FLEXIBLE REPEATER MANUFACTURE 133 



(4) Special — Legibility of handwriting, ability to transcribe data 

 and to use algebraic formulae in data computations. 



Inspection Plan 



The general plan of visual and mechanical inspection consisted of: 



(1) Inspection of every operation performed — ^ and in many cases 

 partial operations — during the course of manufacture. This is of par- 

 ticular importance where the quality characteristics are hidden or inac- 

 cessible after completion of the operation. 



(2) Repeated inspection at subsequent points for omissions, damage 

 and contamination. 



(3) Rejection of product at any point where there was failure to ob- 

 tain inspection or where the results of such inspection had not been 

 recorded. 



Most of the visual inspection was performed at the operators' posi- 

 tions to reduce, to a minimum, the amount of handling that could result 

 in damage and contamination. 



Visual inspection covered three general categories: 



(1) Inspection of work after some or all operations had been com- 

 pleted, such as the machining of parts. 



(2) Inspection at those points where successive operations would co^•er 

 up the work already performed. An example of this is the hand winding 

 of toroidal inductors where each layer of wire was examined under a mi- 

 croscope for such defects as twists, cracks, and crazes in enamel insula- 

 tion, spacing and overlapping of turns, and contamination before the op- 

 erator was allowed to proceed with another layer. While being inspected, 

 the work remained in the holding fixture, which was hinged in such a man- 

 ner as to permit inspection of both top and bottom of the coil. Inductors 

 received an average of 13 and a maximum of 26 visual inspections during 

 winding. 



(3) Continuous "over-the-shoulder" inspection, where strict adher- 

 ence to a process was required or where it was impossible to determine, 

 by subseciuent inspection, whether or not specific operations had been 

 performed. In these cases, the inspector checked the setup and facilities, 

 observed to see that the manufacturing layouts were being followed, 

 that the operations were being performed satisfactorily, and that spe- 

 cifications were being met. 



ELECTRICAL TESTING 



The electrical testing, in itself, was not unusual for carrier apparatus 

 and runs the gamut from dc resistance through capacitance, inductance, 



