat:+8613691605420
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