It's getting creamy in Gold 2 Michael Muller (Whipped Cream)

Unfortunately we were unable to continue with the design that we had planned. The original design was to have the whipped cream bottle face down vertically and have motors pull the nozzle with string. Despite our efforts, the motors were unable to create enough force to secrete the cream. Now we are focusing our efforts on a new set up, in which the whipped cream is inside a bag and 2 motors act like hammers and pound away until the cream comes out. The program is currently being developed for the motors to work, and we are using an ultrasonic sensor for detecting when the conveyor comes by to receive the cream.