On Sunday 08 October 2017 00:02:09 John Dammeyer wrote: > Thanks Jon, > After having used steppers for so long seeing one of the .nc sample > files move the servo in such a silky smooth motion is really sweet. I > did manage to get everything working and not only timed a 120ipm jog > but the pulley actually turned the correct distance too. > > I'm guessing the value 2.0 for MAX_LINEAR_VELOCITY is then a value in > ips which would be 120ipm. So if I want 180 I'd set it to 3. I'll > try it. The Beagle is supposed to be able to keep up easily at 50kHz. > I went for rather course resolution encoders on the servos at 250 > lines per rev so max is 1000 steps per rev. > . . . just a sec . . . > Super! Default Jog still set at 2.0 and now max linear velocity is > 3.0 which gives me 180 ipm. > 1000 pulses/rev x 3:1 pulley ratio x 5 tpi on the lead screw = 15,000 > steps per inch and so 3 ips is 45,000 Hz. > Easy for the Beagle. Nice and smooth on the motor. > > What fun! > > From a user interface perspective though, I'm wondering if all the > wizards that are in MACH3 will win me over. Even just setting up a > touch plate for tool height is trivial in MACH but seems difficult in > MachineKit (LinuxCNC too?) Yet it looks like Tormach went LinuxCNC so > perhaps like in MACH there are outside parties making the equivalent > of wizards? > > John
A temporary touch plate is a piece of pcb material with a wire soldered to the top face and connected to an interface breakout pin. Stick it down someplace with a half a drop of superglue, and when that operation is done, rip it off & hang it on a peg till the next time you need it. Wire that pin up to motion.probe-in in the hal file and a line or 8 of gcode (G38.2 usually), done. Then you don't worry about the TLO in the tool table. None of my TTS toolholders have a permanently assigned and calibrated tool in them as I'd have to buy another $300+ dollars worth of the Chinese versions to do that. I am so used to writing my own gcode that I don't normally use more than the arc calculator. I'm fairly familiar with loop and subroutine constructs, and have written 90 line programs that might take 3 days to run. The one time I looked at Mach, it would have taken me 3x as long to become "productive" using it. Of course for me, productivity isn't relative as 90% of what I do is one offs for my own use anyway. The outside parties making wizards aren't outsiders, but generally, members of this list and often authors of some of LinuxCNC itself. I only know of two other lists I am on where that is the case, most lists are users only and the lists seem to be an insulating wall between the authors and the users. Here we have some extremely talented people. And I thank them everytime I make some swarf. My $0.02. > > -----Original Message----- > > From: Jon Elson [mailto:el...@pico-systems.com] > > Sent: October-07-17 8:01 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] MachineKit on the BeagleBone Black > > > > On 10/07/2017 12:38 PM, John Dammeyer wrote: > > > Enter the MachineKit LinuxCNC port and in some ways I feel like > > > I've > > stepped > > > > back into the dark ages. Simple things like how do I see if a > > > limit > > switch > > > > is closing or not. > > > > Use Hal Configure, or HalMeter to just see one at a time. > > You can add these to the PyVCP virtual control panel while > > setting up. > > > > > There doesn't seem to be a screen with hardware > > > interface. Etc. > > > I can see in the .ini file where I can set max override but not > > > max jog speed. I'd like to be able to output max step rate and > > > verify that everything else is working. > > > > The maximum speed is in the [TRAJ] section of the .ini file, > > MAX_LINEAR_VELOCITY > > The jog speed slider cannot be set above that. > > > > > So is MachineKit just an interesting exercise for the College or > > University > > > > level? To show CNC can be done with a 1GHz 32 bit ARM? That the > > > real solution is LinuxCNC on a 1GHz PC (or faster) with an > > > external > > controller > > > > that can be set up with the Stepping Configuration program? > > > > Machinekit is almost identical at the user's level to > > LinuxCNC. That includes what you can see in > > HAL. The GUI is a bit sluggish on the ARM CPU, but it is > > tolerable. You do have a wider selection of > > motion hardware interfaces on a PC. The PRU stepping scheme > > on the Beagle Bone is nearly as good as > > external hardware step generators. > > > > Jon > > ---------------------------------------------------------------------- >------ -- > > > 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 > > Emc-users@lists.sourceforge.net > > 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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
