on 06-25-2010 1:42 PM
Hi Friends,
i have a issue in SPC
I have taken sampling procedure-fixed sample.
valuation mode- SPC inspection
with free inpection point-tick
control chart type-216 shewhart chart for x-bar/samples/USA
Sample seize-5
inspection frequency-1
in MIC maintained all these-
lower limit,uper limit,target value,sampling procedure,spc characterictic,single result,fixed scope.
in QP01 -I am taking in SPC creation-60 master inspection charastestic.
after doing result recording,clicking control chart-getting graph parallel line.i tried lot. but always graph is coming paralell.i cudnt understand the result.
pls help me do to suitable setting so that i can see the graph result.
regards,
siddharth shanker
There could be several reasons why the graph is coming as a parallel line, the most common reason is not enough data points are available to plot on a graph and the control limits were not calculated.
Try to put more results for the MIC and once you call the control chart from the RR screen, click on the calculator symbol - your control limits will be calculate based on the results entered. Once the limits are calculated, you can see the values plotted on the graph.
I can see the above two as major reasons, may have some other. Get back to me if you need any additional inputs.
Ram
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One reason could be : Check the X & Y axis .Is it Time on X axis? It should be the span of values which you have entered in rge RR.If this is the case then you may have to change the dimension of the axis.
Another reason can be Change the control chat type & then check the possibilities.
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