PRECISION TOOL MAKING 



389 



Making Punch and Die Sections 



Various methods may be used in the making of punch and die 

 sections depending on the character of the work, accuracy required, etc. 

 The use of templates and the vernier height gage in laying out work 

 centers and outlines, the application of the master plate method, the 

 use of micrometer heads and verniers on milling machines and various 

 systems of end and distance gages are all found of value in this work. 

 A brief description of several of the operations performed in making 



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Fig. 15 — Layout of die openings for solderless cord tip punch and die 



the punch and die sections for the solderless cord tip punch and die 

 previously described, will serve to illustrate the common practices 

 followed in producing high grade work. 



The first operation is the making of a tool steel master plate having 

 all the datum or reference holes necessary for accurately locating the 

 holes and contours of the openings in the die. The blank plate, 

 after being squared and the sides finished parallel to each other, is 

 mounted on the vernier milling machine shown in Fig. 14. This 

 machine is equipped with magnifying lenses over the positioning vernier 

 scales for adjusting the position of the table. The vernier scales read 

 to .001 in. and by interpolation it is possible for an operator to adjust 

 the table to within a few ten-thousandths of an inch. From the layout 



