On our system we have a ball screw (Z) axis and a linear encoder that acts as our v-axis. There is not an actual motor connected to v just an encoder. In our application we drive the z axis down until we get 5mm compression upward on the v-axis. From this point we slave the z-axis to v-axis and run our motion in x and y. On a three dimensional surface the z will move up and down to keep the 5mm compression on the v-axis. We are using the electronic gearing to accomplish this.
Our z-axis is tuned well by itself but noisy when following. I have found that if I make adjustments to the gains on the v axis this effects the following axis. So, what would be the appropriate setting for the v-axis since there is not a real motor to be tuned? Currently, the v-axis only has proportional gain and integral gain set very low - 200. One more note, there is 256:125 gear relationship between z and v. I have updated these in Ixx07 and Ixx08 for the z-axis.
