Abstract: The grinding device for grinding coffee beans comprises an interface for the user for selecting the quantity of ground coffee in a range of values of selectable quantities of ground coffee, an electric motor supplied by mains electricity voltage for driving the grinders, means for measuring the mains electricity voltage and an electronic controller configured to: associate, for each value of a selectable quantity of ground coffee, a series of grinding time values with a series of corresponding values of the mains electricity voltage; acquire a value of a quantity of ground coffee selected by the user via the interface; detect by the measuring means a value of the mains electricity voltage; for the acquired value of a quantity of ground coffee selected by the user, set the grinding time value corresponding to the detected mainly electricity voltage value; and drive the grinders for the set grinding time value.

Abstract: A coffee grinding apparatus comprising a coffee grinder, a removable filter holder and a cradle positioned below the coffee grinder, the cradle has above the filter holder a support shelf delimiting an opening passing the ground coffee, below the cradle an actuator actuates an activation switch of the coffee grinder, where a removable accessory contains the dispersion of ground coffee flowing towards a filter of the removable filter holder, the removable accessory formed by a sleeve connecting the opening in the support shelf to the upper mouth of a cup of the filter holder, the sleeve having a lower release and quick couple to the upper mouth of the cup and a removable upper engagement with the support shelf, the removable upper engagement comprising a perimeter flange of the sleeve resting on the support shelf, the sleeve being configured and arranged to interact with the actuator below the perimeter flange.