there is always slipstick around the 0 point. But on a reasonable slow system that does not seem to cause problems.
jan. On Sat, May 21, 2011 at 3:53 AM, gene heskett <ghesk...@wdtv.com> wrote: > On Friday, May 20, 2011 09:46:59 PM Dave did opine: > > > Does anyone have any experience in controlling servo grade hydraulic > > proportional valves with EMC2 for use in controlling a number of > > hydraulic cylinders? > > > > Does anyone know of a way to interface an SSI encoder into EMC2? > > > > I need to retrofit a large hydraulically controlled machine and the > > control has to support Gcode and be flexible. > > > > Regards, > > > > Dave > > > Looks like Berkely Process Control has some papers on that which discuss > the non-linearities of the spool valve being controlled as well as the > diffs in the slave cylinder because the rod reduces the piston area on one > side of the slave. > > Being aware of the non-linearities in those valves, the servo feedback will > be complicated, but it does seem to be do-able. > > Has anyone managed to design a 5 port spool valve that truly has linear > control? > > -- > Cheers, Gene > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > <http://tinyurl.com/ddg5bz> > <http://www.cantrip.org/gatto.html> > The poetry of heroism appeals irresitably to those who don't go to a war, > and even more so to those whom the war is making enormously wealthy." > -- Celine > > > ------------------------------------------------------------------------------ > What Every C/C++ and Fortran developer Should Know! > Read this article and learn how Intel has extended the reach of its > next-generation tools to help Windows* and Linux* C/C++ and Fortran > developers boost performance applications - including clusters. > http://p.sf.net/sfu/intel-dev2devmay > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ What Every C/C++ and Fortran developer Should Know! Read this article and learn how Intel has extended the reach of its next-generation tools to help Windows* and Linux* C/C++ and Fortran developers boost performance applications - including clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
