S
Hi,
We have a problem with the X bar R chart for a new bushing reaming process - bushing ID measurement. While plotting the chart we can follow all rules except for one - more than 7 consecutive points below or above the mean or 5 consecutive values with zero variation. We tried all we could to some how get some variation between measurements but we are not successful in doing so. The MSA study I conducted with the gage used shows that the ndc is 10 so I dont think there is a problem with my gage either.
Is there some thing I should do about this? Please advice.
Thanks
Sebin
We have a problem with the X bar R chart for a new bushing reaming process - bushing ID measurement. While plotting the chart we can follow all rules except for one - more than 7 consecutive points below or above the mean or 5 consecutive values with zero variation. We tried all we could to some how get some variation between measurements but we are not successful in doing so. The MSA study I conducted with the gage used shows that the ndc is 10 so I dont think there is a problem with my gage either.
Is there some thing I should do about this? Please advice.
Thanks
Sebin