... guide to the preferred requirements for producing quality Printed Circuit Boards. Can be supplied as artworks, penplots, photoplots or photoplot files, so long as | PRINTED WIRING BOARDS FAB | the quality and registration of the images is of a standard that will enable a good quality board to be produced. Another important criteria is | PRINTED WIRING BOARDS FAB | the presence of orientation marks within the boundary of board. These marks could be the board reference so long as it cannot be read from | PRINTED WIRING BOARDS FAB | the other side. (This is for your protection to prevent the boards made inside out). Images should comply with design rules that will result in | PRINTED WIRING BOARDS FAB | a board that will meet performance and cost requirements. - Scale must be given, tapes securely stuck to the backing sheet, track to pad & | PRINTED WIRING BOARDS FAB | track to track joints complete and the backing sheet clean. - Scale must be given and be at least 2:1. Plots must also offer sharp | PRINTED WIRING BOARDS FAB | edge definition and traces dense enough for blocking light when photographing. - Preferred on 7mil (178mm) thick base for stability. ...
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... With the information in this format coming directly from the engineering CAD system, there's no danger of the fabricator "reverse engineering" the netlist from | PRINTED WIRING BOARDS FAB | the Gerber files. Next up are the internal plane layers. For some reason, CAD engineers like them to be "positive," but those types of layers | PRINTED WIRING BOARDS FAB | lead to huge file sizes. Negative plane layers are usually preferred by fabricators because they're easier to work with and have smaller file sizes than | PRINTED WIRING BOARDS FAB | positive layers. Remember, boards are manufactured en masse and must be stepped out into a panelized form. The result: Data sets with lots of unnecessary | PRINTED WIRING BOARDS FAB | positive planes swell exponentially, bog down CAM systems, and crash photoplotters. After the basic prep work is completed, step into the fabrication analysis arena, where | PRINTED WIRING BOARDS FAB | the game is one of checks and balances. You've got your design rules; fabricators have theirs. Checks and balances can resolve any conflicts between the | PRINTED WIRING BOARDS FAB | two. Take soldermask layers, for instance. Often, these ...
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... Circuit Board and Multilayer Boards Technology ! Krefeld- The drilling correction of the inner-layer alignment is still the greatest quality risk in the production | PRINTED WIRING BOARDS FAB | of multi-layers. Until now, in order to maintain an acceptable reject rate, many extremely machine-intensive work steps have been necessary (e.g. the use of x-ray | PRINTED WIRING BOARDS FAB | machines). Thanks to a revolutionary technique developed In cooperation with the Lenz Company and the Frauenhofer Institute, for which a patent has been applied, we | PRINTED WIRING BOARDS FAB | have managed to eliminate the quality pifalls as well as to combine all of the work steps, from stock recognition to CNC drilling into one | PRINTED WIRING BOARDS FAB | step. The advantages for cost and competiveness are immense ! The Problem Multi-layer pressing can only guarantee the best innerlayer adhesion if the fibre glass | PRINTED WIRING BOARDS FAB | mats soaked in epoxide resin (prepregs), positioned between the innerlayers as a dielektric medium, gel. As a result of the high pressures (150 bar) and | PRINTED WIRING BOARDS FAB | temperatures (175 C) applied the resin ...
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