Sub City
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School
State College of Florida, Manatee-Sarasota *
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Course
OPERATIONS
Subject
Health Science
Date
Feb 20, 2024
Type
Pages
3
Uploaded by EarlFerretMaster49
Sub City, a popular sandwich shop in Marshalltown, Iowa, offers 3 types of sandwiches:
•
Grilled vegetables. •
Grilled chicken •
Pastrami Demand (in sandwiches per hour) are Grilled Vegetables - 25, Grilled Chicken - 15, and Pastrami - 10. There are up to five steps in the process of making sandwiches, listed below with processing times.
Step
Grilled Vegetables
Grilled Chicken
Pastrami
Cut bread
.75 minutes
.75 minutes
.75 minutes
Grill
1.4 minutes
1.4 minutes
____
Slice meat
____
____
3 minutes
Toast
2 minutes
2 minutes
2 minutes
Wrap
.5 minutes
.5 minutes
.5 minutes
Only 50 percent of customers want their sandwich toasted, no matter which sandwich is ordered. Suppose Sub City employs 1 worker at each step, and they could not assist the other worker at a station next to them due to cleanliness reasons. 1.
What is the implied utilization of each of the five steps in this process? Cut Bread (25x.75) +(15x.75) +(10+.75) =37.5/60=.625 Grill (25x1.4) +(15x1.4) =56/60=.933 Slice Meat (10x3) =30/60=.5 Toast (25x2) +(15x2) +(10x2) = 1.67 Wrap (25x.5) +(15x.5) +(10x.5) =.417 2.
From this utilization, is this a “demand
-
limited” or “process
-
limited” system? How can you tell? This indicates a process-limited system. In a demand-limited system, demand wouldn't be able to keep up with the processing capacity, which is not the case here. The maximum flow rate is constrained by the capabilities of the process itself. 3.
What is the actual and maximum flow rates of the three sandwich types? Explain the differences? Grilled Vegetables: Actual flow rate: 21 sandwiches per minute (Grill step) Maximum flow rate: 11.25 sandwiches per minute (Cut bread step) Grilled Chicken: Actual flow rate: 35 sandwiches per minute (Grill step) Maximum flow rate: 18.75 sandwiches per minute (Cut bread step) Pastrami: Actual flow rate: 3 sandwiches per minute (Slice meat step) Maximum flow rate: 7.5 sandwiches per minute (Cut bread step)
4.
If you were allowed due to system upgrades that workers could assist workers to their left or right- but not cross over workstations- what would be your first step in allowing workers to share at a station? That is, which two stations would you combine to share first? Explain your rationale and the expected effectiveness. If workers could assist neighboring stations, the most impactful combination would be merging the "Slicing Meat" and "Toasting" stations. Both have low utilization. Combining them wouldn't overload either worker.They are consecutive steps: This minimizes movement and context switching for the worker. Toasting only happens for half the orders: The worker can focus on slicing meat the rest of the time. This change is expected to be effective because it balances the workload: The combined station would have a workload closer to 34%, making it more manageable for one worker. It reduces idle time, and the worker can utilize the unused toasting time for slicing meat, potentially increasing overall throughput.
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