You guys all probably know this but I'll say it anyway.. You should start using carbide endmills. I run a tooling company here in New Zealand selling to the local machine shops. Carbide is awesome. Anyway I have a couple of Chinese suppliers I buy my stuff from and a Taiwanese supplier for higher quality stuff. Shout out if you want to find some suppliers and I'll connect you up.
On Wed, Feb 19, 2020, 5:12 PM Jon Elson <[email protected]> wrote: > On 02/18/2020 08:45 PM, John Dammeyer wrote: > > I've got Mecsoft AlibreCAM generating the tool paths for this in the > attached photo. It's Cold Rolled steel 3/16" thick. I'm using a 1/4" HSS > end mill. I'm trying to figure out, using Machinists tool box, exactly > what feeds and speeds could be used for milling the slot. > > > > I was thinking 30 SFM and with a 4 flute end mill doing 0.003" per flute > the toolbox comes out with 460RPM, 5.5ipm for S460 and F5.5 and 10% of > tool diameter for depth per pass so 0.025" > > > > Is that too conservative or likely to break something? Doing it > manually I'd do it by feel but once it's automatic it's harder to decide > SFM and chip load. > > > Those numbers sound mostly OK to me. But, I LONG AGO gave > up plain HSS, the tool life was just awful. > I learned on a box of P&W Stellite tools and got spoiled. > When I finally wore them out, I started using > M42 and M57 cutters, which have at least 3X the tool life. > I'm showing 60-80 SFPM so that would be more > like 900-1000 RPM, but coolant would be required. And, I > usually plunge about 1/2 the cutter diameter > per pass. It all depends on the stiffness of your machine > how much of a cut it can handle. > > Jon > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
