Shop Floor Control - CONWIP Configurations
7 important questions on Shop Floor Control - CONWIP Configurations
Why should CONWIP loops not be too long?
- A long CONWIP line or loop starts to behave like a push system
- Span of control issues will arise (14.2.3)
In a CONWIP line, what measure of WIP can be used for part types requiring vastly different process times, in order to maintain a level loading?
Time required at the botteleneck.
Why is FISFO a good job order protocol to predict completion times/dates?
Because jobs will exit the line the same order they were released. So cycle times and lead times will stay pretty much the same (in a stable system).
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1: What is meant by 'running a card deficit'?
2: When does it make sense to do this?
1: Releasing jobs without CONWIP cards into the line.
2: In situations where you don't want the bottleneck to starve. I.e. when a breakdown downstream of the bottleneck occurs.
What happens to a CONWIP loop when you put the CONWIP card count really high?
Then the loop ultimately behaves like a push line.
Consider a shared resource that requires 1 hour per job on routing A, 2 hours on routing B and 3 on C.
Of all jobs processed at this resource, 30% are from routing A, 40% from B and another 30% from C.
What are the average (inflated) processing times for products from routings A, B & C?
For jobs from routing A: (0,3+2*0,4+3*0,3)/0,3=6,67 jobs per hour.
For jobs from routing B: (0,3+2*0,4+3*0,3)/(2*0,4)=5 jobs per hour.
For jobs from routing C: (0,3+2*0,4+3*0,3)/(3*0,3)=6,67 jobs per hour.
Why is the assembly station in the example in 14.3.6 not treated as a shared resource?
Can assembly stations act as a shared resource at all?
It is not treated as a shared resource in the example because the assembly station belongs to both of the lines text-decorationat the same time. (You could say an assembly station processes multiple products, 2 in the example, at the same time.)
An assembly station can act as a shared resource.
This is the case when an assembly station has to assemble parts not only into one product, but when the station also has to assemble other products from another combination of lines.
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