What is a good PP and PPK value?

According to Six Sigma philosophy, Cp or Pp and Cpk or Ppk should be greater than 1.50. From a technical standpoint, Six Sigma deems a process being acceptable only after achieving a maximum defect rate of 3.4 parts per million opportunities.

What is a good PPK score?

If Ppk is 1.0, the system is producing 99.73% of its output within specifications. The larger the Ppk, the less the variation between process output and specifications. If Ppk is between 0 and 1.0, not all process output meets specifications.

What is PP and PPK values?

Process Performance Metrics. Pp is the performance index. It measures how well the data might fit between the spec limits (USL, LSL). It doesn't care if the process is centered within the limits only if it would fit if it was centered. Ppk is the performance centering index.

What does a high PPK value mean?

Generally, higher Ppk values indicate a more capable process. Lower Ppk values indicate that your process may need improvement.

Is a higher or lower PPK better?

When the Cpk calculation is a high number (general industry guideline is 1.66 or higher), then it is a good indication the process is statistically in control. If the Cpk and Ppk calculations are very close or equal, then there is an even better indication that the process is statically in control.

PROCESS CAPABILITY: Explaining Cp, Cpk, Pp, Ppk and HOW TO INTERPRET THOSE RESULTS

What does a PPK of 1.33 mean?

1.33 ≤ Ppk ≤ 1.67 The process may not meet customer requirements. After part approval, begin production with additional attention to the characteristic until an ongoing Cpk ≥ 1.33 is achieved. Ppk < 1.33. The process is substandard for meeting customer. requirements.

What is PP PPK CP Cpk?

Cp, Cpk, Pp and Ppk are all parameters (indices) that can help us to understand how our process is operating relative to the specifications, or in other words, they measure how close our process is running to its specification limits. For requirements we measure the process specifications.

What is acceptable Cpk value?

A Cpk value less than 1.0 is considered poor and the process is not capable. A value between 1.0 and 1.33 is considered barely capable, and a value greater than 1.33 is considered capable. But, you should aim for a Cpk value of 2.00 or higher where possible.

What is the difference between a Walther PP and PPK?

The PPK is shorter than the PP by 0.6″ and has no metal backstrap, so the grips wrap around the rear. The PPK also has a shorter grip, and the magazines hold one less round. The PPK/S is a combination of the two. It has the shorter barrel and slide of the PPK, but the longer grip of the PP.

How do you calculate PP and PPK?

Pp, Ppk In Relation to Z Scores

Ppk can be determined by diving the Z score by three. A z score is the same as a standard score; the number of standard deviations above the mean. Z = x – mean of the population / standard deviation.

How do you know if a process is capable?

The Cp index is a fundamental indication of process capability. The Cp value is calculated using the specification limits and the standard deviation of the process. Most companies require that the process Cp = 1.33 or greater.

What does a Cpk of 1.67 mean?

CPK >1.67 (Excellent, Capable)

How many standard deviations is 1.33 Cpk?

Note that Cp = Cpk = 1.33. The sigma level is now 4 – the specification limits are now four standard deviations away from the average.

What is the PPK for a Six Sigma process?

Ppk is a measurement of how close the center (the mean) is to either the upper spec. or the lower spec. It is generally accepted that you want to have at least six standard deviations between the mean and the nearest specification limit. Ppk however is not measured in single standard deviation units.

What is PP in Minitab?

Pp. Pp is a measure of the overall capability of the process. Pp is a ratio that compares two values: The specification spread (USL – LSL) The spread of the process (the 6-σ variation) based on the overall standard deviation.

What handgun is used by Navy SEALs?

In 2015, the Glock 19, a compact 9 mm, was added to the SEAL handgun inventory. The SEALs plan to eventually replace the P226s with the newer Glocks. For now, the M9 continues to be the primary sidearm for U.S. uniformed personnel worldwide and the P226 continues to be the primary handgun of the SEALs.

What does a Cpk of 0.5 mean?

Cpk = 0.5, good chance of process meeting customer's specification. Cpk = 1, process about meeting customer's specification. Cpk = 2, Great! Process meets customer's specification but can be improved upon. Cpk =3, Excellent result.

What is PPK?

Ppk is a common statistical tool used to assess process capability. Ppk represents the “Overall Capability” of the process. This long-term capability can be thought of as the quality the customer experiences.

What is considered high Cpk?

In summary, renal injury with high serum CPK values becomes a true concern when levels of CPK reach 5,000 IU/L and the patient has serious co-morbid disease such as volume depletion, sepsis or acidosis. Otherwise, values of up to 20,000 IU/L may be tolerated without untoward event.

Why is PPK higher than Cpk?

The automotive confusion aside, Ppk will always be greater than Cpk since Ppk is long term capabliity and Cpk is short term capability. The only way that Cpk will be greater than Ppk (other than a misuse of the terms and formulas) is under the conditions stated in a previous post.

Why PPK is lower than Cpk?

Cpk uses short term data, Ppk uses long term. Long term is always worse than short term which results in a Ppk which is less than Cpk.

How do you interpret process capability results?