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DJCRAI
I am not a statistical expert by any means, so I need some help. I have attached data from our process. Right now we use Measurlink for data collection and SPC. What I don't understand is why the control limits for this data are so tight.
The spec is .110" +/-.005". If you look at a histogram of this data it is slightly skewed to the left, but the mean is slightly right of the target. I am trying to get my manager to understand SPC a little better, but it is like the visually challenged leading the completely blind. He insists that the control limits are too tight. The control limits as calculated by Measurlink are LCL=.111003 & UCL=.11169 for a range of .000687. I try to explain that we need to look at the reducing any variation, yet he insists that the process is already stable. What do I do? Can someone please crunch this data and help in any way?
Thanks....
Craig H.
The spec is .110" +/-.005". If you look at a histogram of this data it is slightly skewed to the left, but the mean is slightly right of the target. I am trying to get my manager to understand SPC a little better, but it is like the visually challenged leading the completely blind. He insists that the control limits are too tight. The control limits as calculated by Measurlink are LCL=.111003 & UCL=.11169 for a range of .000687. I try to explain that we need to look at the reducing any variation, yet he insists that the process is already stable. What do I do? Can someone please crunch this data and help in any way?
Thanks....
Craig H.