Hi henrik ,
U are not alone, though I tried to get the O parameters tested at different speeds today, I sort of was confused.
here is my story.
today after setting up the delay switch i set of putting together both the X and Y to their paces and here is what I discover, at around 4000mm/sec and 45KHz there were around 8 O's and then as I wnet on reducing the speed I had to settele down of 3200mm/sec. thats real bad. Also considering the fact that the place where i have my workshop located has a night time voltage of 195 to 200 volts on each phase I had to derate my speeds to 3200mm/min and then there were no O values anymore.
thats what I could make out today. If it is a possibility for increased speed and reliability with smooth stepper then I would in all case go for it sooner or later!
let me know if you want me to do more tests and let me know how bcos I also don't have a oscilloscope.
Thats it from me today.