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I have been working on Kanban sizing and found this helpful formula. I thought I would share it with the Networking Forum.
The formula:
Where,
Y: number of cards
D: demand per unit of time
T: lead time
C: container capacity
X: buffer, or safety factor
For example, suppose that hourly demand was 200 units, lead time was 12 hours, and the container capacity was 144 units. Assume that there was variation in lead time or demand, then we can set the safety factor to 15%:
Y = ((200*12)*(1+.15)) / 144= 20 Kanban Cards
How many hours worth of demand will 20 cards represent?
(20 cards * 144 units) = 2880 units
2880 / 200 units per hour = 14.4 hours worth of material
As you can see, this simple yet effective visual approach that encourages flow, reduces the need for forecasting — and all forecasting is almost always wrong no matter which model you choose — and the Kanban reinforces coordination and cooperation within a system.
I found this from Shumla (Blog). It is much easier than the formula I had been using from John Constanza JIT.
Hope this is helpful to someone else! Forward to me from network affiliate Rosemary.
The formula:
Where,
Y: number of cards
D: demand per unit of time
T: lead time
C: container capacity
X: buffer, or safety factor
For example, suppose that hourly demand was 200 units, lead time was 12 hours, and the container capacity was 144 units. Assume that there was variation in lead time or demand, then we can set the safety factor to 15%:
Y = ((200*12)*(1+.15)) / 144= 20 Kanban Cards
How many hours worth of demand will 20 cards represent?
(20 cards * 144 units) = 2880 units
2880 / 200 units per hour = 14.4 hours worth of material
As you can see, this simple yet effective visual approach that encourages flow, reduces the need for forecasting — and all forecasting is almost always wrong no matter which model you choose — and the Kanban reinforces coordination and cooperation within a system.
I found this from Shumla (Blog). It is much easier than the formula I had been using from John Constanza JIT.
Hope this is helpful to someone else! Forward to me from network affiliate Rosemary.
