Position error with encoder

These are some magnetic linear encoders, and they are quite different, that's why I adjusted this parameter to find a good value and make sure that the measure on the CNC and in the real life are correct. For example i checked that a 10mm move on the X axis displayed on the screen is really a 10mm move.

Can you give us the make and model of the encoders? It's possible you're losing steps on them at some point.

Do you have any rapid movements in the program? One way to check is to run a program without rapids and really slow feedrate and see if the problem persists.

hi,
There are miniature encoders from POSIC with magnetic scale, I think I dialed them correctly, the encoder scale is good and i spend a lot of time checking for a mechanic issue, and now everything is good and secured.
But i keep having a following error up to .5mm during movements, this cause and issue when i'm probing a part and misalignement in general ..

Did you try checking for encoder errors?

Are the encoder interfaces single ended or differential?

I did, I checked a lot of things about the encoders and everything seems to be right about them. I'll post a screenshot of halscope to show the error.

Now i have a more precise move and it keeps a good origin, but the following error is just super important.and this cause and error when i'm probing.

I'm using the 2.8 LCNC, could this be an issue ?

Now you don't have position loss but just following error during motion?
That's more likely a tuning issue (if you don't accumulate static position errors)

Exactly, I gave up this week-end on this issue for my mental health, but i'll get to this point soon. I tried any PID tuning, tried to tune FF1, reduced speed.. i keep having a following error during motion on my axis.

Can you post a screen shot of a halscope plot of the following error?

( plotting joint following error along with joint velocity is best for diagnostics )