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The current text on patterning method by volume contains the following:
Silk screen printing–the main commercial method.
Photoengraving–used when fine linewidths are required.
I do not believe that silk screen printing is the main method, I believe photo-engraving is. (The statement is unreferenced.) I know quite a number of manufacturers, and few use silk screen printing, but I have no statistics, proof or references. Consequently, I am not comfortable to make statements about this. Still, I would like to change the text as follows, sidestepping the volume question.
Photoengraving – used when fine line widths are required.
Silk screen printing – used for PCBs with thicker lines.
Are there burning objections? Or does anyone has references about this?
An IP editor recently tried to move the history section to the top . That was reverted by User:Karloman2 with the comment "I dont think history comes first. People looking at this article are probably not interested in the history." I agree that history should not be at the very top, but on the other hand I don't necessarily agree that it should be relegated to the very bottom. There should be enough in front of history to explain what the subject is all about and introduce terms that might be used in the history. Karloman, you are making assumptions about why readers come to an article. Those who work with pcbs and understand the technicalities would be ill advised to come to Wikipedia for technical information. For the general reader of a technical article, the history is often the most accessible and easily understood part of the article. It may even be what they came to the article to find. SpinningSpark 07:57, 6 September 2015 (UTC)
Well, one has to make assumptions on why readers come to an article, I think, otherwise it is not possible to write it. One can only hope these assumptions are not too far off. Whatever, I fully agree with you that the history must not necessarily be put at the very bottom. I suggest putting it just after, or maybe just before, the section "PCB Characteristics".Karloman2 (talk) 10:22, 7 September 2015 (UTC)
Straight onto boards before exposing them, I laid out my first that way. did my 2nd with 1:1 tape onto a board (1 sided, early-mid '70s). And for photo-lithography, I'll bet freehand drawing was used as well, the Flipchip in the 2nd photo looks like it might have been hand drawn, not done with tape. Note the short thick section in the bottom trace, inconsistent with tape, but not with pen and ink, and in general doing curves like that with tape would have been a real pain. Hga (talk) 19:17, 8 November 2015 (UTC)
I've still got such a pen. Don't think that it's a viable technique any more though, electronics has got too small for that. I don't think you are right about the board being done freehand. The roundels are too round and the trace widths are too consistent. The thick piece you point out looks like a solder blob to me. Curves are actually quite easy with crepe tape, which is what we used to use, especially with thinner traces like on this board. The clincher for me is that the top trace goes off the boundary of the board, a very unlikely mistake for someone drawing directly on to the surface. SpinningSpark 20:28, 8 November 2015 (UTC)