The Graef CM80 coffee grinder is used in combination with a semi-automatic espresso machine, otherwise known as a piston-driven machine. If you place the filter carrier in the holder and push it against the machine, the coffee grinder will automatically start grinding. Once you think you've got enough coffee, remove the filter carrier to stop the grinder from grinding. Thanks to the conic grinder and the slowly rotating motor, the coffee beans won't lose flavor and the motor won't overheat, so you can use it continuously for a long time. With 40 settings, you can set the grind size very precisely, so you can experiment like a real barista and make an espresso exactly to your taste.