Document Actions
The screwing process
 Fig. 1 | The WITOL® is pre-assembled on one of the two structural members (Fig. 1). The style that the fixing takes ha no influence on the primary function. In the diagram, the WITOL® is connected with structural member 1 with the aid of the locking ring via snap hooks. |
 Fig. 2 | The WITOL® can then be transferred with the module to the next manufacturing step (Fig. 2). |
 Fig. 3 | The structural members to be connected to one another are fixed to one another in the desired position (Fig. 3). At the same time, a distance Δ which is not exactly known is formed between the compensatory element and structural member 2. |
 Fig. 4 | The screw is pressed through structural member 2 into the WITOL® (Fig. 4). At the same time, the screw is connected in a non-positive lock with the compensatory element with the aid of the spring element. Now, a defined torque (clamping torque) can be transferred in both turning direction. |
 Fig. 5 | The rotation of the screw is now led via the left hand drive of the compensatory element in order to rotate it out in a spinning motion (see Fig. 5). As soon as the compensation element touches structural member 2 i.e. Δ=0 normal force is established which acts in the direction of the structural member 2. This results in supporting friction on the head of the compensation element. |
 Fig. 6 | If generated friction on the thread and on the support reaches the maximum torque (clamping force), the boundary force coupling is released between the spring element and the screw. The compensatory process is thus complete (Fig. 6). |
 Fig. 7 | The screw is fixed with the corresponding starting torque. The WITOL® now acts as an additional pre-tensed structural member, similar to a spacing sleeve. The result is a pre-tensed and at the same time, a tension-free screw connection of structural members 1 and 2 which satisfies the screw connection’s safety requirements (Fig. 7). |
