Inspection during Procct* 



standards will aHcct also the kind of gauges to 

 be used. Where precision work is required, it 

 should be borne in rnirul that the gauges them- 

 selves wear. They must be inspected regularly 

 and kept in perfect condition, if the standards 

 are to be maintains 



In . in A/.;. <>ps. In machine 



shops, where accurate work is done in great quan- 

 s, three sets of similar gauges are used: 



First, working gauges used by the workmen 

 during production. 



Second, ins f> fetors' gauges used by the si 

 inspectors. 



! d, master gauges used to check the other 

 gauges. 



The first and second are used continually and 

 arc, consequently, subject to wear; the master 

 gauges are kept in the tool room and used for 

 reference onlv therefore, retain their size 



for a long time. 



In such shops, inspecting may be done at various 

 stages during the progress of the work, as follows: 



a. First-piece inspection. Done by the tool- 

 <rttcr or inspector to insure the correct setting of 

 the cutting tools and fixtures before proceeding 

 with the work. 



h. 11'orkiny inspection. Done by the workman 

 himself during the progress of the run, to check 

 wear of cutting tools or changes in setting. 



c. Operation ; >n. All the pieces put 



through may be gauged by an inspector before pro- 



