AUTOMATIC MACHINE GAGING 



727 



FINGER CONTROL BAR "b" 

 FINGER BAR "a" 



Fig. 20 



The finger control bar B is likewise operated by a bell crank gear 

 segment and eccentric but is set with a thirty degrees lag. The effect 

 of this lag is illustrated in sketches D and E which show the manner in 

 which the feed fingers C are withdrawn on the return stroke of the 

 finger bar. 



Economic Considerations 



A comparison of hand versus machine gaging is given in Table I. 

 In this particular case the quality of the inspection work was bettered 

 approximately 100 per cent, while the cost was reduced 60 per cent. 

 While this showing is rather better than the average, the tendency in 

 most instances is in the same direction. 



Like the turret machine previously described, this one was designed 

 with the idea of making it readily adaptable for similar work on other 

 parts. The number of units and thereby the number of operations 

 on a machine may be varied greatly. A unit may be quickly removed 

 for adjustment or repair and easily replaced. If the conditions 

 warranted, spare units could be provided and an adjusted unit put 

 in the place of a defective one in fifteen or twenty minutes. 



The frame is built of welded structural steel. The machine is a 

 complete unit with individual motor drive requiring only the at- 

 tachment of the electric power supply. 



The unit system for the equipment provides a wide latitude in the 

 choice of gaging and testing fixtures to be used and the details of 

 operating them. 



