Thanks for the responses.
To help clear things up we are using a linear actuator to essentially push the bottom package from a stack of packages into another section of the vending machine. After the package is dispensed, the actuator retracts to its original position.
liudr, that was our intention to essentially to send the power signal sent from the VMC to an Arduino and then operate the actuators through the arduino. We just had the issue with the homing signal(the position feedback associated with the screw motor) sent from the VMC. I'm currently checking if the homing function can just ignored or overridden through the VMC interface. If it can not be ignored, then we will figure it out with an oscilloscope. Thanks for the suggestion.
The selection of the linear actuators was just based on the force and speed it offered, we didn't anticipate the homing issue originally.
Here's a link for it:http://progressiveautomations.com/tubular-high-speed-linear-actuator-tubular-high-speed-linear-actuator-stroke-size-force-lbs-speed-551sec-p-127.html