Abstract: A method is provided for controlling a power tool (1) when a material (W) is being worked, including the steps: the rotational speed of a drive (20) of the power tool is set to a first value; a first temperature value is measured; the first temperature value is compared to a pre-specified threshold value; the rotational speed of the drive (20) is reduced from the first value to a second value if the first temperature value exceeds the pre-specified threshold value for a pre-specified first period of time; a second temperature value is measured; the second temperature value is compared to the pre-specified threshold value; and the rotational speed of the drive (20) is raised from the second value to the first value if the second temperature value has fallen below the pre-specified threshold value for a pre-specified second period of time.

Abstract: A process for controlling and a core drilling machine (1) having an electrical motor (2) for rotational drive of a core drill bit (3) having cutting edges (5) oriented axial to a work piece (4), a feeding means (6) for generating the feed of the core drill bit (3) against the work piece (4) and having a controller (7) for controlling, relative to a first one-to-one control parameter, detected by a sensor (8, 8?) for electrical power consumption (P) or torque (M). A force sensor (9, 9?) is connected to the controller (7) for detecting the contact pressing force (FN) of the core drill bit (3) as the second control parameter.

Abstract: A process for controlling and a core drilling machine (1) having an electrical motor (2) for rotational drive of a core drill bit (3) having cutting edges (5) oriented axial to a work piece (4), a feeding means (6) for generating the feed of the core drill bit (3) against the work piece (4) and having a controller (7) for controlling, relative to a first one-to-one control parameter, detected by a sensor (8, 8′) for electrical power consumption (P) or torque (M). A force sensor (9, 9′) is connected to the controller (7) for detecting the contact pressing force (FN) of the core drill bit (3) as the second control parameter.