AUTOMATIC MACHINE GAGING 



721 



The gage for operation No. 6 has four | in. plungers (P, Fig. 15) 

 arranged to make contact with the insert as shown at (b), Fig. 12, and 

 the electrical contacts of the gage controlled by the plungers are 

 connected to a bank of relays so that if any three or all four of the 

 gage points are within the limits the block is passed, but if two or more 

 are outside the limits the block is rejected. This gage, shown in Figs. 

 14, 15, 16, and 17, is without pivots, the moving parts being controlled 



Fig. 13 



by thin steel reeds as shown in Fig. 14. Fig. 15 shows a partial, and 

 Fig. 16 a complete, assembly, while Fig. 17 shows the equalizing levers 

 for centering the block in the gage. Using master steel gage blocks, 

 the contact points are adjusted by the screws A, Fig. 16, to accept 

 blocks if the underflush dimension is minimum 0.0024 in. and maximum 

 0.0032 in., and reject blocks when the dimension is 0.0023 in. or less or 

 0.0033 in. or more. 



The single plunger gages used for operations 2, 3, 4, 5 and 7 are also 

 of the reed type and are similar to that shown in Fig. 18. These have 

 a sliding electrical contact instead of a point contact, the pointer A 



