On 04/13/2017 02:24 PM, Erik Friesen wrote: > Free use terms = <$100,000 per year. > > Non Free = you should be able to afford it. > > On Thu, Apr 13, 2017 at 5:16 PM, Gregg Eshelman <g_ala...@yahoo.com> wrote: > >> Do test runs in wood or machinable wax or plastic. Could try spraying a >> dry graphite film on the cutter. NAPA auto parts has spray cans of that. >> Don't mill the crappy aluminum alloy. >> >> On Thursday, April 13, 2017, 8:46:03 AM MDT, Todd Zuercher < >> zuerc...@embarqmail.com> wrote:Here I go again. Unfortunately, the >> aluminum jig was a big hit, and now they want more. So I thought I'd take >> a crack at a trochoirdal milling path. My first try gave mixed results. >> Looking for advice. >> My CAM software still doesn't have a trochoirdal option, so a faked it >> with a line of small circles strung together. >> I tried milling with a Vortex 1230 1/4" solid carbide up spiral @ 18000rpm >> feed rate set to 100ipm (but due to machine acceleration limits the feed >> was really only 60ipm). The path was made with 3/8" circles with a female >> climb milling path strung together with a 0.05" step, milling 1/4" deep. >> It cut beautifully, for about an inch, then the flutes clogged and the bit >> promptly broke. This was a dry test cut in the Mic-6 chewing gum and I >> forgot to turn on the air blast. >> >> Suggestions on where I should go from here? Smaller step? Lower or >> higher RPM? Larger circle (to allow faster feed)? I know Getting the air >> blast turned on and a squirt of WD-40 will help, but will that be enough? >> Better Aluminum stock should also help, I have 3 sheets of 6061 for the >> next ones, but I would like to cut a few things from the Mic-6 scrap left >> over from the last one. http://mathworld.wolfram.com/Trochoid.html should get you started. Trochoidal should keep the chip load even and therefore extend tool life. I'm more likely to do a small helix in Z and then work from that hole. If my material were very thick I'd helix down then plunge mill offset slightly from the perimeter. I do steel with a .1 dia stepover with a .500 end mill and plunge at 15 ipm and that is with a wimpy mill. ;-) I've seen video of 2" Ti with LN2 thru the tool coolant and insane plunge speeds. For more sane milling just ramp down and work your way around. I hate coolant because of the mess but if one needs production then there isn't much choice. YMMV
Dave >> >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
