552 



nr.l.I. SYSTEM TECIISICAL JOURNAL 



Punch presses were formerly liable to serious damage if two blanks 

 were accidentally placed in a forming die. We have worked out a 

 design of ram which contains a "shear ring." This consists of a soft 

 metal ring so incorporated in the connecting rod of the press as to 



Tin. 4 Motor Drivi-n Milllnu Maehinu 



shear at any predetermined pressure, thus allowing the connecting 

 rod to telescoiK' instead of breaking the die or frame of the press. 

 This impnnement permits operating punch presses .safely at greater 

 speeds than are usual on this t\'pe of equipment. 



Numerous other similar impro\ements have been woiked out, 

 many of which ha\e bt'cn jjatented. 



Tools 

 The animal demand for the product is the most important factor 

 in determining tlu' kind of tool, tixluri', and gaugi' t(|uipnunt to he 

 prcnided. 



