Patent ID: 8025106

Claim:
A method for screwing in and tightening a screw connection ( 1 ) to a predetermined tightening level ( 2 ), comprising the following steps: providing a hand-held screw driving tool ( 3 ) with a regulated drive unit ( 4 ) or control functionality or both; performing a screwing-in phase (A); after said screwing-in phase (A), performing a tightening phase (B-C-D), wherein during said tightening phase (B-C-D), a screw head rests against a bearing surface ( 6 ) of the screw connection ( 1 ); increasing a speed (N) of the screw driving tool ( 3 ) during the tightening phase (B-C-D) within an acceleration interval ( 8 ) to a starting speed ( 7 ) for the tightening phase (B-C-D), wherein a quantity corresponding to said acceleration interval is selected from the group consisting of a starting speed, a maximum speed, an instantaneous acceleration, or a limit acceleration, wherein said quantity corresponding to said acceleration interval further is actively changeable, predeterminable, controllable, regulatable, or any combination thereof, and wherein said quantity corresponding to said acceleration interval is independent of individually determined screw joint properties; decreasing the speed (N) of the screw driving tool ( 3 ) within a deceleration interval ( 9 ) before achievement or until achievement of the predetermined tightening level ( 2 ), wherein the acceleration interval ( 8 ) and the deceleration interval ( 9 ), taken together, make up a predominant portion of the tightening phase (B-C-D) with regard to a traveled rotation angle (W) of the screw connection ( 1 ), and wherein the acceleration interval ( 8 ) is shorter than the deceleration interval ( 9 ).