On Sun, 2010-03-28 at 09:46 -0400, Gene Heskett wrote: > On Sunday 28 March 2010, Dave Caroline wrote: > >this would also be useful for worm to wheel errors in rotary talbes > > > >Dave Caroline > > > And it wouldn't absolutely require a home switch if the table is homed at > 0:0, that should be repeatable enough. > > Next Q though Dave: what sort of a device would one use to map those errors > with? In my teeny little India made hundred dollar table, you know the > errors have to be considerable. OTOH, while sharpening a table saw blade, I > would estimate the calculated tooth position and the factory tooth were > within a thou at the rim of a 10" blade, well within my ability to center > the blade on a tight fitting arbor. My biggest problem is the backlash, > which made it cut very tight sprockets. But they worked anyway. ;) > > >On Sun, Mar 28, 2010 at 10:22 AM, Chris Rhodin <ch...@notav8.com> wrote: > >> Hi, > >> > >> Is there a way to compensate for a periodic position error? I see the > >> screw compensation, but it looks like it's intended to adjust for errors > >> over the length not per revolution. > >> > >> Chris Rhodin > >> For starters I'd mount a 2500 ppr encoder axially and have at it. 360/10000 is a good start. Other than that consult "Foundations of Mechanical Accuracy", W.R. Moore. ILL (inter library loan) is good for this.
I got lucky one day and picked up a copy at Powell's. Dave > >> > >> ------------------------------------------------------------------------ > >>------ Download Intel® Parallel Studio Eval > >> Try the new software tools for yourself. Speed compiling, find bugs > >> proactively, and fine-tune applications for parallel performance. > >> See why Intel Parallel Studio got high marks during beta. > >> http://p.sf.net/sfu/intel-sw-dev > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > >-------------------------------------------------------------------------- > >---- Download Intel® Parallel Studio Eval > >Try the new software tools for yourself. Speed compiling, find bugs > >proactively, and fine-tune applications for parallel performance. > >See why Intel Parallel Studio got high marks during beta. > >http://p.sf.net/sfu/intel-sw-dev > >_______________________________________________ > >Emc-users mailing list > >Emc-users@lists.sourceforge.net > >https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
