John Kasunich wrote: > Thomas Kaiser wrote: > >>> > MIN_FERROR = 10000.0 >> I add this to avoid the following error. I know I have to change after I >> could set up this machine right, but is this really needed? I don't have >> any feedback from the axis, So how can EMC2 detect a following error? >> EMC2 is only sending pulses to the axis and assumes that the axis moves >> this distance. I am wrong on this one? > > You don't have feedback from the actual motors, but you do have feedback > from the step generators. In this case, since the base period isn't > fast enough to allow the step generator to keep up with the commanded > velocity, you would get a following error. > > The solution is to lower the max velocity to something less than > 25mm/second. > > Later you can experiment with different base periods to see if you can > go faster - without some testing and math, you can't know whether the > drives or the computer are the limit. Most computers can run base > period faster than 100uS. > > If your drives really need a 40uS long step pulse, you do not want to > use "doublestep". Doublestep is a technique used to improve the maximum > step rate when using drives that need very short step pulses. > > Unfortunately for you stepconf uses doublestep by default. Most drives > work very well with doublestep, and stepconf is intended to be helpful > for "most people", at the expense of not covering some unusual cases. > > If your drives really need 40uS long pulses, you will have to adjust > your configuration manually. > > Regards, > > John Kasunich
Hello John Thanks a lot. I found a timing chart in the maintenance section of the Schaublin manual. This timing chart shows that the pules length has to be 37 us. So, I decided to go with 40 us to be on the save side. Looks like I don't need "doublestep". I will do like you suggested. lower the velocity and after the axis behave like I think its OK, I will start playing with the base period. Thanks a lot. Thomas ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
