Overview
You need to decide how many machines to assign to a worker. The time to load/unload a machine is 4 minutes; then the machine spends 10 minutes running automatically.
- In the synchronous servicing – ideal – case, how many machines will be assigned to one operator?
- Assume that extra w= 1.5 minutes are needed to clean the machine in each cycle; the operator earns $18/hr and the machine cost is $15/hr.
b.1. What the cycle time if n1 is decided?
b.2. What is the production rate if n1 is decided?
b.3. What is the total cost if n1 is decided?
b.4. What the cycle time if n2 is decided?
b.5. What is the production rate if n2 is decided?
b.6. What is the total cost if n2 is decided?
b.7. Based on the total cost, how many machines would you assign to the operator?
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A new employee at Science, Inc. took 180 and 140 minutes to complete assemblies fourth and eighth.
- Calculate this worker’s learning rate.
- Set up the corresponding learning equation.
- How many assemblies will it take the employee to achieve the standard time of 100 minutes?
- How long will it take to produce the total quantity of units (i.e., assemblies) in your answer c ?
- Assume that this employee stopped working after producing assembly #12 and came back to work a week later. Calculate the cycle time without remission, the cycle time with remission and the amount of remission time in minutes.
- What is the new learning equation, after coming back to start assembly #13.