Benutzerhandbuch MenĂŒ

Benutzerhandbuch

Centering the Ppk procedure

Calculations of the Cp and Pp do not take into account the process variability or procedure centering. Indeed, the following figure shows that the two processes have a Pp of 1.6.
Ppk illustration 2
Ppk illustration 3
It is clear that the lower process creates more off-tolerance parts than the left hand process. Yet, this is not seen in the pp calculation because, for the two processes, we have:
It is therefore appropriate to introduce a new indicator, the Ppk. The Ppk corresponds to the true procedure performance and is calculated in the following way:
Let us take the following example:
Ppk illustration 2
In this case:

Let us take the following example:

Ppk illustration 3
In this case:
The Ppk makes it possible to differentiate the two processes.
In the same way, the Cpk can be calculated, which is the equivalent of the Ppk but uses short term variability.

Eine Komplettlösung fĂŒr Industrie 4.0

8 statistische Module

trial

Versuch

€ 0

30 Tage

Testen Sie es kostenlos

APC

SPC

Kontrolle

Analyse

check

30 Tage

check

Alle Funktionen von Ellistat

check

1 Benutzer

Technische UnterstĂŒtzung und Wartung inbegriffen

student

Student

€ 0

1 Jahr

Zur Kasse

Analyse

check

1 Jahr

check

Alle Funktionen von Ellistat

check

1 Benutzer

check

Lizenz fĂŒr Studenten, die ĂŒber einen gĂŒltigen Studentenausweis verfĂŒgen

Technische UnterstĂŒtzung und Wartung inbegriffen

standard

Standard

€ 49

pro Benutzer pro Monat

Zur Kasse

Analyse

check

Lizenz wird alle zwei Monate erneuert

check

Alle Funktionen von Ellistat

check

Unbegrenzter Benutzer

check

Technische UnterstĂŒtzung und Wartung inbegriffen