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58 The PCB Design Magazine • September 2015 by karel Tavernier uCAMCO It is clearly possible to fabricate PCBs from the fabrication data sets currently being used; it's being done innumerable times every day all over the globe. But is it being done in an efficient, reliable, automated and standardized manner? At this moment in time, the honest answer is no, because there is plenty of room for improvement in the way in which PCB fabrica- tion data is currently transferred from design to fabrication. This is not about the Gerber format, which is used for more than 90% of the world's PCB production. There are very rarely problems with Gerber files themselves; they allow images to be transferred without a hitch. In fact the Gerber format is part of the solution, given that it is the most reliable option in this field. The pro- blems actually lie in which images are transfer- red, how the format is used and, more often, in how it is not used. In this monthly series, Karel Tavernier explains in detail how to use the newly revised Gerber data format to communicate with your fabrication partners clearly and simply, using an unequivocal yet versatile language that enables you and them to get the very best out of your design data. Each month we'll look at a different aspect of the design to fabrication data transfer process. This article has been excerpted from the Guide to PCB Fabrication Data: Design to Fabri- cation Data Transfer. Chapter 2: Alignment (Registration) Never mirror or flip layers! All layers must be viewed from the top of the PCB, which me- ans that the text must be readable on the top layer and mirrored on the bottom layer. Alas, sometimes, in a mistaken attempt to be helpful, designers flip layers because they must anyway be mirrored on the photoplotter. This could be helpful in a world where the designer's files are used directly in fabrication, but these data layers are actually input for the CAM system. This ne- eds the correct 2.5D PC structure, so designers need to follow the standard protocol for provi- ding digital data. The fabricator's CAM system article The Gerber Guide chapter 2

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