An electric hand-held tool comprising a separator for removing dust particles from cooling air, wherein - the tool comprises a tri-part housing , having a drive electromotor with a fan located in a part , a reducer part and on the other side a main handle with entry slots for suction of cooling air, characterized in that - the separator is shaped as a cylinder or preferably as a truncated hollow cone with a bottom ring and an upper ring with a surface , preferably cone shaped, having a hub : - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool , so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft ; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface , from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle , - that due to such construction larger particles in the cooling air bounce out of the handle , which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator . - the tool comprises a tri-part housing , having a drive electromotor with a fan located in a part , a reducer part and on the other side a main handle with entry slots for suction of cooling air, characterized in that - the separator is shaped as a cylinder or preferably as a truncated hollow cone with a bottom ring and an upper ring with a surface , preferably cone shaped, having a hub : - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool , so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft ; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface , from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle , - that due to such construction larger particles in the cooling air bounce out of the handle , which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator . - the separator is through the hub mounted on a shaft of the drive electromotor between a bearing and the handle of the tool , so that rigid connection with the shaft is enabled and the separator can rotate together with the shaft ; - the separator has on the circumference of the ring and ring along the entire length of entry openings one or more, preferably nine uniformly distributed ribs rotated for an angle α with regards to the transverse axis of the cone; - each rib has an approximately rectangular cross-section and has in radial direction a relatively narrow surface , from which larger dust particles bounce off due to circumferential speed of the separator through entry slots of the handle , - that due to such construction larger particles in the cooling air bounce out of the handle , which results in removal of larger dust particles before they enter into the electric hand-held tool, while the remaining cooling air passes through openings of the separator . <EOS>