On Wed, Sep 22, 2021 at 8:49 AM John Figie <zephyr9...@gmail.com> wrote:
> Gene, > > I would like to better understand your problem and have been thinking about > this. I have some questions. > > > > > > > > I don't think the fact that there is a worm gear matters. The > problem, I > > > bet is the large inertia of the system. > > > Hmm I am not sure about the inertia. I think if you have a large gear > reduction then the inertia reflected across the gears should appear low > from the motors point of view. > An ideal gear reduction is a torque multipliers lets say a 4:1 system. But X/4 is still large if X is large and small if X is small. THe mass in the system still maters. > > > > > So you have a 2 worm gear reduction. Where in this system is the encoder > mounted? What are the encoder counts per rev of the encoder? > What are the motor characteristics? > I also suspect this is the root of the problem. It might be misdesigned. That said, while I know how to calculate forces in a perfect system (like a belt reduction) I'm stumped when it comes to worm gears because they are asymetric in that they can not be back driven due to friction. I don't know how to calculate the load on the motor when the motor is opposing ditection of movment. There might be (?) large frictional loads. We also don't know how the driver electronics works. > > Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
