On Wednesday 22 September 2021 19:52:57 Leonardo Marsaglia wrote: > > Not totally laid up, yet. But I'll be 87 very shortly, and the yard > > work I was doing for about 3 hrs earlier will still be yelling at me > > tomorrow. Getting old is not for the faint hearted, specially when > > your ticker is running on a battery and already has rebuilt valves > > just to keep it pumping at 30%. For me, thats good, and sure beats > > the alternative. > > I hope I could be at least half active as your age as you are. Glad to > know you're busy! > > Besides, he is not ready for me yet, I'm too much of a maverik. ;o) > > > Gabriel would send me down, I'd fix the stoker, install electricity > > and airconditioning, start a brewery and open a bar... > > I started to get thirsty when you mentioned the brewery LOL. > > El mar, 21 sept 2021 a las 18:24, Gene Heskett > (<[email protected]>) > > escribió: > > On Tuesday 21 September 2021 16:53:44 Leonardo Marsaglia wrote: > > > > There may be a miss-understanding of its purpose,or I'm useing > > > > it off its purpose. > > > > > > > > I am feeding lincurve with the absolute z position as delivered > > > > to the motion input from the stepgen. So it knows where on the > > > > bed it is. That allowed me to setup a laser, useing a knife edge > > > > in the tool holder,and measure the bed wear error, program that > > > > into the lincurve module, who output is then applied to the > > > > offset to correct this error in the x axis as it moves in the z > > > > plain. So I can turn within a thou over 3 feet of z motion that > > > > has 13 thou of bed wear right in front of the chuck. > > > > > > > > Thats how I use it, but the offset module doesn't care where > > > > this offset signal comes from, so don't be afraid to let your > > > > imagination out to play with only a common sense chaperon. ;o) > > > > > > Hello Gene! > > > > > > Well, from what I understand your application is similar to what a > > > torch height control would do. That would have no problem because > > > you're moving short distances in (I guess) a not so high speed.
One microstep at a time, maybe 200 back and forth over 48" of z travel. > > > But, I don't know if you tried the sim configs of external > > > offsets. There's one in particular that lets you modify the signal > > > fed into the eoffset and also the speed and acceleration of that > > > particular simulated joint. To sum up, you clearly see how the > > > phase shifts whenever you increase the amplitude of the signal or > > > decrease the speed/acceleration of the sim joint. I'm just > > > thinking how to avoid that phase shifting because all the parts I > > > need to machine have a register on them, so it would be nice to > > > mantain that angle in phase no matter what the RPMs on the spindle > > > are. I think that to attenuate the signal is more than enough to > > > compensate for an out of range speed/accel and avoid problems. Well since the pi3 is a bit short of power to do that, I set up a slower thread at 200hz to do all the lower priority stuff, like servicing the jog dials that substitute for the hand cranks that aren't there anymore when I want to run it like a normal lathe. Its worked so well I have had no urge to remove it once a pi4 was doing it. My one still major squawk is that none of that stuff updates the active axis radio buttons so I wind up doing touch offs to the wrong axis. I'm gradually training myself to manually do the buttons first before clicking on a touch off but its still damned frustrating. There ought to be a way to make that automatic in hal. > > > I was thinking about doing an active phase compensation in HAL to > > > compensate for the signal lag whenever the rpms change, but I > > > suspect there's a more practical solution... Perhaps theres a usable clue in the math that Sam has used to carve multi-faceted holes? That stuff is genuinely thinking outside the box. With the backgear engaged and my new much faster 3 phase stepper servo's, non-round shapes can be done on that lathe. Interesting idea to explore for sure. > > > Glad to hear you're doing well Gene :) > > > > Not totally laid up, yet. But I'll be 87 very shortly, and the yard > > work I was doing for about 3 hrs earlier will still be yelling at me > > tomorrow. Getting old is not for the faint hearted, specially when > > your ticker is running on a battery and already has rebuilt valves > > just to keep it pumping at 30%. For me, thats good, and sure beats > > the alternative. > > > > Besides, he is not ready for me yet, I'm too much of a maverik. ;o) > > > > Gabriel would send me down, I'd fix the stoker, install electricity > > and airconditioning, start a brewery and open a bar... > > > > 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-developers mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers 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-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
