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BELL SYSTEM TECHNICAL JOURNAL 



the punch P, and as the die ascends on the up stroke of the press the 

 blank is forced back into the stock by the action of the stripper and 



2T. + 0.135 y 



MIN. 0.I90VL 



Fig. 3 — Cross-sectional view of standard design for sub-press compound punch and 

 die illustrating principal parts. 



shedder. The material is then advanced to the next position and the 

 operation repeated. 



If no positive provision is provided in a punch and die for securing 

 fixed alignment of the cutting members, considerable care and skill 

 is required in order to adjust and set the tool in the press so as to bring 



