For this purpose, he proposed an approach for small sized
casting, by making the casting weight as a determined factor for
the production planning. It is not possible to establish a
temperature specification for each casting. The weight class of
the casting to be poured should be adjusted by the worker. This
is possible by the adoption of Delta chart (Fig 5) described in
Sower et al [7] for minimizing the internal scrap due to
excessive variation in the pouring temperature. This chart
should be used as a descriptive statistical tool to help the
operator for adjusting the pouring temperature according to the
change in the weight of the casting [6] (Fig 6).