-----Original Message----- From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of juanabba Sent: Sunday, March 18, 2007 1:48 AM To: Homebrew_PCBs@yahoogroups.com Subject: [Homebrew_PCBs] Re: paint board cooper image using silk screen - someone with experience Hi Kevin thanks for your answer I was talking to the professionals down here that produce the silkscreen mask, and I became very much sceptic whether the silk scren mask could transfer any line below 100 mil. They told me that the definition they have for the equipment that produce the mask is below 200 DPI. Is that the case at your country.??? how do you produce the mask, using professional services or DIY method??? Juan: Sorry for the delay. I did my silkscreen DIY. I bought a pre-stretched screen that is 230 mesh fabric, and used chromaline procap 30 capillary film for the emulsion on the screen. With my 400 watt metal halide lamp at 32 inches, the exposure time was about 35 minutes with an inkjet transparency made on 3M inkjet transparency stock. I tried a laser printer transparency, but there were way too many pinholes. The image is then washed out and dried. I screened white solvent based glossy ink onto the pc board and after drying, etched in CuCl. As far as how many mils you can do, all of the signal traces on the boards that I did are 50 mil traces, separated by 50 mils in the best case, and by about 20 in the worst case. I also did a 50 pin centronics connector that has .075" pads with .029 holes on about a 2.3mm x 5mm grid. All the holes in the pads showed and etched well eough to help guide the drill bit. There is a bit of a learning curve on how much to thin the ink, but once you get it right, screening the actual boards is really fast. If I quit being lazy, I'll take some pics and put them on the group site. I am confident that 20 mil traces would be possible with some practice Kevin Messages <http://groups.yahoo.com/group/Homebrew_PCBs/message/18192;_ylc=X3oDMTM2 dTkyOTMyBF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBG1z Z0lkAzE4MjA3BHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTE3NDIwNDE0MwR0cGNJZAMxODE5 Mg--> in this topic (3) <http://groups.yahoo.com/group/Homebrew_PCBs/post;_ylc=X3oDMTJxNGdvbWoxB F9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBG1zZ0lkAzE4M jA3BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTE3NDIwNDE0Mw--?act=reply&messageNum =18207> Reply (via web post) | Start <http://groups.yahoo.com/group/Homebrew_PCBs/post;_ylc=X3oDMTJlZGRkc3JlB F9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmdHIEc 2xrA250cGMEc3RpbWUDMTE3NDIwNDE0Mw--> a new topic Messages <http://groups.yahoo.com/group/Homebrew_PCBs/messages;_ylc=X3oDMTJlaTZtM 2kzBF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmd HIEc2xrA21zZ3MEc3RpbWUDMTE3NDIwNDE0Mw--> | Files <http://groups.yahoo.com/group/Homebrew_PCBs/files;_ylc=X3oDMTJmcDg3cGtt BF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmdHIE c2xrA2ZpbGVzBHN0aW1lAzExNzQyMDQxNDM-> | Photos <http://groups.yahoo.com/group/Homebrew_PCBs/photos;_ylc=X3oDMTJlb25iYWZ xBF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmdHI Ec2xrA3Bob3QEc3RpbWUDMTE3NDIwNDE0Mw--> | Links <http://groups.yahoo.com/group/Homebrew_PCBs/links;_ylc=X3oDMTJmdDY5NGN2 BF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmdHIE c2xrA2xpbmtzBHN0aW1lAzExNzQyMDQxNDM-> | Database <http://groups.yahoo.com/group/Homebrew_PCBs/database;_ylc=X3oDMTJjajZsM TBnBF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmd HIEc2xrA2RiBHN0aW1lAzExNzQyMDQxNDM-> Be sure to visit the group home and check for new Links, Files, and Photos: http://groups.yahoo.com/group/Homebrew_PCBs If Files or Photos are running short of space, post them here: http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ <http://groups.yahoo.com/;_ylc=X3oDMTJkdDg0aWc5BF9TAzk3MzU5NzE0BGdycElkA zQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMTc0M jA0MTQz> Yahoo! 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RE: [Homebrew_PCBs] Re: paint board cooper image using silk screen - someone with experience
2007-03-19 by Kevin Urbom