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  Statistical Techniques and 6 Sigma
  Inspection Frequency

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Author Topic:   Inspection Frequency
Don Watt
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Posts: 70
From:Notts,United Kingdom
Registered: Mar 2000

posted 06 April 2000 05:59 PM     Click Here to See the Profile for Don Watt   Click Here to Email Don Watt     Edit/Delete Message   Reply w/Quote
Hi,
I'm relatively new to Quality in Manufacturing and I'm trying to establish how often we need to do a confirmation check on parts from a grinding process.
Is there any recognised correlation between process capability indices and inspection.
e.g. for a Cpk <1.33 recommended minimum inspection frequency = 1 in 50 ?

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 08 April 2000 09:26 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Not that I know of - maybe one of the experts can comment on this.

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Sam
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Registered: Sep 1999

posted 10 April 2000 08:50 AM     Click Here to See the Profile for Sam   Click Here to Email Sam     Edit/Delete Message   Reply w/Quote
No expert here,but,I will make the assumption that you are using SPC charting. If so, and the process is in statistical control, then there is no defined interval. Watch the chart for trends and act accordingly.
On the other hand ,if you are asking how many times do you check and record on the chart; minimum of once per shift. IMO I would use sampling based on number of parts produced to determine how many times to take a subgroup.
Don has some excellent articles on his web site for sampling.

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Don Winton
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From:Tullahoma, TN
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posted 10 April 2000 09:53 AM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Is there any recognised correlation between process capability indices and inspection. e.g. for a Cpk <1.33 recommended minimum inspection frequency = 1 in 50 ?

As far as I know, there is not a recognized relationship between process capability and sample frequency. This is probably best defined by your process.

Regards,
dWizard

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