An embodiment of the present invention provides a system comprising a summing device and first amplifier portion. The carrier body has brake and movement control apparatus secured therein. The monitoring module also comprises a video capture apparatus arranged to provide video data. Of course, other combinations and claims are provided as well. , and provides a result of calculation and starting time and ending time of the chapters to a chapter selecting part. The invention is preferably applied to the fabrication of high-precision micromechanical objects, in particular in the aeronautical and clock-watch-making fields.