To bring commonality to what we were trying to clean up, the mechanical layer list, which we call 'Rev 1', was created. Some of the designs only had PDFs of the schematics. Some of the designs only had Gerber files. Some of the designs had been designed with other tools. This list came from a large project we assisted for a company that was pulling together all their designs (about 50) scattered about in various hard drives due to mergers and acquisitions. In 2017, we released our recommended mechanical layer list. The time it takes to review and ensure that the imported library footprint is valid is about the same time necessary to create the footprint from scratch. It is to note that Nine Dot Connects generally does not recommend starting with a 3rd party library, given that there is no assurance or guarantee that the part has been correctly designed and vetted. Knowing this can make footprint creation easier if one starts from these libraries. For example, the libraries Altium and Octopart (owned by Altium) have the same layers for 3D bodies, assembly, and courtyards. Though Altium does not have an official list of recommended layers, their implicit recommendations are built into their libraries. Though this is certainly useful for those consultants and services that must work between their internal practices and customer needs, this can only be looked upon as a quick fix for a given project and will still require some effort to ensure that all mechanical layers are correctly represented when there are differences between two or more PCB files. In Altium Designer 18, Altium has introduced 'layer types' so that there can be some mapping of commonly used mechanical layers such as assembly, courtyard, and 3D bodies that may have been allocated to different layers between the PCB layout (.PCBDoc) and library files (.PCBLib). It makes finding things in Allegro a bit more challenging.Īltium Designer provides mechanical layers and allows the user or company to define the layer. In tools such as Cadence Allegro, mechanical layers are very well defined. Altium Designer is different from other tools in that Altium does not predefine its mechanical layers. Several years ago, we decided to put out a list of recommended mechanical layers for Altium Designer (Click Here).
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