December 2014
Intermediate to advanced
154 pages
3h 33m
English
Content preview from Root Cause Analysis
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108 • Root Cause Analysis
EXAMPLE 10.3
Figure13.4 is an example of a multi- vari chart sampling plan. Figures13.5
through 13.7 show multi- vari chart results for coolant, machine, and bit,
respectively.
PROCEDURE
Step 1: Start a sampling plan by determining which three factors will be
considered.
Step 2: Determine the levels of each factor.
Old machine New machine
Old bit
a
a = More coolant
b = Less coolant
ba ba ba b
Old bitNew bit New bit
FIGURE 13.4
Example of a multi- vari chart sampling plan.
6
5
New
bit
New
bit
e dierence between
more and less coolant
Old
bit
Old
bit
Ra µm
4
3
2
Old machine New machine
> = More coolant
< = Less coolant
* = Average of the two factor ...
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