Throughput time variation reduction
On-time
delivery of products (FR-112) is dependent on the reduction of variation in
throughput time. Throughput time variation is largely a consequence of the
degree of disruptions in the manufacturing system as well as how these
disruptions are resolved. Disruptions as indicated by the MSDD are problems
that lead to a loss in system availability. Quality problems, though
disruptive to a manufacturing system, are treated separately under the
previously described FR-111 “Manufacture products to target design
specifications” branch and therefore the decomposition of DP-112
(Throughput time variation reduction) considers only disruptions that do
not result from quality problems. Figure 1 shows the first level of
decomposition of FR/DP-112.
Figure
1 Decomposition of throughput time variation reduction.
Decreasing
the variation of delivery time to the customer requires a manufacturing
system to have predictable output. With greater predictability, a company
can make promises to its customers with the confidence and assurance that
it can meet promised delivery times. When customers consistently receive
products in the same amount of time from one order to the next, they are
likely to gain confidence in the ability of the manufacturer to satisfy
their orders. The result is a strengthened business relationship.
The
requirement to produce with a predictable time output reflects a
manufacturing system’s ability to decrease variation in delivery time.
Producing in a consistent and timely manner can be done when production
resources are reliable and in themselves predictable. The resources that
affect timely production are having sufficient material supply, adequate
machine availability, and consistent labor productivity. The ability to
resolve production disruptions (DP-R1) is a prerequisite for minimizing
production disruptions. Thus, the design matrix for the decomposition
expresses a partially coupled design as shown in Figure 1.
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