X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-ASG-Debug-ID: 1460631930-0978df121618377e0001-9re8WH X-Barracuda-Envelope-From: gheskett AT shentel DOT net From: "Gene Heskett (gheskett AT shentel DOT net) [via geda-user AT delorie DOT com]" X-Barracuda-Effective-Source-IP: n64s149.fttx.shentel.net[204.111.64.149] X-Barracuda-Apparent-Source-IP: 204.111.64.149 To: geda-user AT delorie DOT com Subject: Re: [geda-user] Some PCB output --> Printer etching Date: Thu, 14 Apr 2016 07:05:30 -0400 X-ASG-Orig-Subj: Re: [geda-user] Some PCB output --> Printer etching User-Agent: KMail/1.9.10 (enterprise35 0.20100827.1168748) References: <570F22A2 DOT 9090007 AT ecosensory DOT com> <20160414112519 DOT 62f1ebad AT wind DOT levalinux DOT org> <20160414114230 DOT 0f25de2ab2a04a81f3aa854f AT gmail DOT com> In-Reply-To: <20160414114230.0f25de2ab2a04a81f3aa854f@gmail.com> X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Disposition: inline Message-Id: <201604140705.30022.gheskett@shentel.net> X-Barracuda-Connect: smtp2.edbg.cloud.shentel.net[204.111.2.25] X-Barracuda-Start-Time: 1460631930 X-Barracuda-URL: https://204.111.1.146:443/cgi-mod/mark.cgi X-Barracuda-Scan-Msg-Size: 2526 X-Virus-Scanned: by bsmtpd at cloud.shentel.net X-Barracuda-BRTS-Status: 1 X-Barracuda-BRTS-Evidence: geneslinuxbox.net X-Barracuda-Spam-Score: 0.50 X-Barracuda-Spam-Status: No, SCORE=0.50 using per-user scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=6.0 tests=WEIRD_PORT X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.28728 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- 0.50 WEIRD_PORT URI: Uses non-standard port number for HTTP Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id u3EB5e3Q025014 Reply-To: geda-user AT delorie DOT com On Thursday 14 April 2016 05:42:30 Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote: > > On Thu, 14 Apr 2016 07:55:01 +0200 > > > > "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" wrote: > > > Photo resist work as great as the printing on the plastic film. My > > > printer does not print black areas perfect and I could see the > > > imperfections on finnished circuit board. > > > > I used to use two layers of the film on top of each other to > > overcome this problem. > > There are many tricks. I have read documentation for brother black and > white laser printer and they claim 1200 dpi resolution while most > other claim 600 dpi. Most sell color today but if lucky they spent > some extra on good quality instead. > > In the long rung I think DLP with UV light for direct printing is the > best solution. I think it is good limitation will be with etching > instead of printing. > From some experience I got making PCB's in the 1960's while at a small market tv station, we had a DEA brand s pray etcher. Detail reproduction was not a problem. In those days we worked with tape at 4x actual size to make the negative, then had it reduced at a photography place that had a 24" Brown camera to the exposing sized film. We had a layout grid in toothy plastic, and we often made notes right on the negative with each character inside the .1 x .1 grid. The note characters then were only 25 thousandths high & wide, and were perfectly reproduced in the finished copper. That etcher held about 2 gallons of ferric chloride that was pretty well used up by the time I made 3 or 4 boards with it in usually 4sies although the run could go to 30+ copies if it was a video distribution amplifier. Give it ten minutes to warm up the solution to about 110F, hang the developed boards vertically in it, and it sprayed like a windshield wiper against both sides of the board. Etch time was then getting slow so it took 8 or 9 minutes. It etched the sharpest detailed boards imaginable, only matched by todays board houses in the last 15 to 20 years. Disposing of that much ferric chloride when it was spent was a problem though. > > Nicklas Karlsson Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page