--- On Thu, 4/18/13, Kent A. Reed <kentallanr...@gmail.com> wrote: > From: Kent A. Reed <kentallanr...@gmail.com>
> > On 18 April 2013 08:48, Gregg Eshelman <g_ala...@yahoo.com> > wrote: > >> How are molds for plastic reflectors machined? They > have a large number of sharp edged corner cubes. > > Possibly forged with a pyramidal punch? > > > Take a look at http://www.nissin-precision.com/english/Rrm.htm > > Regards, > Kent Lots of little hexagonal pins with highly polished, three sided ends, all bound tightly together. Used as is or an electroformed surface is made from the pin masrer. Looks like metal is cast against the back side of the electroform then machined to insert into a plastic injection mold. I make cast resin copies of reflectors and lenses for classic cars. With a good original an RTV silicone mold can exactly copy the reflective quality of the original lens. So now I know how the originals are made. ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
