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Even though I've been using DP for sometime now, I really don't know that much about it. Our QE has asked a question of why a particular TP of a circle CPK is so high ( this is while printing out in the Statistics Report )? I'll leave the one problems below. CPK.jpg
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The Cpk is not high...it's the Ppk. That is interesting.
Can you plug the data into another software (Excel, Minitab, etc)? If not, supply the data and I can plug it in real quick and see what Minitab gets. -
you shouldn't do SPC on position of holes. You will NEVER get a good result, even if it shows great.
snap.jpgsigpic
Originally posted by AndersIComment
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Correct. And one cannot measure capability of the axis' because there is no tolerance.Originally posted by Matthew D. Hoedeman View Post
All one is showing with Ppk/Cpk is that your process can or cannot make it within the zone. It doesn't specify that it can actually make the part consistently in the same spot.Comment
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Did you look here :
Capability calculations for True Position - PC-DMIS User Forum (pcdmisforum.com)
Maybe it could help ?
(the last post of VinniUSMC should contain a right version)Comment
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Double posted this one in hopes of catching some more fish.
Since there isn't any omnidirectional data given for TP can a CPK be calculated in...09-25-2009, 11:58 AM -
I am new to Dataview and data page.
I have been asked to track CP and CPK on a production part.
The data appears to be valid but when I...07-18-2008, 10:28 AM -
How come when I get a value of none in the Cpk column of the Capability chart yet it also calls out "Y" for Cpk capable? If it is stating Yes...09-21-2009, 12:11 PM
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I've noticed that the calculated Cpk in DataPage does not match what is calculated in Minitab on the same data set. We don't use DataPage except to collect...07-14-2009, 12:41 PM
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Aside from using SPC software like QDAS. What are some ways you use to pull data from PCDMIS?
Currently I use assignments & write them...09-21-2020, 12:16 PM
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