In: Mechanical Engineering
Consider the following cookie making process at a bakery store. 1) Alice puts all the ingredients in a mixing bowl and mix them. 2) Bob spoons the cookie dough onto tray and puts tray into oven. 3) Cookies are baked in oven. Note: The oven is already programed to bake cookie for 20 minutes; Bob quickly pushes the Start button when after he puts tray into oven, and there is not any other oven operation needed during baking. 4) Cathy takes the cookies out of tray and pack them in to a bag. Answer question a) to f).
a) The task time of the cooking making process are as follows. Fill out the relevant resource for each task in the table.
Tasks Task Time Resource Relevant Resource
Put ingredients in bowl and mix them 5 min
Spoon dough to tray and put into oven 3 min
Bake cookies 20 min
Take cookie out of tray and pack to bag 4 min
b) Draw a process flow diagram of the cooking making process. Note: Put buffer between each two activities; the diagram should include the task description and resource.
c) Compute the capacity of each relevant resource.
d) Suppose there are infinite amount of ingredients available and there is an infinite demand of cookies during the work hours for the cookie store. Also suppose there is no ingredients waste during the process. Identify the bottleneck of the process and Calculate the capacity of the cookie making process. Hint: identify the bottleneck of the process.
e) Calculate the cycle time of the cookie making process.
f) Calculate the flow time of the cooking making process
Given Data,
5 Min to Mix whole
3 Min for spoon dough on try
20 Min bake cookies
4 Min to pack
Answer for (a):
Answer for (b):
Answer for (d):
Bottleneck Process:
The bottleneck is defined as the process step (station) in the flow diagram with the lowest capacity. Although the bottleneck is often the process step with the longest processing time, it is important to always look at the capacities for making a judgement.
In this case there is only one single line, so the best optimization of work process is to making the things in bulk.
Answer for (e):
Cycle Time:
Cycle time is the total time from the beginning to the end of your process, as defined by you and your customer. Cycle time includes process time, during which a unit is acted upon to bring it closer to an output, and delay time, during which a unit of work is spent waiting to take the next action.
Cycle time of the cookie making process = 5 + 3 + 20 + 4 = 32 Min
Answer for (f):
Flow Time:
The amount of time a flow unit spends in a business process from beginning to end, also known as the total processing time. If there is more than one path through the process, the flow time is equivalent to the length of the longest path.
In this case,
The Flow Time of the cooking making process = 32 Min