So far, I have realized a number of mistakes. #1. I didn't wax the modeling board the first round, so the silicone surface is much too porous. Because of this, the surface releases bubbles during molding process and any residual moisture causes issues as well.
#2. The back suction action starting at gel?? time has to be considered, and material in place to handle it. I built a mold out of delrin for testing, and find that bubbles are far less a problem, almost non existent with the slow set material. #1 is deduced from this, in part. I still would like to try aluminum, but would have to outsource it. Firstcut seems pricey, http://www.firstcut.com/FirstQuote.aspx?p=574441wmiu http://www.firstcut.com/FirstQuote.aspx?p=574440fsir On Wed, Oct 2, 2013 at 4:20 AM, Sven Wesley <svenne.d...@gmail.com> wrote: > 2013/10/2 Steve Blackmore <st...@pilotltd.net>' > > > ... > > I've used West epoxy resins quite a bit, both lay up and vacuum bagged. > > It works very well and there is extensive help and documentation on > > their web site. It's a lay up resin, not a casting resin. If you mix a > > paper cup of the stuff and leave it, it gets so hot it will burn the cup > > and catch fire - done it :) > > ... > > > > Steve Blackmore > > -- > > > It all depends on the characteristics of the resin. I import, consult and > sell epoxy. I have a catalog of at least 30 different laminating resins and > at least half of them are good to go for casting and doesn't produce enough > heat to catch fire even in an isolated bucket. It depends on how aggressive > the hardener is, Most West System that is sold is pretty fast to avoid > dripping etc. And then you get heat, yes. > > Best regards, > Sven > > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most > from > the latest Intel processors and coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
