What Design Data is Needed to Make a PCB?
To actually build a PCB board the manufacturer needs quite a few pieces of data from the designer. I’ve summarized the data and its function below: Gerber Files – these are actually “CNC” files which drive a photoplotter which creates the film used to expose each conductor layer in the board. There is also a Gerber file needed for other processes such as solder masks on top and bottom, paste masks and silk screens. So a four layer board could have 8-10 gerber files associated with it. Drill Files – these are CNC files very similar to Gerber (but different) that are used to control a drilling machine. Plated through holes have to be drilled. On multi-layer boards you can have some holes that go all the way through, some that only go through a few layers and such. These each require a different drill file. There are lots of aggravations with drill data – first, there is no consistent standard as to how the drill tools should be defined in the header; second the coordinate system of the d
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