On Tue, 25 Dec 2007 23:19:49 -0600 Jon Elson <[EMAIL PROTECTED]> wrote:
> Dave Engvall wrote: > > If anyone wants to etch a disc I can probably find an 30 mL or so > > of KPR. > > > KPR is abominable to work with. I have DuPont Riston dry film > photoresist. I have laminated it onto .005" and .003" brass > shim stock with my dry film laminator machine. It has heated > Silicone-coated rollers that press the film onto the substrate. > I have to shim the bottom side with cardboard as the machine > was set for .062" PC board material. > > I make two mirror-image films on my photoplotter and align them > on a light box before wrapping them around the laminated shim > stock, then expose, develop and etch like a PC board. I still > get some undercutting, my ferric chloride may be worn out. > > I've been using this to make solder paste stencils for SMT > circuit boards, but one could make an encoder with similar > technology. > > > Jon I've been using photo transfer with a laser printer and a bath of Hydrogen Peroxide and Muriatic Acid (28% Hydrochloric Acid) I don't know if it will resolve the lines fine enough but it does fly turd size resistor pads ok. Here's a link http://www.fullnet.com/~tomg/gooteepc.htm > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
