On Sat, 2011-05-14 at 08:34 -0700, Kirk Wallace wrote: > On Fri, 2011-05-13 at 20:23 -0500, Jon Elson wrote: > > Kirk Wallace wrote: > > > Is replacing the encoder with a more EMC2 friendly encoder an option? I > > > have a couple motors with proprietary encoders on them that I plan on > > > replacing with quadrature and Hall encoders or magnetic encoders such as > > > the AEAT-6010 if it's fast enough. Removing the old encoders was easy > > > enough and provides the mounting features for the new encoders. I > > > haven't gone beyond a rough plan so far, so this may not work. On the > > > other hand, if the price on Fanuc motors has gone up, it may be cheaper > > > to use generic motors with EMC2 instead and use the Fanuc motors on > > > Fanuc systems. > > > > > Oh, well, sure! You can always use the new AMT 6-channel encoder that > > has commutation outputs along with > > quadrature. BUT, the Fanuc serial encoders have 32K, 64K and 1 million > > counts/rev, and that kind of resolution > > is VERY expensive. These high-res encoders are probably more valuable > > than the motors! > > > > I was thinking about this mostly for retrofits of machines which already > > had these motor/encoders mounted > > on the machine. There are quite a few of them out there. Some are the > > older S series which I already have converters > > for. They moved on to these serial encoders sometime in the mid 90's. > > > > 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.
That kind of resolution makes for nice velocity control at low speeds where otherwise we end up with 0, 1 or 2 counts per a servo cycle. Dave > ------------------------------------------------------------------------------ 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
