A machine tool having a micro-hammering function. This micro-hammering function can be achieved either by a particular configuration of the machine tool (integrated solution) or by providing an external module between the machine tool and its tool (module solution). In micro-hammering, impact movements which superimpose a pure rotary movement of the tool of the machine tool and can thus increase, for example, a drilling force of the machine tool, are generated. The external module or the machine tool has cam disks, one of which is fixed to the shaft and the other to the housing. The cam disks can be made or interact in such a way that an impact movement is generated by way of which the rotary movement of the tool of the machine tool can be superimposed. An external module for generating impact movements and to a system of machine tool and external module.

An impact wrench is provided with a battery to power the motor. The impact wrench provides improved portability since the impact wrench does not need to be connected to an electrical extension cord or a pneumatic hose. The output drive, motor, batteries and main handle may be aligned along the axial direction of the tool. The batteries may be located between the motor and the main handle.