On Wednesday 25 November 2015 07:55:19 andy pugh wrote: > On 25 November 2015 at 12:21, Gene Heskett <ghesk...@wdtv.com> wrote: > > what would be a feed speed that would keep it > > busy making decent sized chips for its size, but w/o overstressing > > the mill? > > Have you considered using HSS bits? They might well have a sharper > edge, and are rather tougher.
No, I hadn't Andy. These are pcb mills, sharp enough to draw blood quickly if the back of my hand touches it, and if cutting into the glass subtrate of a pcb, do manage to stay sharp quite a while. But I haven't a clue how one would compare the abrasiveness of the ebony with that of the FR4 glass in a pcb. I just woke up from a morning nap and warmed up my coffee cup. The thought of switching to the roundover tool, which has a very sharp point, and letting its tip dig the first .125" is getting tastier all the time. That should not take any path adjustment, just the finished depth of cut. That I can put in the gcode in 2 minutes or less. And that will be doing half the teeny mills work for it. And while I could switch to a 1/16" mill, I only have one of those, but 3 more of the little ones. And switching to a 1/16" would cost me a button per row, leaving lots more scrap. So I'll see how this goes this morning. Now if someone could suggest a feed rate for 2500 revs on a 2 flute thats not digging near as deep on a per pass basis? When I have 132 of these in 1/2" square to make for the upper portion of these boxes, I don't want to spend a week making them because the feed rate times number of passes is too slow. Its over 33 minutes for 4 of these right now if there aren't any hiccups. The snapshot4.jpg I sent is of the end buttons for the lids breadboard, 4 per lid, so I only need a dozen of those. Grain of the ebony is long ways of the pattern. But this ebony is only 2" wide, so one piece should do it if I can salvage the broken tool in gcode. What I have ordered, from Cooks, is wider & longer but thinner, so while I'll have less scrap from the wider stuff, I'll also get fewer slices. I like Cooks, you get the exact piece in the picture on the web page. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
