Regarding the servo-driven motion Stan Johnson Schneider Packagings vice president of engineering says this combination of horizontal and vertical motions especially at high speeds can be very damaging to the systems timing belt. We needed to position a coupling between the case packer servo motor and the speed reducer/timing belt that would provide the horizontal linear motion and compensate for backlash and any offset between motor and speed reducer. We considered bellows-type couplings but ruled them out as they were too mushy for this application. We needed torsional rigidity in our design connection to eliminate any possibility of backlash that could affect the servo control. Even a little play such as an extra ½ degree rotation in a rotary system he adds translates to a lot of motion in a linear system. Thus the Zero-Max coupling provides the accurate motion transfer required.