Documentation needed in the PCB manufacturing process

PCB manufacturing is a complicated technological process that requires appropriate production files. Depending on the program in which you design your files, their extensions have different names. Production files for the production of PCBs are GERBER files. They define specific layers in the physical design of the PCB, and each file corresponds to one of them. However, in order to define drilling holes or milling parameters, the preferred format is Excellon.

ExtensionLayer
DRL lub TXT Drill
GTO Top Overlay (Silkscreen)
GTS Top Soldermask
GBS Bottom Soldermask
GTL Top Layer
GBL Bottom Layer
BRD Board
GKO Keep Out Layer
GTP Top Paste
GBP Bottom Paste
GPT Top Pad Master
GPB Bottom Pad Master
PHO Photoplotter
RPT Report
GMx Mechanical Layer X (x corresponds to the layer number)
GPx Inner Plane Layer X (x corresponds to the layer number)
PX Gerber Panels (x corresponds to the layer number)

Important tips that shall facilitate and improve the manufacturing process:

1. please complete the technology card carefully (here’s the link);

2. please make a stakcup (stretches of PCB layers) in a descriptive form, e.g. txt file or graphic or on a mechanical layer, and describe the layers with the appropriate names of production files;

Evatronix PCB production Stakcup

3. please create a contour / milling layer on a separate layer. Be sure to keep the right distance between the copper & the cutter and the edge of the board so that it does not get damaged. Ideally, during the design process, add the Keep Out layer to help maintain the required distance;

4. with the required impedance check, please create the appropriate table or description of requirements;

5. please optimize the number of defined diameter of holes and drillings, which reduce production costs. Metallized (PTH) and non-metallized (NPTH) holes should be marked accordingly (it is best to make separate drilling files or a drilling map). In the case of buried or blind vias, separate drilling files should also be made for their range in the stackup (from which to which layers it applies, which layers it connects) and describe them accordingly. Please specify the tolerance as well;

6. please create the descriptive layers / silkscreen / screen printing in a way that they do not overlap the pads - such descriptions will be cut in the production process;

7. if the connector edges must have the appropriate dimensions and tolerances, please create a illustrative drawing as presented below:

Evatronix PCB production Sketch 03


If you have any problem with generating/creating production files, please contact us. Our technical department will be pleased to answer all your questions and help you erase any doubts.

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