Hey all
I have some problems regarding the formula for calculating the numbers of kanbans in SAP.
They use the same formula as in the theory, but they add a C which is default to the value of 1 (indicating that the container is registered as empty when the last piece is used).
Taking an example:
Demand = 10 pr day
Lead time = 2 days
Container size = 5
Safety factor = 50%
The container is empty when it is completely empty (C=1) - As in the theory!??
The theory would say that we need:
(DL (1+SF))/a = (102(1,5))/5 = 6 containers.
SAP says:
((RTAC)/CONT)SF + C = ((210)/5)1,5 + 1 = 7 kanbans
Why does the theory say that we need 65 = 30 units in the cycle and kanban says that we need 57 units?
If we set the constant to 0 we would get the right number, but in effect we would set the kanban to empty when it was almost full, so we would still get 5*6 = 30 kanbans + the kanban that is marked as empty but in reality is full.
Please help.
Thank you very much.
Message was edited by:
Nina Henriksen
Hi Nina,
In the calculation SF is 0.5 you have taken as 1.5.
((RTAC)/CONT)SF + C = ((210)/5)0,5 + 1 = 3 kanbans
Regards,
Senthilkumar
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