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 ------------------------------------------------------------------------- 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
