Makes sense.. :) On Mon, Mar 22, 2021 at 11:37 AM John Dammeyer <jo...@autoartisans.com> wrote:
> Using the math from that link below > (202-200)/200=0.01 ==> inverted is 100:1. > > Done the other way... If that's possible then > (202-200)/202 = 0.0099009900... ==> inverted is 101:1 > > John > > > -----Original Message----- > > From: Sam Sokolik [mailto:samco...@gmail.com] > > Sent: March-22-21 6:19 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive? > > > > 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 > > > > _______________________________________________ > 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
