How Does Machine Espresso Work? The machine espresso makes use of precise pressure, as well as a filtering system that is awe-inspiring to create the coffee you enjoy. What exactly is it that makes it work? To make an espresso hot water is pushed under pressure through finely ground coffee. https://www.coffeee.uk/products/gaggia-ri8425-22-grangaggia-deluxe-rot-premium-coffee-machine