Fig. 6

Drill gear shaft and drill bits. A Lateral view of the drill gear shaft within which the drill bits are fixed and B cross section of the drive shaft with a mounted drill bit and the affixed smaller 15 teeth gear wheel. C Dimensions of the drill bits and the mill-cut contact surfaces for the maggot screws. “A ” designates the sectional plane of the cross section. 12h6 represents tolerance levels the components. h6/P7 provides the details of the pressfit and tolerance levels of its components and their interference. All measurements are in millimeters