The invention relates to a percussion tool having an internal combustion engine and a hammer mechanism that can be driven by the internal combustion engine by means of a transmission. The component may be an electrostatic chuck comprising a ceramic electrostatic puck and a metal baseplate with at least one o-ring therebetween and joined by a solder bond is described. The motor torque controller includes an open-loop control path based on predetermined torques and accelerations and a closed loop control path based on input speed error.