On Wednesday 21 January 2009, Patrick Dupre wrote: >Hello, > >After I made a pcb, can I duplicate it on the same silk ? >Then I go get several at the same time. > >Thank
If you mean making another pcb by using the same silk, yes. We used to do that 40 some years ago at a tv station, where such things as audio and video DA's are often used by the dozens. But because the silk will dry and clog up if you don't very carefully rinse all the ink out of it, You should do as many as you need plus another 25% or so for future expansion use when the silk is ready to use. When we cleaned the silk up, it was total, and then ready to re-use for the next board we made. The same silk & frame will last for several years worth of small production runs if cared for. Today though, with the narrower traces commonly used, I'd suspect the hand work to fix holes and smears would probably soon drive you to a photographic resist process. Or to cutting machinery, needing no etch chemistry at all, just a good board scrubbing when its done from the plating of thru holes and via's. That plating was the one process we didn't have the stuff to do, but our spray etcher could preserve our notes written in the 10x10 when reduced 4/1, perfectly readable at .025" high in the copper, which amazed me in the middle 60's when I was doing it. Seems like silk screen for pcb's would be rather arcane technology today though. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Message from Our Sponsor on ttyTV at 13:58 ... _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user