On 02/22/2017 10:08 PM, Todd Zuercher wrote: > Yuck, if I don't ever have to mill that crap again it will be too soon. > Started out dry and trying to mill .12 deep per pass. 1st try (1" long ramp > in) tool ramped in to full depth nicely and then promptly snapped, 400imp > @18krpm is too fast. 150imp went about 2 inches, gumming up badly. Half a > dozen bits later, having some success with a .06" cut depth @120imp and > soaking it with WD-40. > > 18000 RPM might be too fast for a 1/4" tool, but then I read this book about high speed machining where they were running 75 HP on a 1/2" end mill at 80,000 RPM, and removing 640 cu in of aluminum per minute.
But, of course, this particular aluminum may just be pure trouble. 2024 and 6061 seem to machine really well. Are you climb milling? That is really important to prevent the tool from rubbing before it breaks the surface. Climb milling is with the edge of the cutter striking the uncut surface, so the cutting edge of the tool is moving in the same direction as the material moving past. Jon ------------------------------------------------------------------------------ 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
