Then, click the leftmost All checkbox by the corresponding sub-class for the layer you are making (e.g. These are based on Views that you may already beįamiliar with while making the layout since they are useful in switching In OrCad/Allegro, these Gerber ‘layers’ are referred to as ‘ films’, a reference to how photo imageable films are used to print the pattern onto the board.īefore we export these, we’ll make some data-sets containing Layers to make PCB stencils, you can export them in a similar way. Make sure you export all the copper layers as necessary. Pretty much essential for a typical two-layer board. To begin with, what we and most PCB fab houses typicallyĪpart from the silkscreen layers, all the other layers are So, if you are struggling to export PCB Gerber files from OrCad or Cadence Allegro successfully, we hope this guide will help you with your woes once and for all. We once had an entire class of students fumble with problems with board outlines and just getting the bare minimum data to us was a pain.
Methods for exporting Gerber files from OrCad/Allegro vary and are sometimes incomplete or not fit for the purpose of sending off the data to be manufactured for example with the Seeed Fusion service.
While the built-in documentation is comprehensive, simple, up-to-date and jargon-free guides for OrCad/Allegro are rather scarce. But actually, the export method has a lot in common with Eagle and is difficult to get wrong with this method. And we can’t help give off a little sigh every time we see the. The number of steps involved to just export a set of Gerber files leaves us craving a CAM file feature like in Autodesk Eagle. This comes at a price though, for both the user and PCB fab houses, particularly when it comes to exporting Gerber files for manufacture. It’s probably for this reason why OrCad/Allegro is still very popular and is often the software of choice for schools and businesses. On the other hand, despite the steep learning curve, those weaned on the software find the level of customization and detail appealing, and develop a better overall understanding into what makes a printed circuit board and, more importantly, how this is communicated in the production files. Those used to more beginner-friendly and self-explanatory programs such as KiCad and Eagle may be driven crazy by OrCad/Allegro’s counter-intuitive design flow and excessive right-clicking (me included). The software takes a bottom-up approach using various tools to make individual parts from pads to the final PCB layout. Cadence Allegro and OrCad are the oddballs of the PCB EDA software giants.
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