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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?
 

tommylight wrote:

Are you trying to run LinuxCNC in sim mode inside a VM?
 

No.

Now, what was your question?

I need a Parallels LinuxCNC VM created in Parallels on an Intel Mac.