Study of process capability for mass production by designed tolerances

This paper investigates the process capability assessment that may suit mass production model. The task is dedicated and applied to enable the evaluation of the performance for the manufacturing machines. Two types of manufacturing processes are selected namely (Rolling and cutting) in order to evaluate their performance by application of ( control charts) namely average – range charts. Two techniques are used to evaluate the actual performance of the operation by process capability calculations and statistical analysis based on histogram technique. The results show that some of machines are unable to satisfy the specification tolerances due to obsolescence and deprecation, therefore, total maintenance for these machines.