Impact wrench and procedure for tightning a fastener connection therewith

摘要

The powered assembly tool, especially a screwdriver or impulse torque driver, has a variable speed motor (13) with a driven impulse generator (11) delivering an impulse of Moment (M), and torque sensor (18) measuring torque (Mv). A demand value for the required torque is determined for each impulse in increasing steps up to the final fixing torque. In this way an over-tightening of the screw or bolt is avoided when inappropriate fixing conditions exist.