Capability Analysis

This topic has 3 replies, 4 voices, and was last updated 19 years, 9 months ago by Ron.

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November 7, 2002 at 3:54 pm #30715

Ry
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How do compute Cp, if there is only one specification limit. In my exmaple, I need to be running at least 50 minutes every hour, so my lsl is 50. Do I use 60 as a usl? or is there some other calculation method?
Thanks, Ry

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November 7, 2002 at 4:08 pm #80393

Withheld
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Consider CpL. (average-LSL)/3s

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November 14, 2002 at 3:57 am #80636

rams
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Some references state that for one-sided spec, Cp=Cpk. Some references state it does not exist. I prefer the second since Cp measures how potentially you are capable of meeting requirements, and requirements refer to your specification range (only applies to 2 sided spec).
rams

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November 14, 2002 at 12:37 pm #80654

Ron
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The most common method is to simply use the USL or the LSL whichever is applicable.

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