Cpk calculator

On the target. Most of the data exceed the target value.Step 3: Evaluate the capability of the processUse the main capability indices to evaluate how well your process meets requirements. Assess potential capability Use Cpk to evaluate the potential capability of your process based on both the process location and the process spread. Potential capability indicates the capability that could be achieved if process shifts and drifts were eliminated. Generally, higher Cpk values indicate a more capable process. Lower Cpk values indicate that your process may need improvement. Compare Cpk with a benchmark that represents the minimum value that is acceptable for your process. Many industries use a benchmark value of 1.33. If Cpk is lower than your benchmark, consider ways to improve your process, such as reducing its variation or shifting its location. Compare Cp and Cpk. If Cp and Cpk are approximately equal, then the process is centered between the specification limits. If Cp and Cpk differ, then the process is not centered. Key Result: CpkFor these process data, Cpk is 1.09. Because Cpk less than 1.33, the potential capability of the process does not meet requirements. The process is too close to the lower specification limit. The process is not centered, so Cpk does not equal Cp (2.76).Assess overall capability Use Ppk to evaluate the overall capability of your process based on both the process location and the process spread. Overall capability indicates the actual performance of your process that your customer experiences over time. Generally, higher Ppk values indicate a more capable process. Lower Ppk values indicate that your process may need improvement. Compare Ppk to a benchmark value that represents the minimum value that is acceptable for your process. Many industries use a benchmark value of 1.33. If Ppk is lower than your benchmark, consider ways to improve your process. Compare Pp and Ppk. If Pp and Ppk are approximately equal, then the process is centered between the specification limits. If Pp and Ppk differ, then the process is not centered. Compare Ppk and Cpk. When a process is in statistical control, Ppk and Cpk are approximately equal. The difference between Ppk and Cpk represents the improvement in process capability that you could expect if shifts and drifts in the process were eliminated. Key Result: PpkFor these process data, Ppk = 0.52. Because Ppk is less than 1.33, the overall capability of the process does not meet requirements. The process is centered, so Ppk ≈ Pp (0.53). However, Ppk ImportantThe Cpk and Ppk indices measure the capability of the process in relation only to the specification limit that is closest to the process mean. Therefore, these indices represent only one side of the process curve, and do not measure how the process performs on the other side of the process curve. If your process produces nonconforming items that fall outside both the lower and upper specification limits, use additional capability measures in the output to more fully assess process performance. For more information on other

Preetham - 2007 #1 Is it possible to get the negetive cpk value (theoritically) #3 preetham said: Is it possible to get the negetive cpk value (theoritically) It is, and not just theoretically: I have seen it happen when an operator set his machine up incorrectly (He misread the drawing and set it up with a target diameter well outside the tolerance limit). Producing something with the X-double bar value outside the specification limits will result in a negative CPk. Basically, a negative CPk means that you are driving beside the road. See the following piece in Quality Digest for a good explanation: /Claes quality.shesha #4 The Way U MeasureAs Claes said he had a experience when there was a setting error what the operator made, I too had a similar situation where in the operator had made a wrong setting with the measurement system.And once your mean gets shifted out of the spec limit your cpk goes towards negative.shesha quality.shesha #5 Hi Claes,I just went thru this he says the cpk goes negative when "The process is running to the high side, so no parts will be within specification limits"is cpk not negative when the "The process is running to the low side" ????????Shesha #6 Interesting that Cleary contradicts himself, or at the very least presents apparently contradictory answers in two different places. In the article cited above, he says, Which of the following is an accurate interpretation of negative Cpk? a. The process is running to the high side, so no parts will be within specification limits. b. The process is running to the low side, so no parts will be within specificationlimits. c. A small negative number for Cpk is of no consequence; the process would continue to produce within specification limits. d. Fifty percent of the parts are outside of specification limits. Answer A is correct. Then, at he says, regarding a negative Cpk value, The only accurate response is to say that when there is a negative Cpk, the process average must be above the upper or below lower spec limits Add to this the nonsensical statement leading off the QD article ("Understanding the Cpk index is essential to success") the author's apparent disconnection from the world of manufacturing reality, and you have an excellent case of "Consider the source." (Although the quoted statement about "...essential to success" was most likely the work of a QD staffer.) #7 Which of the following is an accurate interpretation of negative Cpk? a. The process is running to the high side, so no parts will be within specification limits. b. The process is running to the low side, so no parts will be within specificationlimits. c. A small negative number for Cpk is of no consequence; the process would continue to produce within specification limits. d. Fifty percent of the parts are outside of specification limits. Answer A is correct. The correct answer is "none of the above"!a. & b. are close. The process could be running either

Too high or too low, so either is almost correct. I say almost correect because the second clause is wrong. Most of the parts will be out ot spec, but some will still be in the spec range (at least if the Cpk is not too far negative).c. is clearly wrong. If the process center is outside the control limits, there is a serious problem!d. is actually quite close to correct. If Cpk is negative, then at least 50% will be outside the specs. (Note that the reverse is not true. Just because at least 50% are outside the specs does not guarantee that Cpk is negative.) (Note2: for badly skewed distributions, you could have negative Cpk and less than 50% outside specs, but then the few that are outside specs would have to be waaay outside the specs.)Tim F Marc Fully vaccinated are you? #9 Yes, you are all right, I was too hasty there. That explanation left a bit to be desired. I guess it serves me right for not reading all of it. /Claes #10 I think the proverbial bottom line is, if you need a negative Cpk value to tell you that you're producing stuff outside the spec limits, it's too late. Negative Cpks are almost always a sign of some sort of mistake or misunderstanding.

CriPakToolsTool to extract/update contents of CRIWARE's CPK archive format.This is based off of code uploaded by Falo's code released on the Xentax forums ( which was futher modified by Nanashi3 ( turned it into a command line application and added the ability to replace already existing files with the CPK archive.This theoretically should work with any CPK archive but I'm sure something will break it. I've tested it so far with Corpse Party 2U and Time Travelers both for PSP.I have no plans on adding the ability to create new files but if anyone wishes to, feel free.To use :CriPakTool.exe IN_FILE - Displays all contained chunks.CriPakTool.exe IN_FILE EXTRACT_ME - Extracts a file.CriPakTool.exe IN_FILE ALL - Extracts all files.CriPakTool.exe IN_FILE REPLACE_ME REPLACE_WITH [OUT_FILE] - Replaces REPLACE_ME with REPLACE_WITH. Optional output it as a new CPK file otherwise it's replaced.Be warned, I don't do much error checking so it'll probably crash if used in any way wrong :) It shouldn't break your computer... but I take no responsibility if somehow it explodes :)TODO :Add more error checkingClean up code

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