Assume that a plant operates 2,000 hours per year and the demand rate for parts is 100,000 units per year. The circulation time for each kanban container is 24 hours.
a) How many kanban containers are needed for a container size of 100 parts?
b) What would be the effect of reducing the container size to 60 parts?
c) What is the takt time for this process?
d) What takt time is needed for 80,000 units per year?
- a) Number of kanban containers for a container size of 100 parts
The number of kanban containers needed for a container size of 100 parts is:
number of kanban containers = demand rate / (container size * circulation time)= 100,000 units / (100 parts * 24 hours/part)= 41.67 kanban containers
- b) Effect of reducing the container size to 60 parts
If the container size is reduced to 60 parts, then the number of kanban containers will increase to:
number of kanban containers = 100,000 units / (60 parts * 24 hours/part)= 66.67 kanban containers
This is because the smaller container size will lead to a shorter circulation time, which will mean that more kanban containers are needed to meet the demand rate.
- c) Takt time for this process
The takt time for this process is:
takt time = 1 / demand rate= 1 / 100,000 units/year= 200 / 1000 hours/year= 0.2 hours/unit
- d) Takt time for 80,000 units per year
The takt time for 80,000 units per year is:
takt time = 1 / demand rate= 1 / 80,000 units/year= 125 / 1000 hours/year= 0.125 hours/unit
Additional thoughts
The takt time is the time it takes to produce one unit of product at a given demand rate. It is important to maintain a consistent takt time in order to avoid bottlenecks and ensure that the demand rate is met.
Reducing the container size can help to improve the takt
time by reducing the amount of time that parts spend in the system. However, it is important to make sure that the demand rate can be met with the smaller container size.
Increasing the demand rate will also reduce the takt time. However, it is important to make sure that the system can handle the increased demand rate.
Ultimately, the takt time is a balancing act between the demand rate, the capacity of the system, and the container size.