Microstep is set to 4000, gearing is 21:1 and it has very very small backlash and its well above my accuracy needs. The thing is that at very low speeds (ie 50deg/min on motor side) it loses so many steps that the error is more then few degrees after "reaching" final position...
> Make sure you dont power down, stay at full power, you did not mention > microsteps, Are you expecting higher resolution and accuracy than is > possible with a stepper. > You can see regular accuracy error due to the stepper when I tested a > linear axis > http://www.archivist.info/cnc/screw_error/ > > I also have seen some terrible rotary tables and some good ones, there > is a basic error at worm and gear rate which will/should be better at > higher reduction ratios, all the low reduction I have measured were > bad (up to .7 degree error and worm wheel rate) they were all below > 60:1 the 72:1 I tested was within specification and used for some gear > cutting masters I made. The Vertex 90:1 I use seems ok not done the > full test I did on the 72:1. > Method was angle dekkor and precision polygon. > > Dave Caroline ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
