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Best way to Chart an On-Going CPK Requirement

I

IRONPOORER

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#1
#1
I have several parts that I am required to maintain CPK and send charts with every shipment (several times/week). We get the measurement data daily or at start-up and what I ned is a CPK chart that I can simply input new data into and the oldest drops off the back of the 30 data points in the report.


Ideas?
 
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M

mwohlg

#2
#2
If you're good with Excel, you could set up a tab where you copy/paste the new data to the bottom of the column of old data, then delete the x-number of top rows to give you exactly 30 rows. Another tab runs the calculations and makes the charts, using the information in the first 30 rows of the data tab.

It's not automatic, but it's close...
 
bobdoering

bobdoering

Stop X-bar/R Madness!!
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#3
#3
I hope your process variation is one that is appropriate for Cpk calculations! Sounds like the big old Cpk rubber stamp hitting again!
 
I

IRONPOORER

Starting to get Involved
#4
#4
Actually it is a complete waste of time :mad:; I have a ?.020" tolerance and hold ?.001-.002" and am centered on nominal- usually giving CPKs in the high teens or low twenties. However it is a CC on the print and I must send cpk charts with the certs.
 
G

Golfman25

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#5
#5
IRONPOORER said:
Actually it is a complete waste of time :mad:; I have a ?.020" tolerance and hold ?.001-.002" and am centered on nominal- usually giving CPKs in the high teens or low twenties. However it is a CC on the print and I must send cpk charts with the certs.
Click to expand...
Consider yourself luck. We have requirements which are next to impossible to meet, but reality falls on deaf ears.

As for your charts, you can look into gainseeker. http://www.hertzler.com/software/products/gainseeker-statistical-process-control-software/

It keeps a running chart based on the last 25 values. You can print charts out using various data criteria. Or maybe you can program a spreadsheet to use a moving average of only the latest values you want.
 
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