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i talk about this thing... and i test now 500hz up to 3khz in 5ü0hz steps.. nothing changed.. i have 3 of them.

i wonder because the arduino brings the converter to 10v.

Maybe the OPTO input circuit requires 5V?

I guess you could test this by simple supplying +3.3VDC
to the input and seeing if you get 10V out

If you need 5V drive, you could put a stiff pullup
on the PWM pin to +5V (say 330 Ohm)

I guess it could also be a scaling issue
 a PWM value >= PWM scale will result in a fullscale
(stuck high) output

i supply 12v... thats the thing.
i dont know the circuit but i think.. the 3.3v are not the reference voltage.
after the optocoupler i meassure a 5v signal of the pwm. is it possible that i need to invert it? or is it the wrong way?
direct on the output of the lm358 i meassure 9.5v at 100% pwm.
then it goes over resistor and cap to the output. down to 9.04v

but.. with the arduino same khz i get 10v....

Again, the jog enables are false so the jog counts are ignored.
The jog enables are false because they are not connected to any
source (no hal "out" pin)

note that halui.axis.x.select and halui.axis.z.select pins are hal "in"
pins so can not enable anything.

What do you do to select an axis for jogging?
This part seems to be missing

That is, these need an additional connection
from whatever selects an axis for jogging:

net axis-select-x halui.axis.x.select
net axis-select-z halui.axis.z.select

Thank you for the answers.

I think tommylight is understanding it wrong. I don't want anything synchronized. I wanted two machines running on one PC, completely independant from each other. Separate G-Codes and movements. Literally just a second LinuxCNC instance connecting to the other machine.

The most likely cause is that the PWM --> voltage converter is
not using a Rail to Rail output (RRO) OP-AMP. 

The same thing will happen if you use your LM358, it will only
swing up to ~8.5V or 9V with a 10V supply. If you want 10V from
your  converter, you would need to use say a 12V supply.