On Sunday 21 April 2019 03:40:08 andy pugh wrote: > On Sun, 21 Apr 2019 at 03:34, John Dammeyer <[email protected]> wrote: > > I used the Machinist toolbox to figure out what sort of speed and > > feed I needed but ended up running the mill faster (thought I'd read > > it should be 3000 but it was supposed to be 2000). Typo error. OK. > > So tool bit 0.09375. Two flutes. HSS. Chip load 0.00551. Aluminium > > bar. SFM set at 40 which called for 2000 RPM and about 22 ipm > > That sounds slow at the spindle, I have been running at 8500 rpm and a > 2.5mm cutter in tool steel. > > FSWizard on my phone is suggesting 589 fpm (180 m/min) surface speed, > 24,000 rpm and 15 in/min (388mm/min) for your <2.5mm cutter. > (So 10x the spindle speed but lower feedrate) > > I suspect that Gene has the opposite problem, I am suspecting his feed > rate was too low if the swarf comes off as dust. (but he didn't > specify feed rate)
It was in retrospect too slow for the revs once I had some mist flowing, 5 ipm to a max of 10 I think. Where can I get a copy of this machinist toolbox. Sounds handy. The handbook covers this too, but in hard to find format since theres around 2k pages of it. 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> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
