Related calculations
If you use 2 levels of BBB you need to split your Allocated Time for Change Over between both. Always allocate the maximum to the level with the longest change over time.
Try to respect the proportion between the 2 types of change overs and the number of BBB of the first level. In our case the change over time for rubber is 40 minutes, more than 10 times the change over time for the profile and you have 3 BBB at the first level. Knowing that we have 12% of TACO, we can allocate:
- 12% x 3 x 40 / (3 x 40 + 70 x 4) = 3.6% for the change over of the rubber;
- 12% - 3.6% = 8.4% for the change over of the blades.
The 8.4% will be splited in 3. One third for each BBB of rubber
We can use our KANBAN calculation tool considering 3 "references", one per rubber. There are called Change Over Groups. The quantity for each Change Over Group will be the total equivalent quantity of blades to be produced with the related rubber. We use "equivalent" because each blade has a different length, so a different production time. The best is to use a cycle time in length unit per second. The change over of all these groups is 40 minutes.
Then, you need to input all the blade references with their data and link them to their related change over group.
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