Old mouse instead of encoder

I don't know in what topic to ask this, but what variable should be changed to make such thing?

I don't think you know what you want to do, and I am sure that I don't know what you want to do.

Do you understand closed-loop control and PID controllers?
en.wikipedia.org/wiki/PID_controller

I always wanted to try with a stepper system w/ encoders - hooking the Following error up to the motions adaptive feed in such a way that as the following error increased - the adaptive feed would decrease. (to a minimum velocity that the stepper could start back up)

I don't know how practical this is.

sam

such a way that as the following error increased - the adaptive feed would decrease

I want to try to tune PID for position. But I'm new in linuxCNC completely. I need to read documents for it at first.
What manual is better to read for this.

I wonder what variable is related to task and what to feedback to make nets with them.

aleksamc wrote: I wonder what variable is related to task and what to feedback to make nets with them.

linuxcnc.org/docs/2.7/html/config/integrator-concepts.html
linuxcnc.org/docs/2.7/html/man/man9/motion.9.html
linuxcnc.org/docs/2.7/html/man/man9/pid.9.html