Quality Management 2017

A NALYZE

Control charts: Calculation of control limits

1. Individual value control chart

R

X LCL 3 

X

RAX . -  -  -



3

X

X

4

d

 d

2

and A

are constants

2

4

(see tables)

Center

line

Target

X





R

UCL

X

X

RAX .      

3



3

X

X

4

d

2

2. Moving range control chart

RD   -  -  R d R

R LCL 3 

3

R

R

3

3

d

2

 d are constants (see tables) 3 , D 3 ,and D 4

Center

line

Target

R





RD       R d R

UCL

R

3



3

R

R

3

4

d

2

03/10/17

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