How Does Machine Espresso Work? Machine espresso makes use of precise pressure and mind-blowing filter technology to create the perfect cup of coffee. How exactly does it work? To make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. https://www.coffeee.uk/products/de-longhi-pump-espresso-machine-1450w-1-4l-reflection-bronze