Introduction
A circuit board cannot be manufactured before you complete its design. This is where you will find the Gerber file format, which is the PCB industry’s standard blueprint. Knowledge of how to open Gerber files is a very crucial skill for all designers. This guide will demonstrate to you how you can easily and effectively do it.
What are Gerber Files?
It is a standard file in the industry that gives the guidelines for creating your circuit board. Gerber file format became the standard because it’s an open-source file format that guarantees that any manufacturer can read your design correctly. It takes basic text instructions to outline all the details, down to copper layers and silkscreen. Each file you will notice as an open .gbr file represents one layer on your PCB.
Types of Gerber Files
Your entire PCB design does not consist of one file, but a package of multiple associated Gerber files. Just imagine it as a set of instructions, and every file would tell you about a separate manufacturing process. Viewing Gerber files with a Gerber file reader lets you see the combination of these layers. Knowing what every. A GBR file can make a successful design review. The most common file types that you can find are:
- Copper Layers: This file presents all the conductive copper paths and pads on your board. Manufacturers use it to etch the circuits that enable your electronics to work.
- Soldermask Layers: It is a layer that determines the destination of the protective soldermask coating. It also reveals the holes, exposing the pads you use to solder components.
- Silkscreen Layers: In your silkscreen, you have the reference text, component outlines, and logos. This is printed on the surface of the board so that it can be easily assembled and recognized.
- Drill Data: Drill data files give you the precise X-Y position and size of each hole. These files will guide the CNC drilling machines in the fabrication process.
- Assembly & Mechanical Layers: These files provide the shape of the physical board, including cut-outs or shapes. They also give the specific mechanical sizes required during production.
- Netlist: A netlist is an indication of the electrical connections that are intended in your board. The information is used to run automated checks and to test circuit integrity.
The Best Gerber Viewer to Open the File
To open .gbr file packages, you must first have a special tool. Luckily, there are numerous online and desktop Gerber viewers, and many of them are free. With this Gerber viewer software, you can view your PCB design, make accurate measurements, and even print the board layouts through this tool.
Some tools are designed to only view Gerber files, but some are complete Gerber editors. An editor will not only allow you to review the design but also make necessary changes. The best tool can be selected depending on your needs.
Some of the best viewer tools are:
- ViewMate
- GerbMagic
- GerberLogix
- CAMtastic Gerber Viewer
- ZofzPCB
How to Open Gerber Files
It is easy to learn how to open Gerber files. The main thing you need to do is to select the appropriate Gerber file viewer. Desktop software can be downloaded and installed, or you can access a convenient Gerber viewer online. Both of those will enable you to check Gerber files successfully prior to production.
Opening Gerber Files in CAM Software
The CAMtastic Gerber viewer is a perfect dedicated CAM viewer which can be used with many projects. It is usually possible to find a good free gerber viewer to suit your requirements. Also known simply as CAMs, these tools are optimized to read gerber data and usually are able to act as a gerber editor. This implies that besides being able to visualize your design, you can also correct them in case you find anything wrong.
It is a simple process. This is the way you can check your files with Gerber viewer software such as CAMtastic:
- Install the Viewer: The first process is to download and install the software on your computer.
- Select Your Command: There is a variation on the workflow of some viewers. Depending on the program, you may have to open it and then choose the action to be executed, e.g., Import.
- Upload Your Gerber Files: Once you have chosen the command, you can go to the folder where your project is stored and open the files you are going to check.
- Visualize and Edit: The program will be able to render every level of your printed circuit board successfully. It is now possible to find any flaws and easily edit errors using the editor before you manufacture it.
Opening Gerber Files in PCB Design Software
In most projects, a dedicated CAM viewer will be an excellent choice of viewer, and you can usually find an excellent free Gerber viewer that will fit the requirements of your project. They are also known as Computer-Aided Manufacturing tools, which are specifically designed to view Gerber files and may also act as a Gerber editor. This implies that you cannot only see your design but also correct it when you find an issue.
Opening Gerber Files in Altium Designer
Altium Designer is a well-known PCB design system that also offers very good internal functionality for viewing Gerber files. It is an excellent Gerber file viewer, with which you can verify your manufacturing products inside the software. Here is what you need to do:
- Go to File > Import > Gerber File.
- Select the files you need to check and then modify the import mode to single-layer.
- Your imported files will be shown as new layers in the CAM document.
- You may use layer tabs to turn on the layers you wish to see.
- The rendered images can now be viewed, measurements can be made, and the design can be verified against your original PCB source file.
Opening Gerbers in Eagle CAD
Eagle CAD Premium comes with an advanced CAM Processor that can be used to open the packaged .gbr files. This tool lets you take an in-depth look at your manufacturing data before you forward it. This is how to use it:
- Select the option to enter the CAM editor.
- You can import your Gerber files into the job panel.
- Align the individual layers as required to have a clear view.
- Change between the various layers to examine them.
- Then you can overlay the layers and compare them to your original board file.
Viewing Gerbers in KiCad
Gerber files can be inspected and examined with the built-in GerbView in KiCad. It enables you to have complete control of layer visibility, transparency, and file management. Features may also be measured and images exported to review or document them. Gerber files opening instruction for KiCad:
- In the KiCad main menu, launch GerbView
- Go to File > Load Gerber Files to open your files
- Consider every file as an individual layer in the layer manager
- Use toggle layers so that they are isolated or combined
- Transparency adjustments are useful in the comparison of layers
- Take measurement tools and export images as required
Using Online Gerber Viewers
Online Gerber viewers represent an easy and quick means of examining PCB files without the installation of software. GerbLook allows you to load and view Gerber layers quickly inside your browser. These tools have simple capabilities, such as zoom, pan, and measure. It also allows users to export images or share viewable links to collaborate. They are perfect when it comes to fast inspection and remote teamwork.
Procedures to use an online Gerber viewer:
- Visit the web page at https://gerblook.org/
- Drag and drop your Gerber files on the page
- Use the sidebar to toggle the layer visibility
- Zoom, pan, and measure your PCB layout
- Export pictures or copy the URL when necessary
Converting the GBR File
You will often find PCB applications using Gerber files (GBR), but these cannot directly interface with other design formats. In order to use a GBR file in a different place, you will have to convert it. This is also the reason that many Gerber file viewers have basic editing and export options.
Using a proper tool, you are able to transform a GBR file into the following formats:
- DXFsss
- DWG
- TIFF
- SVG
Some online viewers also let you save your file as a PNG. In case you have the purpose of using the design on Adobe Photoshop, you have to first convert the GBR file to PNG. Afterwards, you can export it to Photoshop, where you can do more editing or corrections.
What Happens When You Can’t Open the File?
If you fail to open the Gerber file even after using various tools or changing its format, the problem may not be in the file itself, but in the file type. The .GBR extension is not limited to the PCB design. It is also used in fields like meteorology, which leads to a mix-up.
Confirm the file type again and ensure that the file type is a true Gerber file. Otherwise, you will require another kind of software. You should always verify the source of the file you are going to troubleshoot because you might end up wasting your time on the wrong tools.
FAQs
What Are Some Common Problems Found in Gerber Files?
Missing layers, improper drill data, overlap between traces, and control layer misalignment are some of the common problems with Gerber files. Most of the time, files don’t match the design intent because of export errors. A Gerber viewer should always be used in order to check and identify these issues before they are manufactured.
What Does Aperture Mean in Gerber Files?
In Gerber files, an aperture specifies the form and dimension of the drawing tool to be used to generate any features, such as pads or traces. It is like a stencil that defines the way elements on various layers are shown. An appropriate aperture configuration is used to prevent errors in the rendering of the PCB layout during fabrication.
Can Gerber Files Be Edited After Generation?
Yes, Gerber files are editable with special software. Gerber editors enable you to correct some small errors such as shifting of components, trace width or correction of labels. But when there are substantial modifications, you should just update your initial design in your CAD software, and re-export the files.
How Can You Validate Drill Data in Gerbers?
A Gerber viewer supporting drill files should be used to verify drill data. Examine the locations of holes, hole size, and copper layer alignment. Mismatched or missing drill info is pointed out by some viewers as well. Looking at the Excellon drill file and the Gerbers allows for correct manufacturing.
What’s The Best Way to Learn to Inspect Gerber’s Effectively?
Begin with free viewers such as GerbView of KiCad or browser-based viewers to train in loading and examining files. Emphasize alignment of layers, shapes of apertures, and the position of drill holes. Look through sample sets of Gerber and compare them to the planned PCB layout. Over time, you’ll spot issues more quickly and confidently.
Conclusion
You can now open a .gbr file with complete confidence. Viewing a Gerber file is an essential process that cannot be overlooked in design verification. This is a basic check, which safeguards you against time-wasting mistakes and production delay. Don’t forget to check your files to guarantee the success of your project.
Contact MV Flex Circuit today and send us your Gerber files. If you have a PCB manufacturing or assembly project, we will provide you with a free DFM/DFA check and a competitive quote. Send us an email now.
