16 \Ifitrridls and Their Handling 



4. Inspection for accuracy in .</::< or finish is 

 often very important. In main machined parts 

 received in an assembling industry crank shafts, 

 axles, etc. the parts must be inspected to insure 

 accuracy of machining, hardness, etc. If the part 

 is an important one and its performance vital, 

 there is usually 100 per cent inspection. If their 

 service is not vital and the parts are used in great 

 quantities with little likelihood of much variation, 

 it may be sufficient to inspect a certain percentage 

 or a certain number from each lot received. If 

 the samples so selected are all correct, it may be 

 safely assumed that the remainder of the ship- 

 ment is satisfactory. If any of the samples are 

 found to be below requirements, then a larger 

 number and even the whole lot should be tested. 

 Inspection for finish usually requires inspection of 

 each article. 



5. Where it is not a matter of exact size, fre- 

 quently inspection may be covered by examination 

 for the fitness to the purpose for which the ma- 

 terial is intended leather is examined for blem- 

 ishes, cloth for drop-threads, etc. Rejected ma- 

 terial should be reported at once to the purchasing 

 department for return to the vendor or for other 

 adjustment. 



Storeroom Inspection. The inspection of in- 

 coming material is frequently a function of the 

 storeroom and should be done before the material 

 goes into stores and before any work is done on it. 



