John, Do you have flood coolant or mist coolant?
I would be inclined to try the cut full depth if you have flood or mist coolant. 1/4 inch is on the borderline of having the strength necessary to make a full depth cut. I would think 5.5ipm might be a little aggressive but I would leave it programmed at that feed and speed and turn the feedrate to about 20% to start the cut. After you get into the cut I would move the feedrate up about 10% to see, hear and feel how mill is cutting. I would keep moving the feed up until I saw, heard or felt the mill working too hard. I would then start turning the speed up a little at a time to see how the mill responds. I think 30sfm might be a little slow but you can adjust the speed after entering the cut. If you can adjust the feed and speed to make the full cut sound good and you have another part to run I would change your program to enter the cut as you did the first time but the add lines to make it more aggressive after you have entered the cut. If you are leaving a little material to clean up the you can drastically increase the speed and feed after you turn around at the end of the slot. Is the slot you are cutting wide enough to allow at least .010 thou. for a finish pass and maybe a spring pass. I would make the finish pass and spring pass in a conventional cut rather than a climb cut. Stuart On Tue, Feb 18, 2020 at 8:47 PM John Dammeyer <jo...@autoartisans.com> 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. > > > > Thanks > John > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
