wow - lets try that again... Must be too early 202,200 for the outside spline and the flex gear is 200. In this situation - the 200 tooth spline is stationary to the stepper. The 202 tooth outside spline is mounted to the faceplate. In this layout - the ratio apears to be 101:1
In this situation the stepper motor and the face plate spin the same direction. With the same set of outside spines swapped - the ratio is 100:1 I am sure Andy can explain it. It doesn't make sense to me. Happy with runout... https://www.youtube.com/watch?v=eLyP2YwdstQ sam On Mon, Mar 22, 2021 at 8:19 AM Sam Sokolik <samco...@gmail.com> wrote: > 202,200 for the outside spline and the flex gear is 200. In this > situation - the 202 tooth spline is stationary to the stepper. The 200 > tooth outside spline is mounted to the faceplate. In this layout - the > ratio apears to be 101:1 > > In this situation the stepper motor and the face plate spin the same > direction. > > With the same set of outside spines swapped - the ratio is 100:1 > > I am sure Andy can explain it. It doesn't make sense to me. > > Happy with runout... https://www.youtube.com/watch?v=eLyP2YwdstQ > > sam > > On Mon, Mar 22, 2021 at 12:58 AM John Dammeyer <jo...@autoartisans.com> > wrote: > >> >> >> > From: Sam Sokolik [mailto:samco...@gmail.com] >> > So..... interesting.. I just swapped the gears.. Before my ratio >> was >> > 100:1. Input scale was 1600step/rev * 100 = 160000/360 = 444.4444444 >> > input scale. >> > >> > Now I reversed the outside splines. I thought - wow - I must be losing >> > steps - but i would aways come back to zero. Finally though - maybe >> the >> > ratio was now 102:1 - no. over shot. >> > >> > so the final solution seems to be 101:1 WTH? >> > >> > sam >> >> Hi Sam, >> I found this at: >> https://www.engineeringclicks.com/harmonic-drive/ >> >> "The rate of rotation is dependent on the rotation of the input shaft and >> the difference in the number of teeth between the flex spline and the >> circular spline. The flex spline has fewer teeth than the circular spline, >> so it can rotate at a much reduced ratio and in the opposite direction than >> that of the input shaft. The reduction ration is given by: (number of flex >> spline teeth – number of circular spline teeth) / number of flex spline >> teeth. So for example, if the flex spline has 100 teeth and the circular >> spline has 105, the reduction ratio is (100 – 105) / 100 = -0.05 which >> means that the flex spline ration is -5/100 (minus indicates the opposite >> direction of spin). The difference in the number of teeth can be changed to >> accommodate different reduction ratios and thus different specialized needs >> and requirements." >> >> So how many teeth have you on the fixed verses flex gear? And did you by >> chance miscount? >> John Dammeyer >> >> >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
