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BELL SYSTEM TECHNICAL JOURNAL 



of the press, three of the parts falling through the blanking openings 

 and the others through the rectangular opening after being clipped 

 off at the edge of the die. 



1st Step 

 Perforate 7 holes and 

 clip edges of stock 



2d Step 3d Step 



Perforate 2d set of Perforate 3d set of 



holes, blank out 3 nuts holes, blank out 2d 



and notch out nuts set of 3 nuts, clip off 4 



along edges of stock nuts and cut 2d notch 



along edge of stock 

 Fig. 11 — Steps in the manufacture of brass hexagon nuts by scrapless 

 punch and die method 



On this tool, accuracy, from a tool making standpoint, is necessary 

 in order to insure proper feeding of the material and an equal sided 



Fig. 12 — Punch and die for shearing, blanking, and forming solderless cord tip 



product. When the first tools were built, it was found necessary to 

 develop very accurately the distance between the perforator and 



