X bar and R Chart

This topic has 2 replies, 3 voices, and was last updated 15 years, 1 month ago by Akram.

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August 17, 2005 at 7:02 am #40389

BG
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Hi All,
Can I use X bar and R chart to make sure the tester produce measurement corectly for each parts that operator measured?
Your suggestion and advise are appreciated.
Thanks

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August 17, 2005 at 7:30 am #125204

Jaybee
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Hi BG,
You can use any variable control chart that is fit for purpose, however, you need to make sure the ‘testers’ can actually measure correctly, for that reason you need to conduct MSA, variable gage RnR, if unsure about how to do it / what is required, check out this website.
Use the Anova method as opposed to the Xbar & R while conducting the gage RnR, it is more accurate & considers the interaction between the part & the operator.
hope it helps.
J

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August 17, 2005 at 7:36 am #125205

Akram
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BG,
The types of control charts used to monitor quality depend on the nature of the data gathered. Monitoring the production of parts that just either good or bad is different than monitoring specific CTQ ( such as length, weight ) on a part. In other words, the type of control chart will depend on whether the data gathered are attribute, variable or multivariate.
In the example that you have given, since you are talking about measurement, you should be able to use the X-bar and R charts.
try http://www.sixsigmafirst.com/controlcharts.htm
hope this will help
Akram Al-Qiram

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