PCB and PCB designs have in common, however, is their reliance on quality Gerber files. Gerber files are the digital blueprints of your PCB, the layer-by-layer input for the PCB manufacturers that detail the manufacturing and fabricating process. Gerber files mistakes can be disastrous for a PCB manufacturer, leading to manufacturing errors and printed circuit boards that fail prematurely or do not work at an optimal level.
Avoiding Gerber files problems so that these files are complete and accurate is critical to making sure each printed circuit board comes off the line able to perform according to specifications. Here are some of the most common Gerber file issues PCB manufacturers encounter and what they can do about them.
- Empty Gerber Files: Believe it or not, it is possible for the designer to create Gerber files with no information in them, or “zero-byte” files. Whoever is reading the file will not know if the file is completely extraneous or if there was information in it that was accidentally deleted. Designers must check each Gerber file to make sure it contains useful information before sending it on.
- Missing or Incomplete Files: This is almost the opposite problem. Manufacturers need to know each specification related to the printed circuit board, from the size of the plated-through holes to the dimensions of the board. Any missing information will likely lead to a board that does not match the desired specifications. It’s important to make sure each necessary Gerber file is in place and accessible.
- Bad File Labeling: While not a catastrophic error, it is highly recommended that the designer name all Gerber files according to an established naming protocol the manufacturer understands. This way, the manufacturer can immediately find the Gerber file he or she needs without any confusion as to whether or not they have the right file.
- Too Many Aperture Lists: The Gerber files should ideally have a single aperture list with all the details the manufacturer needs about the tools they require for each stage of fabrication. Multiple aperture lists create confusion, can slow down manufacturing and may increase the chances of error. Also look out for designers who create aperture lists in a different format than the Gerber files, which can lead to confusion as well.
- Composite Layer Design Errors: If the designer’s software creates composite layers while generating individual layer design specifications, it’s important that the images are combined in a way that creates one Gerber file for each layer, to avoid errors.
Of all the potential problems you may have with your printed circuit boards, Gerber file mistakes are the most inexcusable. While most PCB design errors can be avoided with more careful and focused work, Gerber file errors are the easiest to avoid. Given that the consequences of Gerber file issues can be so expensive and so time-consuming, you simply cannot allow them to happen. A few ways to help you avoid Gerber files problems include:
- Using a Gerber file viewer to check the Gerber files
- Printing a sample board to make sure the specs are correct
- Using high-definition CAD software
- Following best QA practices throughout the design process
If you order your printed circuit boards from Millennium Circuits Limited, you won’t have to worry about errors stemming from Gerber files problems. We do rigorous quality assurance, including a Gerber file check, to make sure the printed circuit boards you receive will be of the highest quality and perform at or above your expectations.