goto zero problem on axis y+A launch interrupted during

[patgabatch]

goto zero, problem on axis y + A, launch interrupted during maneuver
hello, I am doing the very first settings (uc300 eth + ucbb) of my machine and a problem occurs on goto zero, namely if I perform a goto 0 on my Y axis with its slave A on a very short distance, this maneuver is performed correctly, on the other hand if the maneuver is requested on the distance from the table, the process starts for a few ten cm then stops instantly, we hear a priori the 2 motors whistling, the control desk coordinate goes to 0 as if the manipulation was finished, and the problem is that this shifts the whole to me, I lose the perpendicularity. on my other axes I have no problems. Do you have any idea about the problem? Is there a way to reduce the speed during these manipulations?
Thank you for your help
cordially

[cncdrive]

Goto zero happens with rapid feedrate, so if the velocity for that is too fast then the same issue could happen during g-code operation with G0 rapid movement codes.
So, my advice is to lower your axes velocity to values which they can handle without stalling and loosing steps.

[patgabatch]

hello and thank you, but I am new to the cnc, the software and all the rest, so where do I have to modify in order for it to be effective
cordially

[patgabatch]

and for what reason I find this problem only on the Y + A axis, the other axes are ok?

[patgabatch]

why this problem, what manages this system can it be remedied? and how ?

[cncdrive]

It happens because you set the acceleration and/or the velocity of the axis higher than what the motors can handle.

[patgabatch]

hello, on what criterion should we then play in order to improve performance and eliminate the loss of perpendicularity, acceleration or even the speed of rotation?
I imagine that these modifications are to be made in the configuration panel for the axis concerned.

[beefy]

hello, on what criterion should we then play in order to improve performance and eliminate the loss of perpendicularity, acceleration or even the speed of rotation?
I imagine that these modifications are to be made in the configuration panel for the axis concerned.

Pat,

you've just got to try lower acceleration / velocity values that do not cause the axis motor(s) to lose steps. Every machine is different, and even the axis on one machine can be different. Friction, mass, gearing, etc are not necessarily identical on all axis.

What I did on my plasma table is keep increasing the acceleration and speed on one axis and do manual rapid jogs back and forth on that axis until I got lost steps (motor stops and squeals), then back off by a reasonable safety margin for reliability. I did this on each axis. After that, in cad, I drew up a mad zig zag, circles, arcs, etc file that lasted 15 mins, with the table running at rapid speed.

Before I ran this file, I put the Z axis in a certain known position and noted the XY co-ordinates. For plasma perhaps a rigid fine point fixed to the Z-axis will do. For a milling machine it may be necessary to set up dial indicators for accuracy.
So with the Z-axis accurately positioned at a known locations, I'd then run the file and my gantry ran all over the place at rapid speed for 15 mins. After that I'd manually command the table to return to the XY co-ordinates I'd previously recorded and see if the Z axis ended up exactly where it started. If it did, I'd assume there's no lost steps and my table could handle that speed/acceleration setting.

As for where do you adjust those settings I think you need to spend some time reading the UCCNC manual. Go to the chapter:
3 .Setting up the software for the machine (Configuration)
3.1 .Axis setup

[patgabatch]

thank you for all the good explanations, i started fumbling this morning and i understand the operation a little better. As the user manual is read in English, I have to translate it into French, which sometimes has to be read across to understand. For someone uninitiated in this type of machine, it is not easy to understand the software as well as the hardware. I will follow your logic in order to try to set up correctly
cordially