Diagrams for Chapter 4 1. Histograms for left and right dimension. Red lines show the specification limits
15
Percent
10
5
0 20.2 20.7 21.2 21.7
left
20
Percent
10
0 20.2 20.7 21.2 21.7
right
On the following page, we have box plots that show the process performance by impression. Recall that the castings are made 8 at a time (i.e. each mold has 8 impressions).
21.5
21.0
left
20.5 20.0 1 2 3 4 5 6 7 8
impression
21.5
right
21.0
20.5 1 2 3 4 5 6 7 8
impression
The box plots show that the process can be improved (especially the right side) by better alignment of the impressions.