On Thursday 28 October 2021 11:45:49 Sam Sokolik wrote: > All my machines - steppers and servos are running pid. I think > Peter forgot to mention - The reason PID is recommended is because it > handles latency spikes way better. We have seen situations where a > latency spike confuses the hell out of position mode stepgens. > (ymmv)
But thats why we run preempt-rt kernels Sam. Even on the pi, the maximum spike is 200 microseconds while FF is initializing. W/O FF, 4 to 50 u-secs. And the big lathe has never noticed that. The little mill, before it commited suicide by spitting out all the balls of the y nut, was running sw steppers, and they did notice occasionally. It also severely limited that machines rapids, to around 8 or 9" a minute. Putting a 5i25 in it and it ran about 50 ipm w/o any stutters. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
