how to synchronize two servomotors

Your Y motor PIDs seem to be running open-loop, you have an FF1 term but no P-gain. You need at least some P-term to close the loop.

If these are step-dir servos in position mode you could try configuring as a plain step/dir system without PID.

hey,

I also tried higher P -values.
when I run the servomotors without an closed loop they turn off after a while. The Driver then says overcurrent. But I can run them without any withle or so.
In the halscope I also checkt the encoder -position of both servos. They were absolutely identical. The F-error were slightly different.
what i also noticed is, that when I quick change the dirction of the motors I get a following error 3.

One question I have is. How do I tune the servos? I cant connect them to my gantry while tuning, because of the issues. But tuning them without any load is also not ideal.

Did you fix the 0 P terms? (a 0 P term cannot work)
Did you use identical PID values for the two slaved axis?

Can you post your _current_ hal and ini files?

hey,
here are my actual ini an hal files.

How does the gantry behave with a P of one? How did you settle on that number?

I would suggest setting up the HAL so that the two motors share a set of PID terms from the INI file, just to make sure that the PID Gains stay identical for the two sides.

Or, there is the option (that I think I mentioned earlier) of running the drives in position mode.

hey,
my servomotors get there cmd's in step dir signals. I set my servodrive up, so he runs in position mode. But not sure if you mean that?
The P value 1 is also ok but the servo overshoots a lot. For the p values I used the halscope. But I didnt connect the gantry cause of the whistle.