> 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
