On Mon, 10 Feb 2020 at 10:30, andrew beck <[email protected]> wrote: > On the back burner though I want to "close the loop" back into linuxcnc with a 7i84 mesa card I think. Has anyone done that before with a step direction control system?
What do you anticipate gaining from bringing the encoders back to LinuxCNC? If this is a stepper system (it's not clear without inbox-mining) then a PID will naturally attempt to run the motors faster, with the reverse of the hoped-for result. It is probably possible to simultaneously reduce the feed rate with adaptve feed and then attempt to recover the lost steps, but I don't know if anyone has tried that. If it is a step-servo system then the drives will already be doing all that they can. You won't gain much from bringing the motor encoder data in to LinuxCNC. However, you might be able to gain accuracy by adding linear scales to the system, and using the feedback from them to modify the motor position commands. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
