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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
