274D data does not need any manipulation and can be used immediately (skip this section and go to Reverse Engineering Procedure). First, figure out what kind of Gerber data you have. If all reference designator are not known, you can make them up as you go.
If the silkscreen layer is incomplete, then get a fabrication drawing, BOM or some other method to determine each reference designator.
Before starting make sure that you know what each component's reference designator is. 1 CAM350 Tutorial - Reverse Engineering a PCB Written by Advanced CAM Technology, and modified by Michael Raynes, Aspect Communications Getting "legacy" designs, where you only have Gerber files, back into your CAD system - intelligently This is the process of starting with Gerber files then adding information to the database such that an intelligent database can be brought back to a CAD system.
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