Let us go back now to the service call at the steel plant. The task here was to align a roller drive connected by a cardan shaft with a Z arrangement. At this plant, the importance of aligning cardan shafts had long been recognized and alignment was already being performed using laser-optical equipment. Until now, however, it had only been possible to do so with the cardan shaft deinstalled.
To position the sensors opposite each other, the parallel offset between the shafts was bridged by mounting a cardan shaft bracket on the shaft flange on one side. Figure 3 shows the assembly on the left roller shaft.
The laser is mounted on a rotating device, and the detector is attached to the motor shaft. The deflection angles are measured with the machines uncoupled and the cardan shaft removed.
This is a time-consuming process as the cardan shaft first needs to be disassembled and the cardan shaft bracket must be carefully installed to ensure that it rests flatly against the shaft of the roller.