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Hi there
I bought a Chinese servo driver XP200 30 PL. I can't setup this very well in my cnc lathe. I want (if there is) a tune up program for this servo. Any idea?
 

Hi all,
I've been running a 3 axis stepper cnc voor a couple of years now. Everything was working fine 4 days ago. Today after powering on when I try to jog or G28 I get joint following errors on all axis. If I lower the feedrate substantially I can jog manually, bur starting any job fails joint 'x' following error. I havent made any changes to hall or ini file. Can anyone point me in the right direction for troubleshooting?
Thanks in advance.

Okay, thank you. I'm fairly certain that the reason for that message is that the pendant (dongle) has reset itself. But I don't think we know why it did so in this case. It could be something that the xhc-whb04b-6 component is doing wrong (different from the mode change delay). But it could also be that the dongle firmware is just that unstable.

I don't have any real good way to troubleshoot this. For the mode change timeout, I could capture the USB signals with a logic analyzer. But that is not feasible with my equipment if I need to wait for maybe one hour for the issue to occur. Wireshark is a possibility, but it does not show the low level packets...

I have also implemented support for MDS-B-SVJ2 Servos via ethernet. That's the first test. X/Y/Z and the spindle are ok (the video only shows X/Y). I will make some other videos within the next weeks. For a test it's connected via USB ethernet adapter to my notebook (I will move it to a raspberry PI within th next days)

Still quite some way to go .. tool changer, lubrication system, chip conveyor and so on. My Meldas M65 controller had issues with the battery 3 times in a row (and we bought them original from Mitsubishi), everytime the settings are gone we would have to drive to Mitsubishi to put the options in... I'm done with that and move the system to LinuxCNC now.

I think the github issue is dead so better discuss here.

It's always the same error:github.com/LinuxCNC/linuxcnc/blob/ffc393...whb04b-6/usb.cc#L465
Don't have an actual log available, pretty sure it's that line

Yeah, at least for me the loops = 10 was not the solution to everything, so not surprised the situation is the same for you. As far as I have seen, this loops = 10 would only help during a LinuxCNC mode change (auto/manual/mdi/teleop/joint).

I was not aware of that issue, so that you for bringing that up. I will write a comment there (if I can), because I think what we have discussed here is a partial solution.

I would be interesting in knowing the error message (if any) when it fails, i.e. console ouput. This I can also "generate" myself, but right now I'm not using the machine.

Orbiter V2 is also very good and has a lot of pulling force (10KG according to spec), is very small and high quality, but not centered enough for your setup.
I have one on the big (huge) Voron i built and it went to a local school here:

Perhaps should change the subject line now, since my hardware has changed...

We have now installed a 7i97T/7i74/7i84U combo and have the machine up
and running. I would still like to use the mesa modbus component to
talk to our several modbus I/O boards and the spindle.

To enable this, I'd be grateful if you would make a firmware for this
combination:

7i97T with pktuart/modbus on the TB4's RS485 port, and a 7i74 on the
P2 expansion connector with pktuart/modbus on channel 7 and 7x SSERIAL
ports on channels 0-6

if possible?

Ethercat components are now very inexpensive to purchase. The servo kits at Stepperonline cost less than €200, including customs duties and taxes. Fieldbus modules are available at low prices on eBay.
Why Ethercat?
Step/dir: has limited frequency/encoder resolution and is only suitable for small tools. High demands on the PC.
Analog: I tried this, but unfortunately it was very disappointing.
Ethercat: Real-time capable, motion control, position feedback, extremely high speeds possible.

 

The forum decided to ban my IP because of its distorted view of the world during outages.
Thankfully, Andy rescued me back from the dead after a message to the developers mailing list!

Ihave a new component in progress that is designed to address many if the things you raise home jump, pv mode etc. be patient as i had to put it aside for a while

The mindset should be that the drive decides.
The component can only ask the drive to do things like switch op-mode, start homing, etc
for the rest the drive must react to every status condition that comes from the drive.

There are other circumstances when the position feedback can be out of sync with linuxcnc joint commanded position.
A spindle running in PV mode as a spindle motor, switching to csp mode as an axle comes to mind.
The component handles and offset in such a case.

thanks, indeed that doesnt work therfore jsut as
URL: github.com/LukasOtis/LinuxCNCEthercat
and link  link
 

It's Bridgeport Series 1 CNC milling machine.
My home switches locations are randomly placed but min/max are measured home to hard limit switch and then backed a little.

My X and Y axes home switches are cheap China proximity switches but Z axis switch are good mechanical. Thought maybe they are not accurate but DRO will show that machine have run over soft limit and next time soft limit is working.

Credit where credit is due: I built it but didn't design it, the credit goes to Mike Bax, who builds and sells the high voltage pulse generator used in his EDM machine design. Anyway, it's running and working fine; my questions are about using linuxCNC in general.

I'm having a heck of a time wrapping my head around how to properly set up a workpiece in linuxCNC so that it starts cutting at the expected point.  There are three markers in the Preview window, a large circle with crosshairs, and two smaller "X"s. I understand that the large marker is Machine Home but don't understand its usefulness in the display. The two small "X" figures move around when offsets are changed, but they don't always seem related to where the cut starts. My usual steps are:

Load an .nc job into linuxCNC, which appears in the Preview tab.

"Home All" is selected.

Bax supplies software with his power supply, including extensions to linuxCNC that provide utilities such as Edge Find. I run that, and the respective axis value changes to some value denoting the edge. So far, so good.

The first issue is that I don't know how the resulting value relates to the overall workpiece. The value changed somewhat during the Edge Find, so is offset by some amount. For this example when the cut starts right at the edge of the workpiece, I don't know if Touch Off is necessary, since the cutter is already immediately adjacent to the work piece. If a Touch Off value is required, I don't know what to enter.

The first photo shows a typical preview display with the large target and the two X's. My "guess" is that the two X's represent the start and end of the cutting path. Correct? The large target doesn't seem useful, but it's probably because I don't know what it represents.

The second photo really confused me. Here, the cut "started" at the free end of the red diagonal line, moving toward the upper left corner of the workpiece (note that this is inside the workpiece). Also note that neither of the X markers is at the start of the red line. While the red diagonal line was extending, the physical cutter was Not moving. The red line continued until it reached one of the X's and then began following the contour of the cut. The crazy thing is that the physical cutter Still wasn't moving and didn't until the red track came down even with its start. Only then did the physical cutter contact the work. As a result, the entire workpiece ended up missing everything above that point.

I'm fairly convinced that I'm not understanding and using Touch Off values correctly and am hoping that someone can explain it to me as someone would explain to a small child... Thanks.