No, the question was quite simple. In your example of velocity-controlled drive, it gets command input once per ~1ms, thus you can't really give it any smooth curve as velocity, as there is no way to reliably smooth it between those points. You might have low-pass filter in some MESA card, you might have low-pass filter in the drive itself, and it may be any combination of them. What will be the typical (ac/de)celeration time? Is it much larger than 1ms and we could assume all the above is irrelevant?
On Wed, May 2, 2012 at 10:50 AM, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > 2012/5/1 Alexey Starikovskiy <aysta...@gmail.com>: >> It is all good looking in theory, but how do you transfer this >> information to the servo drive? > > If I understand correctly the question, then that is "mission > impossible 5" to implement jerk limitation in the feedback loop, > closed by servo drive, because AFAIK almost all of them are running > closed source firmware. > Jerk limitation is available only in feedback loop, closed by > LinuxCNC, and I think that it is sufficient - imagine the torque loop > closed in servo drive and velocity loop closed in LinuxCNC - requested > velocity from LinuxCNC will be jerk-limited, thus will have s-shape > curve instead of trapezodial. It does not matter if servo drive has > jerk limit or no, it is already there in requested velocity. > > Viesturs > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
