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What mechanism do you use to control variable special characteristics?

A

Andrews

#1
What control mechanism do you use to control variable special characteristics?
a) Pre-control
b) Xbar - R chart
c) X- MR chart
 
Elsmar Forum Sponsor
A

Andrews

#2
selection

How do you select special characteristics? Do you select characteristics that do not affect fit,form,function,safety or next operation also ?
 
S
#3
To answer your first question, start with the X-bar & R. No reason, its just that it appears easier to me.

Special characteristics should be selected from characteristics that have a "special" effect on the fit, form, function, safety, environment and operations of the product and subsequent processes.
A "special" effect IMO, is one that would render the product or process non-usable or inefficient, unsafe, a hazard to the environment and/or create these incidents in subsequent processes.
 
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