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fully_defined wrote:

I understand that I cannot demand better answers; I have no control over how people respond. I have control over:

1) How I ask questions;
2) Where I ask questions.

I need to get better at both.

Its great that you acknowldge that responsibility for the receiving of a message rests with the sender!

None of us know anything about Parallels. People have succesfully installed Linuxcnc on apple hardware from an ISO but the machine no longer runs macOS

You can't run a CNC machine from a VM because it requires a real time operating system (eg runs PREEMPT_RT kernel) 
For testing and experimenting, I would install Debian 13 (aka Trixie) using a CD ISO from cdimage.debian.org/cdimage/weekly-builds/
Drilling down to AMD64 cd-iso, it looks like there is a Mac version
cdimage.debian.org/cdimage/weekly-builds/amd64/iso-cd/

Be sure you are connected to a wired internet connection before running the installer
When installing Debian, ensure you install the XFCE or mate desktop (our ISO uses XFCE)
to install Linuxcnc then all you have to do is type:
 

This time you can blame it on me as if i recall correctly, Parallels is the software running on Apple hardware and makes it possible to run other operating systems in it, in short running virtual machines.
If that is correct, then all my answers are on point, it should run any ISO without making images on other hardware, that is the whole point of it.
Then again, it is Apple, so maybe only runs ARM stuff?

Thank you for your response.
Yes, you are correct. The position feedback should function properly as long as LinuxCNC is running, so I just need to set the position to retract the head at the end of the G-code, and the initial Z position should be in the retracted state.
However, when starting the machine, the process must be done manually to ensure that the Z-axis is retracted, preventing a potential mechanical issue where the Z-axis could be extended and collide with the punches.
How can I ensure that the Z-axis is retracted before executing the G-code program?

And please mention which model of the Lichuan servo and servo drive you use.
I assume they are cia402 devices. Here is a link to the cia402 component with a minimal example how to set it up.
github.com/dbraun1981/hal-cia402

Found another one.
The slider for max velocity is working incorrect.

Video

As one can see, I test stupid high velocities, accelerations, jerk values and so on. With such experiments I am able to crash the tp. But no freezes of linuxcnc and I am able to stop the program and restart it without a problem.

Ok, sorted it out. IO error (Idiot Operator)

Not quite sure of the combo, but something to do with the TRAJ section set to inch, not mm, and the default Jog speed set to a very low value 60 meant that the axis was moving, but at such a slow rate that I did not even see it (although the computer is not right beside the Plasma table)

Seems to have all movement sorted out now. Time to get the plasma firing.

try this one.

Hi Grotius,

had some time to test. First of all. No freezes, overflows what so ever. So well done!

I found two things and I made two videos to show it:
1.) When stopping or pausing the code the DRO dont stop. this is with my 4 axis testmachine. With the 9axis sim machine this dont happen. Both machines show strange DTG values for the A axis.

Video 1

2.) Of course in the first video the max jerk limits the feed override. So I tested a insane 2000% feed override with insane max jerk and something happened. Up to 500% everything looks fine. Over 500% it stops the code. Then I have to back up to ~350% and everthing starts again. So, yeah, not a real usecase, but I found it while going crazy at testing - sorry.

Video 2

I was thinking that but If I watch X and Y or j0 and J1 Position and Position feedback pins in Hal with the following error cranked up I can see it actually home and the values stop but the physical motors just keep rolling coal so to say. It's like Linux cnc think everything is fine but the stepper modules never got the message to stop. Even looking at the Ethercat pins, lcec.0.D2.srv-cmd pin stops when home is set but motors still spinning. Also swapping Kins back out to trivkins shows the same behavior during homing. That's why I was wondering if it's something to do with the ethercat setup perhaps?

Do you get the same if you use a program rather then MDI?

So as far as I know the kinematics need to be created so I have been taking a stab at that and have something to test.

Are you sure it's not your kinematic that creates the runaway?

Hey all,

I'm working on a 5 bar parallel robot setup.  Something similar to this.   5Link Robot

I cant seem to find if that person had a repo or config they shared. So as far as I know the kinematics need to be created so I have been taking a stab at that and have something to test.  At the same time the hardware I'm testing with are the Beckhoff 7041 stepper cards.  I have two nema 17 motors connected to the 7041's and have LCNC connecting to them with no issue.   The problem I'm having is homing.   I don't have any home switches setup right now.  Because of the kinematics I cant home at 0,0  I need to home in a position that fits in allowable space.  I have the joints setup So they home immediately. Hove Search and Latch Velocities = 0 along with Home = 0 I did set the Home offset to the positions I want the joints to be considered at.  When i fire up axis and home the joints Joint zero starts running away limited to the value I set in Ferror. I'm confused if i have a hal problem with the Ethercat setup or if something else is at play as my understanding is that the joint should not cause motion and be set as home with an offset of 60.  What May I be missing?   

Not quite sure I understand. the position feedback should work whenever LinuxCNC is running
so is seems you should just set the position to retract the head at the end of the Gcode.
In addition the initial Z position should be in the retracted position.


 

This probably doesn't belong to this specific place on the internet, but I'm posting it here anyway, 'cause it's in my head and I want to get it out:

As I have said many times before to anyone willing to listen, I fail to fully grasp how forums work. In my head, the right way to present a question, problem or dilemma is to give as much backstory and context to the problem as I can, so that the people that would know the answer would also know why I am asking and can see my full logic behind the problem. Ultimately, it's because I want to learn something, more than just solving my immediate problem, hoping the answers will have as much context as my question.

But that's not the way forums work. There are basically two outcomes:

1) Someone replies to the question they think I asked, in their own way. I usually have to clarify that the response doesn't apply to my question. Then they get offended and the rest of the thread is an argument about my attitude instead of an answer to my question. Onlookers pile on for predictable reasons, I disengage, and then a year later someone answers my question.

2) Someone replies to a small part of the subtext of the question, and not the question itself. Ten pages later, I still don't have an answer. Turns out, all the experts in the forum never thought of that. Over the next three years, people DM me instead because they didn't want to be on the wrong side in public.

I understand that I cannot demand better answers; I have no control over how people respond. I have control over:

1) How I ask questions;
2) Where I ask questions.

I need to get better at both.

How to configure the 7i77 electronic board to always start with a positive output of 10 volts before home referencing?

Good afternoon everyone, please, I need help with the following situation:

Just to give an example of a stepper motor drive device, when we connect the machine is enabled or amplifier enable input, it physically stops the motor with power to the coils and only moves when there is a Step and Dir pulse, that is, the axis does not move while the machine is on.
Unfortunately, what I am controlling is not a simple stepper motor, and neither is a Step and Dir pulse used. In my case, I am analogically controlling a hydraulic cylinder in the z-axis movement with the 7i77 electronic board.

This hydraulic cylinder, when the machine's hydraulic pump is turned on, slowly descends on its own, due to the pressure and the force of gravity itself. To keep it high, it is necessary to press jog + on the Z axis, which injects positive voltage and causes the hydraulic cylinder to rise, but as the analog output returns to zero, the cylinder descends gradually, unlike a stepper motor that remains locked until further notice. In other words, you have to keep pressing the jog + button on the z axis to keep it high.

below illustration:

1 - initial situation before axis home

 

2- jog +Z situation

 

3- jog situation -Z

 

below video demonstration



This situation in the video may show that when moving the tool wheel, it will collide with the Z axis.

 

To avoid such a collision, I need the Z axis in the case of the 7i77 board output to always have a positive output of +10 volts, this before the home position and before running the g-code program, but when running the g-code program, it will have to obey the commands, when stopping the g-code, it will return to +10 volts. I accept any help or suggestion, I thank everyone who can contribute.

How to configure the 7i77 electronic board to always start with a positive output of 10 volts before home referencing?