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Re: SPC vs. 100% Inspection - Is SPC still value-added when 100% inspection is in pla
To say that assignable caues can escape detection in x-r chart is not correct.If such a thing is a possibility in any process you have to increase the frequency of sampling and even you can increase the sample size.100% INSPECTION IS NO SOLUTION IN A MASS PRODUCTION SITUATION.
V.J.Brahmaiah
Don't forget, you have special causes that can happen between sampling - and sampling may not catch it if it is intermittent. SPC is sampling - and has its limitations. So, even though your process is in control...100% inspection may be needed for certified output.
Doesn't say I like it...just a warning.
Also, you may need 100% inspection if you are using the wrong SPC - like X-bar-R for precision machining.
Doesn't say I like it...just a warning.
Also, you may need 100% inspection if you are using the wrong SPC - like X-bar-R for precision machining.
V.J.Brahmaiah