Hi Gene, I suspect the problem is a bit strange in my case.
I can run the knee at 150 ipm. The tapping in this case happens at 10 ipm. The I3 parameter means it returns at 30 IPM. I can jog up and down at say 60 IPM and never get a following error for Joint 2 which is the Z axis. Since this showed up during the G33.1 I'm going to guess that the deceleration of the Z axis compared to the spindle doesn't match what is expected. Since Z can move with G0 motion (150 ipm) without following errors the problem has something to do with the timing of the I3. I changed the value to S100 so now tapping is at 5 IPM. It does not create a following error with I6 which is 30 IP the same failure speed when it's 10 IPM and I3 for 30 IPM. That suggests again that it's not as obvious as it might appear. Note in my sample below I also move the Z to 0.5 with a G0 . That's again 150 IPM. No following error. Therefore given the above experiments the Z axis motion for tracking the S200 spindle at I3 has an issue yet doesn't at S100 and I6 which is the exact same speed. The problem is under the covers somewhere and the Joint 2 following error isn't totally accurate but is what happens later. John -----Original Message----- From: gene heskett [mailto:ghesk...@shentel.net] Sent: July 3, 2023 5:49 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] G33.1 error then g-code file parsed On 7/3/23 19:32, Nicklas SB Karlsson wrote: > Which version of Linuxcnc did you try it on? > > > Den 2023-06-28 kl. 19:52, skrev John Dammeyer: >> So this morning I whipped up a small g-code program to test the >> tapping.� I >> started a fresh LinuxCNC so that most of the parameters were default. >> Did� a HOME command and then moved to the logical home position with a >> G0 X0 >> Y0 G0 Z0. >> Then loaded this program. >> >> G17 G20 G40 G90 >> G1 X0 Y0 F20 >> G1 Z0 >> S200 M3 >> G33.1 Z-0.7 K0.05 I3.0 >> g0 Z0.5 >> M5 >> M2 >> % >> >> The program loaded without errors. >> What's interesting is that this time although the knee went back down >> at 3x >> the speed after tapping the end result was a "Joint 2 following error" >> Remove the I3.0 and the following error does not happen.� Works with I1.5 >> but not I2.0. >> I suspect it should throw a following error at I3 in any event. The docs are quite concise: "I - optional spindle speed multiplier for faster return move" And your machine is not able to follow that great a speedup. It may also be suffering from excessive backlash as that move also takes time that throws following errors quite easily for backlash comps over a thou in my experience here. YMMV of course. Since that is z motion, and heads or knees are heavy, there is effectively no backlash as long as the withdrawal speed is below gravity's acceleration AND the spindle has the speed reserve to keep up. I'd try -I1.5 as a half the 3 compromise and gradually increase/decrease it to see where the limit might be on your machine. Or not use the I option. Don't forget that 3x the spindle speed may be beyond the spindles capability. Even a slightly out of tune PID can affect how well the -I option works. I haven't used it myself, but I'd assume a -I0.5, would slow the return on a moving head machine. In case the weight of the head is almost more that the motor can lift. Some experimentation to find the limits of your machine is in order, but I believe I'd tap air, its cheaper than broken taps. ;o)> >> Not sure why that is.� It worked the other day, even from the MDI >> entry with >> I3.0.� And now it also generates the following error from the MDI. >> >> I'm going to guess either the machine is cold and a bit stiff or there >> were >> some other parameters the other day set that prevented the fault. >> In either case, I do not get a fault loading the program. >> >> John >> >> >> -----Original Message----- >> From: Nicklas SB Karlsson [mailto:n...@nksb.eu] >> Sent: June 28, 2023 6:30 AM >> To: emc-users@lists.sourceforge.net >> Subject: Re: [Emc-users] G33.1 error then g-code file parsed >> >> Have used the latest origin/master not more than a few weeks old but >> have not checked against older version. Will do this sooner or later, >> hopefully within a week. >> >> >> Den 2023-06-26 kl. 07:29, skrev John Dammeyer: >>> OK. >>> I'll try that for you. >>> I'm wondering if perhaps spindle acceleration time or some other HAL >>> parameter gets flagged with an incorrect error message.�� I've done >>> power >>> tapping from .ngc files without issue but I've not used the 'I' >>> parameter. >>> John >>> >>> -----Original Message----- >>> From: Nicklas SB Karlsson [mailto:n...@nksb.eu] >>> Sent: June 25, 2023 10:09 PM >>> To: emc-users@lists.sourceforge.net >>> Subject: Re: [Emc-users] G33.1 error then g-code file parsed >>> >>> Run from MDI then there is no error message for me either. Put the same >>> rows in a .ngc file adding M2 and bottom there is an interpreter error >>> message then loading the file and display not updated. Looking at bottom >>> the program is however actually loaded and seems to work OK. >>> >>> >>> Nicklas Karlsson >>> >>> >>> Den 2023-06-26 kl. 01:26, skrev John Dammeyer: >>>> I ran the following commands from the MDI without issue from AXIS 2.8.1 >>> with >>>> MESA 7i92H controlling an AC Servo motor (step/dir) for the spindle. >>>> G1 X0 Y0 F20 >>>> G1 Z0 >>>> S200 M3 >>>> G33.1 Z-0.7 K0.05 I3.0 >>>> M5 >>>> >>>> Interesting watching the spindle RPM indicator, and you can hear it too >> of >>>> course. >>>> Goes down to tap the 0.05" pitch (20TPI thread) at 200RPM >>>> Reverses and goes up at 600 RPM. >>>> Without the I3.0 it goes up at 200 RPM. >>>> >>>> John >>>> >>>> >>>> -----Original Message----- >>>> From: Nicklas SB Karlsson [mailto:n...@nksb.eu] >>>> Sent: June 25, 2023 9:07 AM >>>> To: emc-users@lists.sourceforge.net >>>> Subject: Re: [Emc-users] G33.1 error then g-code file parsed >>>> >>>> There is positioning move XYZ in real program but happened to remove >>>> them then I should make a small test case. >>>> >>>> Adding positioning move to test case make no difference. Linuxcnc >>>> report >>>> a file interpretation error and do not update display but program seems >>>> to work supposed to. >>>> >>>> Nicklas Karlsson >>>> >>>> >>>> Den 2023-06-23 kl. 16:20, skrev Chris Radek: >>>>> I would add positioning moves (positioning all of XYZ) before the >>>>> G33.1 because otherwise the tapped hole can be anywhere - the >>>>> program is indeterminate.� This sure might mess up any attempt by >>>>> your GUI to check the program or generate a preview. >>>>> >>>>> Chris >>>>> >>>>> On Wed, Jun 14, 2023 at 09:14:20PM +0200, Nicklas SB Karlsson wrote: >>>>>> I put the lines below into a file: >>>>>> >>>>>> ���� ?? M3 S100 >>>>>> ���� ?? G33.1 Z-30.474 K0.8 I3.000 >>>>>> ���� ?? M5 >>>>>> ���� ?? M2 >>>>>> >>>>>> Then I read into Linuxcnc I get error message: >>>>>> >>>>>> ���� ?? parse_file interp_error >>>>>> >>>>>> Removing the line with G33.1 then no error message so it is something >>>>>> with this row. Program do however execute as expected with G33.1 line >>>>>> even though there is an error message so no real problem. Also >>>>>> execute >>>>>> without an error message if run manually in MDI mode. Use >>>>>> origin/master >>>>>> last commit Mon May 8 16:10:03 2023 +0200 >>>>>> 404aa407f136ce91a3e6bf911c7bda54011a74e9 Anybody else had similar >>>> problem? >>>>>> Nicklas Karlsson >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Emc-users mailing list >>>>>> Emc-users@lists.sourceforge.net >>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>>> >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>>> >>>> >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > 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, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
