52 



ARMATURE CONSTRUCTION 



finished, and the segment is thus brought to the form shown 

 in Fig. 49. 



Ordinarily, for handling a given segment in this machine, it is 

 merely required to provide a sector with the right number of 

 notches and of suitable radius, as the slotting punches and dies 

 (which are quite simple in construction) are usually standardised 



FIG. 48. Photo of Notching Machine. Zeh & Hahnemann. 



as to shape, to allow their use on other segments. Since the 

 masses to be accelerated at each stroke of the press are small, the 

 machine can be run at good speed without endangering the 

 accuracy of the results. 



The rotary shear and the slotting machine may be used for 

 cutting and slotting full discs or rin^s of smaller diameters by 

 substituting suitable attachments. The slotting press will slot 

 segments and rings on the outside as well as on the inside, and, as 



