Adaptive transmission mechanism

A method to control a core drill including a motor as a drive for the core drill;

• a controller;
• a transmission having at least a first gear, a second gear and a no-load state;
• a core bit;
• a first sensor to detect a rotational speed of at least one component of the transmission;
• and a second sensor to detect a motor rotational speed of the motor, the method comprising the following steps:
• ascertaining a first rotational speed of the at least one component of the transmission when the transmission has been put into the first gear;
• ascertaining a first rotational speed of the motor when the transmission has been put into the first gear,
• ascertaining a selection of the first gear on the basis of a first prescribed ratio of the first rotational speed of the at least one component of the transmission and of the first rotational speed of the motor on the basis of a look-up table;
• selecting the no-load state of the transmission;
• ascertaining the selected no-load state on the basis of a second prescribed ratio of a second rotational speed of the at least one component of the transmission and of a second rotational speed of the motor on the basis of the look-up table;
• adapting the motor rotational speed of the motor to a second gear on the basis of a third prescribed ratio of a third rotational speed of the at least one component of the transmission and of a third rotational speed of the motor on the basis of the look-up table;
• and
• selecting a second gear.