Patent ID: 8770899

Claim:
A boring tool comprising a main tool body and a tool holder which is adjustable relative thereto, as well as a counterweight coupled to the tool holder in such a way that upon a movement of the tool holder in one direction a movement of the counterweight occurs substantially in the opposite direction, wherein both the tool holder and also the counterweight are respectively arranged at least in part in two separate bores in the main tool body, wherein the tool holder and the counterweight are connected together by way of a connecting element, wherein the boring tool comprises a screw element having two different screwthreads, where a first screwthread is connected to the connecting element and a second screwthread is connected either to the tool holder or to the counterweight and where the screwthreads are opposite so that upon rotation of the screw element the connecting element is moved in one direction, while the tool holder or the counterweight connected to the second screwthread is moved in the opposite direction, and wherein the main tool body has a clamping device, by means of which the main tool body can be elastically deformed so that the clamping force acts on both movable parts, the tool holder and the counterweight, so that both the tool holder and also the counterweight are each clamped in the bore.