Defining Pre-Control Zones - Statistical Process Control (SPC)

L

llemouse

#1
#1
If given a specification as 50.0 cm +- 10 cm, how would you sketch the pre-control zones for this specification, if this is all the information you are given? Labelling the nominal, upper and lower tolerance limits and end points of the green zone.

Have a nice day.

Thank you very much.
 
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A

Atul Khandekar

#2
#2
Welcome to the Cove, llemouse!

The Spec Width is divided in three parts.
The middle half is the green zone, The outer two are yellow, and the zones beyond the spec limits are red zones

<40 : Red
40-45: Yellow
45-55: Green
55-60: Yellow
>60 : Red

The following article would be useful:
http://www.symphonytech.com/articles/precontrol.htm

You'll also find a few good threads on Pre-Control if you do a 'Forum Search' for 'Pre-Control'.
 
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