Problem 4.2: Part (a) TFT = = 26 Take order wash mix

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Presentation transcript:

Problem 4.2: Part (a) TFT = 6+2+1+9+5+2+1 = 26 Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order TFT = 6+2+1+9+5+2+1 = 26

Part (a): Gant Chart and the theoretical flow time for 1 doz orders Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order wash mix spoon l s u l box g p bake cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Part (b): general explanations; mix can handle 2 doz, oven 1 doz Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order Flow unit = 1 order of 2 dozen. Certain activities can be performed in parallel. For example, while the oven is baking the first dozen, You can spoon the dough for the second dozen into another tray. Therefore, the flow time of such an order is not simply the sum of the activity times. A useful tool is a Gantt chart that shows the times during which different resources of interest are occupied for various activities. The dough for the 2 dozen cookies is mixed by You in 6 minutes and subsequently you spoon dough for 1 dozen in 2 minutes. Therefore in the 8th minute, the RM is ready to load the oven and set timer, which takes 1 minute. The oven starts baking the first dozen at the 9th minute and completes baking at the 18th minute. Meanwhile, You spoon the second dozen into another tray. At the 18th minute, the RM unloads the first tray from the oven and loads the second tray into the oven and sets the timer. So the second dozen starts baking at the 19th minute. While the second dozen bakes, the first dozen cookies cool and RM packs them into a bag, which takes a total of 7 minutes. At the 28th minute the second dozen finishes baking at which time the RM unloads the tray. After cooling for 5 minutes, the RM packs the second dozen in 2 minutes by the 35th minute. Finally, payment for the order and delivery to customer takes place in the 36th minute. The theoretical flow time for an order of 2 dozen cookies is 36 minutes.

Part (b): Gant Chart and the theoretical flow time for 2 doz orders Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order wash mix spoon spoon l s u l l s u l bake bake cool cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Part (b): Gant Chart and the theoretical flow time for 2 doz orders (cont.) Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order 2 box g p cool 31 32 33 34 35 36 37 38 39 40

Part (b): CPM Take order wash mix spoon spoon load & set bake unlo- ad 6/1-2 doz 2 spoon load & set bake unlo- ad cool box get paid 1/order 2 1 9 5 2 load & set bake unlo- ad cool 1 9 5

Part (b): CPM 6 6 8 Take order wash mix spoon 6/1-2 doz 2 18 19 19 28 28 28 28 33 33 35 8 10 35 36 10 spoon load & set bake unlo- ad cool box get paid 1/order 18 23 2 1 9 5 2 18 18 18 8 9 9 18 23 load & set bake unlo- ad cool 1 9 5

Forward Path Max = 30 35 10 35 30 20 5

Part (b): CPM 6 6 8 Take order wash mix spoon 6/1-2 doz 2 6 6 8 18 19 28 28 28 28 33 33 35 8 10 35 36 10 spoon load & set bake unlo- ad cool box get paid 1/order 18 18 35 16 2 18 1 19 19 9 28 28 28 28 5 33 33 2 35 36 18 18 8 9 9 18 18 18 23 load & set bake unlo- ad cool 8 9 9 18 18 18 28 33 1 9 5

Backward Path Min = 35 30 30 35 45 5

Part (b1): theoretical flow time when buying a second oven with 1 doz capacity Take order wash mix spoon load & set bake unlo- ad cool pack get pay 6/1-2 doz 2 1 9 5 2 1/order wash mix spoon spoon l s l s u l u l box g p bake bake cool cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Part (b1): CPM spoon load & set bake unlo- ad cool box get paid Take 2 1 9 5 box get paid Take order wash mix spoon 2 1/order 6/1-2 doz 2 load & set bake unlo- ad cool 1 9 5

We do not need CPM since activities are sequential Part (b2): theoretical flow time when buying a large oven with 2 doz capacity Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order wash mix spoon spoon l s u l box g p bake cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 We do not need CPM since activities are sequential

Part (b3): theoretical flow time when buying a fast oven with 1 doz capacity Take order wash mix spoon load & set bake unlo- ad cool box get paid 6/1-2 doz 2 1 9 5 2 1/order wash mix spoon spoon l s u l l s u l box g p bake bake cool cool 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 CPM is the same as the CPM for original case, just bake time is 6 min instead of 9 min.

Trade-off Analysis No Investment 36 Second Oven 28 Large Oven 28 Fast Ovens 30 The second oven leads to the shortest flow time Perhaps is cheaper than a large oven or 2 fast ovens