Bulldozer Assembly Inc. $($BAI$)$ is a large assembler of bulldozers. A bulldozer is put together in three operations. In the common subassembly step, the transmission, drivetrain, and brake system are attached to the case and frame. The main assembly process then installs the chassis and the engine to the common subassembly. In final assembly the track and suspension are installed. The real$-$world diagram of this supply chain is more complex but has the same core processes as those just described.

The excel files named $$BulldozerNetworkNodes$.$csv

Download BulldozerNetworkNodes.csv$$ and $$BulldozerNetworkData$.$csv

Download BulldozerNetworkData.csv$$ can be used to generate a visual of the BAI supply chain in R$.$ BAI only has control of the safety$-$stock levels in facilities which it owns. Currently BAI owns the following facilities: Case and Frame $($CF$),$ Chassis$/$Platform manufacture $($CHP$),$ Common subassembly $($CSA$),$ Dressed$-$out$-$engine assembly $($DOE$),$ Final assembly $($FAS$),$ Main assembly $($MA$),$ and Suspension group $($SG$).$

The holding cost per unit of safety stock held in storage $($i$.$e$.,$ COST$)$ at the FROM location, along with the committed service time $($CST$),$ transit time $($i$.$e$.,$ TT$),$ and processing time $($i$.$e$.,$ FPT$)$ are provided in the excel file $$BulldozerCostOptimData$.$csv

Download BulldozerCostOptimData.csv$.$ All the provided times are measured in days. BAI is interested in adopting a hybrid strategy for its bulldozer supply chain in which a portion of the supply chain is managed based on push $($i$.$e$.,$ some locations have safety$-$stock$),$ while the other portions are based on pull $($i$.$e$.,$ some locations have no safety$-$stock$).$

BAI, and all its suppliers, use a safety factor $($i$.$e$.,$ z$)$ value of $1\mathrm{.}65$ to determine safety$-$stock levels. The average daily demand for bulldozers is $5$ and the daily standard deviation is $2.$ Note: The Excel CSV files above may differ between students.