I'm still pondering over replacing my ELS project with a Beaglebone running MachineKit so it can run G-Code but use the keypad and display from my original ELS and duplicate the manual style of operation when needed. The LCD display might well be replaced with a larger HDMI type Cell Phone size display driven by the Beagle.
What you see in this 11 year old video is automatic tapering. But as I described in the original posting of this thread the MPG knob and jog buttons have the ELS cross slide and carriage synchronized. https://youtu.be/RRaVIBhLgF0 So that's why I want it. Whether it's a good idea or not isn't relevant. I could replace the PIC18F with a small module containing a PIC32 which has Ethernet and USB. But why reinvent a wheel when MachineKit does 90% of what I want. Thanks John > -----Original Message----- > From: Gene Heskett [mailto:[email protected]] > Sent: July-28-18 8:39 PM > To: [email protected] > Subject: Re: [Emc-users] Slaved axis > > On Saturday 28 July 2018 20:13:20 John Dammeyer wrote: > > > Quick question. For a mill to move the tool bit from Point A to Point > > B the software parsing the G Code Xn.nnnYm.mmm determines how fast to > > accelerate and move each axis so a straight line is drawn between the > > starting and new end points. Similarly, if an arc is programed the > > X,Y motion is including acceleration and deceleration to provide the > > timed step pulses to move the tool in that arc motion. > > > > So with a lathe, the Z is the carriage, X is the cross slide. Again a > > movement of Z with the idea of forming a taper means the Z and X are > > specified and the system takes care of accelerating and moving each > > axis the correct amount and speed so that a taper is cut. For each > > pass you'd move the X in for the next depth of cut and then specify a > > relative move again. Spring passes without changing the X starting > > point. > > > > What happens if you want to simulate something like my SouthBend with > > the taper attachment where turning the carriage handwheel also moves > > the cross slide along the taper. > > > > With MachineKit or LinuxCNC, the JOG keys or MPG moves the carriage. > > Can the cross slide be programmed track the taper? Is there a way to > > 'link' the jog buttons so that they track with a mathematical formula? > > One could manually turn a ball end or some sort of other parabolic > > curve for example. > > > > Thanks > > John Dammeyer > > > Not too likely for doing it by hand John. But in gcode, its a piece of > cake to do to micron accuracy, whether its a straight line from A to B > or even an arc, nurbs even if in the mood to cut a lot of air until > you've got the pattern you want. See the G5 stuff for self calculating > curves. > > About the only way, and likely NOT repeatable, to do those sorts of > curves is to find a big, long 4 way analog joystick. And figure out how > to get its output into LCNC. > > I have tried the usual usb "gamepad" like the Saitek, and have moved the > little mill with it, but when zero to full speed is a 3/16" button > motion, its simply uncontrollable. With 3 or 4" extensions on the > buttons and lots of practice, you might get used to it eventually, but > broken tooling would still be a major expense while you were teaching > your muscles to do whats pictured in your mind. > > > > > > > > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > 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> > > ---------------------------------------------------------------------------- -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
