So I got a max speed of 480ipm. 1909.9 steps per inch with the 10x microstep. 152789Hz is 65448nS per step. I was pretty close to that with my first base period. I've since brought the latency down to so I'll give that a try to see if it helps.
On Sun, Aug 21, 2011 at 11:51 AM, andy pugh <bodge...@gmail.com> wrote: > On 21 August 2011 17:35, Bryce Johnson <sie...@gmail.com> wrote: > > > What does the ferror do? I thought that was only used for encoders? > > In the case of a stepper machine f-error indicates that the step > generator has not been able to keep up with the required movements, ie > it hasn't been able to output as many step pulses as you have > demanded. > > One very common cause of this is having the base period set too long > for the max stepgen velocity. > ie, if you have max speed of 600ipm (10 ips), 200 steps per rev, 8x > microstepping, 6tpi screws then your peak pulse rate demand is > 10*200*8*6 = 96,000Hz, or 10,416nS per step. If the base thread period > is longer than that, eventually the number of steps output will lag > behind demand and a following error will be indicated. > > The solution is to make sure that the accel and max velocity for the > stepgens are a tad higher than for the corresponding axes, and that > the base thread rate is consistent with the max velocity demands. > > Also, make sure that your step timings are still the same as in the > working configuration, and that the reset option is selected, and the > reset function is added to a thread. > > -- > atp > "Torque wrenches are for the obedience of fools and the guidance of wise > men" > > > ------------------------------------------------------------------------------ > Get a FREE DOWNLOAD! and learn more about uberSVN rich system, > user administration capabilities and model configuration. Take > the hassle out of deploying and managing Subversion and the > tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
