Major departures from target process capability appear to
be associated to boring, showing that the main part
(Distribution n. 1) is biased toward averages around 10 μm,
not acceptable according to tolerance limits specified.
Furthermore, the other part (Distribution n. 2) is drastically
biased toward averages around 21 μm, producing an even
worse condition. This points out to substantial margins of
improvement by taking such steps as enforcing uniformity of
tool setting procedure, and of tool changing criteria.