On Sat, 14 May 2011, Kirk Wallace wrote: >> Jon > > They must use direct drive, fast screws and very stiff mechanical > structures in order to justify the high encoder resolution. On my > machines, the least significant bits would be noise. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA >
The high resolution also give you better velocity estimates, and less crunchy PID loop behavior. For example, a tightly tuned system might have a P term that applies full torque with a 1/25 of a turn error so with a 1000 line encoder (4000 counts/turn) you only get 160 counts for full scale drive or a little better that 7 bits feedback resolution, so improving this by a factor of 10 or more is a win. > > ------------------------------------------------------------------------------ > Achieve unprecedented app performance and reliability > What every C/C++ and Fortran developer should know. > Learn how Intel has extended the reach of its next-generation tools > to help boost performance applications - inlcuding clusters. > http://p.sf.net/sfu/intel-dev2devmay > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Achieve unprecedented app performance and reliability What every C/C++ and Fortran developer should know. Learn how Intel has extended the reach of its next-generation tools to help boost performance applications - inlcuding clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
