![]() ![]() At this stage of the study, it was observed that some parts were oval and out of tolerance limits, machines and processes were insufficient and production was instable. The results obtained from five X–R control charts and the data gathered from all production lines were processed and evaluated. ![]() X–R control charts have been constructed on the data obtained from this manufacturing to discover and correct assignable causes, so that the machine capability (Cp) and the process capability (Cpk) can be determined.In order to compare design tolerance on working drawings and attained tolerances on workpieces after machining five mass production lines were set up in a medium sized company. In this experimental study some statistical calculations have been made to eliminate quality problems such as undesirable tolerance limits and out of circularity of spherodial cast iron parts during machining.
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