Hi Les, I’m not sure if that will work with the Pico USC board. If I’m not mistaken LinuxCNC treats the motors as servos and the board handles the step generation.
Matt > On Jun 29, 2021, at 7:42 AM, Les Newell <les.new...@fastmail.co.uk> wrote: > > Hi Matt, > > Use Stepconf to generate an example config. It creates a stepper config > without any PID. You can basically cut and paste from that to your hal files. > The drives themselves are doing the PID work in your setup. > > Les > > On 28/06/2021 22:31, Matthew Herd wrote: >> Hi John and Les, >> >> Thank you for the input. I wasn’t sure how to tune the drives without the >> PID. P=0 & FF1=0 will yield a commanded velocity calculated purely on the >> commanded velocity and maximum acceleration, then? If so, that’s easy >> enough and may actually be all I need. >> >> John, I am certain I’ve sized the motors correctly. From all indications >> they’re way over-powered. The machine came standard with NEMA42 steppers >> and these servos are the same frame size (110mm bolt circle diameter is a >> bolt on replacement). They do not seem to lack for torque whatsoever. I’m >> fine with turning them down as long as I get good results and high >> reliability. I’m hoping to put the machine back to work as soon as I can >> get the bugs worked out. I did some research on the critical speeds and I’m >> pretty sure I’m more than safe at anything under 400 inches per minute. I >> don’t see any need to push it even that high. I will probably turn down the >> Z axis to 150IPM as there are very few use cases where I need to go even >> that high. The quill likely won’t tolerate extreme speeds and the travel is >> only 5" so I’m able to cover that distance very quickly regardless of max >> speed. >> >> Matt > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
