The University of Lusaka (UNILUS) has invested in a Printing Press to address the challenges it experienced with outsourced printing services that emerged during the Covid-19 pandemic. The press will be used for both University requirements and other outside clients so as to optimise the use of resources in the Printing Section (UNILUS Printers) so established as a result. Required: A. UNILUS Printers has the following set of seven jobs as shown in the table below to be processed through its Press machine and then binding machine. Processing time at each of these work centres is as shown in the table. What is the optimal sequence for these jobs to be scheduled? How long will it take to
The University of Lusaka (UNILUS) has invested in a Printing Press to address the
challenges it experienced with outsourced printing services that emerged during the
Covid-19 pandemic. The press will be used for both University requirements and
other outside clients so as to optimise the use of resources in the Printing Section
(UNILUS Printers) so established as a result.
Required:
A. UNILUS Printers has the following set of seven jobs as shown in the table below
to be processed through its Press machine and then binding machine.
Processing time at each of these work centres is as shown in the table. What is
the optimal sequence for these jobs to be
complete all the seven jobs based on your optimal solution? Use a Gantt Chart to
show the times.
| Job | Printing hours | Binding hours |
| A | 15 | 3 |
| B | 7 | 9 |
| C | 4 | 10 |
| D | 7 | 6 |
| E | 10 | 9 |
| F | 4 | 5 |
| G | 7 | 8 |
B. UNILUS Printers has received request to print standard documents and
brochures for customers. These being standard jobs, the operations manager at
UNILUS Printers has standardised the set-up costs for such jobs. Each job
usually requires a different set-up and these changeovers have different costs.
The operations manager must decide the job sequence for the 8 jobs to minimise change-over costs. The table below shows the determined changeover costs
between jobs.
FACILITY CHANGE-OVER COSTS ($)
JOBS THAT PRECEDE
| A | B | C | D | E | F | G | H | ||
| Jobs that follow | A | - | 15 | 12 | 20 | 10 | 20 | 15 | 20 |
| Jobs that follow | B | 15 | - | 7 | 10 | 20 | 15 | 5 | 17 |
| Jobs that follow | C | 6 | 20 | - | 35 | 27 | 10 | 20 | 10 |
| Jobs that follow | D | 25 | 10 | 10 | - | 35 | 25 | 10 | 11 |
| Jobs that follow | E | 20 | 25 | 15 | 30 | - | 15 | 25 | 25 |
| Jobs that follow | F | 30 | 25 | 5 | 12 | 25 | - | 35 | 15 |
| Jobs that follow | G | 12 | 30 | 20 | 15 | 24 | 6 | - | 30 |
| Jobs that follow | H | 10 | 9 | 30 | 20 | 11 | 25 | 17 | - |
Use the least change over rule to develop a job sequence. What is the total
change over cost for the eight jobs?
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