On Thursday 01 July 2021 03:31:56 John Dammeyer 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.
I've found its extremely useful, so I'd move it up the list to considerably higher than 42. This "mist" can be quite dry and still do a great job without making a big mess. It shines particularly well when doing alu that gets gummy when it even thinks about more than room temps, I cut out 2 wrenches for the er collet of my 6040, out of cheap 1/2" alu, mist on and 11 to 14k revs, and used half an 8oz coke bottle of well diluted koolmist for both wrenches. About 10 psi of air, and a $7 peristaltic liquid pump that gets power for 4ms or so, about 2x a second. Just about enough pump to spit out a drop at a power bump. All written into my .hal files and adjustable from axis with the mouse during operation. > > 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 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
