John. You really really should be running carbide endmills. They can be run dry and hot for most jobs. And they are just so much nicer than hss. It's great when you don't have to think to much about if the cutter is going to overheat. And more just about what shape you want to cut.
Pm me and I'll connect you up to my endmill supplier you can just buy direct. (I sell carbide endmills all the time through my tooling company) On Thu, Jul 1, 2021, 7:35 PM John Dammeyer <[email protected]> wrote: > > From: [email protected] [mailto: > [email protected]] > > > > On 2021-07-01 02:54, John Dammeyer wrote: > > > With a bit of oil on the part the chips come off > > > smoking. > > > > A little more oil will cure or at least reduce the smoking. Flood would > > cure it completely, but more neat oil squirted on will do the trick. > > Thanks for the feedback. There is a pump etc for flood on this mill but I > don't do enough to justify filling the reservoir for the amount of milling > I do while I'm still converting to CNC. Plus no liquid shields as yet. A > rag over the keyboard keeps the chips out. > > I've started on a mist system but it's currently project #42 so it might > be a while yet. > > > How's my speed? Too fast? Too slow? Just ..... right? > > > > You could up the feed rate by 1/3, to 100mm/min (4in/min)in steel, I > > think. It all depends on how comfortable you and the mill feel. > > I started with 4 ipm but found things just shook a bit too much. So upped > the RPM on the spindle and cut the feed down a bit. Looking at what > MecSoft CAM appears to suggest is depth could be as much as half the tool > diameter but step over still at 0.25 of tool diameter. > > It's all about chip load I guess but then you have to know what type of > metal. This stuff is fairly soft I think. > > > > > The second part had a small disaster but I'll comment on that in a > > > separate posting. > > > See below > > > > So you belong to the same not_very_exclusive club as me, then... > > > > Marcus > > Yeah not exclusive. I screw up all the time. In this case, the problem > was that when I changed the Knee from Stepper to Servo I changed the > pulley. Most of it slides on the shaft but there's no key. So instead I > used the set screws to press on acrylic posts onto the square end of the > shaft. > > Why acrylic? When you are testing things and can run into end stops etc. > the shearing of plastic helps prevent further rotation. However forgot all > about them. The intention was to replace them with brass pins. > > Well while I was cutting the hex end, the plastic sheared and suddenly Z > motion stopped. Small detour to turn off the heads of 10-32 brass screws. > Insert screws, set screws and tighten. Home and go to zero. Finish > cutting hex after re-touching off Z since the plastic must have been > already causing issues and the Z0 was no longer correct. > > I don't have a broach although with the spindle locked by the Servo I > could theoretically write G-Code to use some sort of tool to broach like a > vertical shaper. Be nice to make an insert that is round on the outside, > square on the inside and the setscrews lock it in place. > > Once the spindle sensors are in place I'll switch over from PWM 0-10V to > using the StepGen. No wiring change. Just load a different BIT file into > the 7i92H. Already tested all that with the Pi4 LCNC. Theoretically then > I should be able to also position the spindle for square broaching. Or > something like Sam S. was doing with a boring tool and XY positioning. > > John > > > > _______________________________________________ > 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
