On Thursday 26 November 2015 05:22:08 Gregg Eshelman wrote: > On 11/25/2015 6:34 AM, Todd Zuercher wrote: > > I'll second that thought. HSS often works better in solid wood, > > without much if any shorter life than carbide.
This ebony seems to be very abrasive. Dulls a file fairly quickly, and sanding the fins off 4 of these chips wipes out a strip of 320 grit sandpaper 2" wide. You can blow the dust off, usually, but the paper still has no cutting tooth left, might as well get another strip off the sheet. > Any tiny endmill will work better for milling than a carbide PCB drill > which is not designed for moving sideways. These are not drills, but true end mills. Sharper than stink too. > Crack open the wallet and spend a few on a couple of proper 1/32" end > mills. RPM as fast as you can, shallow passes. Where the drill is > puffing out dust the mill should cut chips. What do you call a shallow pass? The last one I broke was cutting half its diameter deep at the time, and I was keeping the slot cleared out with a 90 psi air hose. I think the only carbide "drills" I have are something that MSC threw in as a bonus a couple years ago with a north of a $100 order. 1/8", I never have figured out a good use for them. Everything else is a true end mill. I have 1 only, 0.0625" mill left from a 10 pack, and if and when my spindle runs again, I'll try that. It s/b about 4x stronger than the 0.03125's are. If I order some more, I'll get another 10 pack of those. My code can handle either size as I set it as part of the math. Tool comp isn't useable because the roundover needs to follow the exact same path, so effectively the code thinks all tools are the same diameter, and the backplot is the centerline of the tool. But first, I need to make the spindle run again. I suspect a heat pulse fatigue failure in the 4x20 fuse on Jons pwm servo board. The spindle was being shut down while the machine moved to the next chip position in a step & repeat loop, and never restarted for the 3rd of 4 chips to be cut from the workpiece in that run cycle. The shut down wasn't long enough to coast to a full stop, so it was restarting from about 500 revs at the time. 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
