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Statistical process control is applied after a processhas been stabilized so that any deviation from the
stability can be handled easily.
There are four types of attribute charts used for non
measurable defect and defective controlling
N and NP Charts for the control of number of
defectives or non- conforming C and U Charts for the control of the defects or non-
conformities
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Used at places where various defectscould occur in a single product that is
being manufactured
The sample size of inspection is fixed
for this chart.
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Standard Deviation is given by (np (p-1))
Upper Control Limit
np + 3(np (p-1))
Lower Control Limit
np - 3(np (p-1))
Where
p = fraction of defectives
n = sample size
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Used at places where various defectscould occur in a single product that is
being manufactured
The sample size of inspection is variable
for this chart.The proportion of defectives are plotted
and analyzed for improvement of the
rocess
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IMPLEMENTATION CHART
http://j/FOR%20PRINT/C%20CHART%20IMPLEMENTATION%2030.6.10.xlshttp://j/FOR%20PRINT/C%20CHART%20IMPLEMENTATION%2030.6.10.xls