ASSEMBLING THE ARMATURE CORE 



89 



When assembling the punching?, care should be taken that 

 they are all laid with their burred side in the same direction, i.e. 

 either uppermost or vice versd. The reason for this is, obviously, 

 to correct for any imperfections in the punches and dies; for if 



FIG. 97. Complete Assembled Core of 10 pole 400 k.\v. 100 r.p.m. Generator. 

 Dick, Kerr & Co. 



the discs are always laid with their burred side uppermost, the 

 key-way will ensure that any discrepancies in the dies will be 

 superposed. Oases have been noted where supposed unsatis- 

 factory laminations have been found to be excellent when this 

 precaution was observed in assembling. For the purpose of 

 ensuring the assembling of the discs with the same side upper- 

 most, just as they were punched, it is sometimes the practice to 



