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Lean Systems. Characteristics of Lean Systems: Just-in-Time Pull method of materials flow Pull method of materials flow Consistently high quality Consistently.

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Presentation on theme: "Lean Systems. Characteristics of Lean Systems: Just-in-Time Pull method of materials flow Pull method of materials flow Consistently high quality Consistently."— Presentation transcript:

1 Lean Systems

2 Characteristics of Lean Systems: Just-in-Time Pull method of materials flow Pull method of materials flow Consistently high quality Consistently high quality Small lot sizes Small lot sizes Uniform workstation loads Uniform workstation loads Standardized components and work methods Standardized components and work methods Close supplier ties Close supplier ties Flexible workforce Flexible workforce Line flows Line flows Automated production Automated production Preventive maintenance Preventive maintenance

3 Lot Size and Cycle Inventory

4 Lot size = 100 On-hand inventory Time (hours) 100 – 75 – 50 – 25 – 0 – Average cycle inventory Figure 16.1

5 Lot Size and Cycle Inventory Average cycle inventory Lot size = 100 On-hand inventory Time (hours) 100 – 75 – 50 – 25 – 0 – Figure 16.1

6 Lot Size and Cycle Inventory Average cycle inventory Lot size = 100 Lot size = 50 On-hand inventory Time (hours) 100 – 75 – 50 – 25 – 0 – Figure 16.1

7 Lot Size and Cycle Inventory Average cycle inventory Lot size = 100 Lot size = 50 On-hand inventory Time (hours) 100 – 75 – 50 – 25 – 0 – Figure 16.1

8 Lot Size and Cycle Inventory Average cycle inventory Lot size = 100 Lot size = 50 On-hand inventory Time (hours) 100 – 75 – 50 – 25 – 0 – Figure 16.1

9 Figure 16.2 Scrap Unreliable suppliers Capacity imbalance Continuous Improvement with Lean Systems

10 Single-Card Kanban System

11 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

12 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

13 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

14 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

15 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

16 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

17 Storage area Empty containers Full containers Single-Card Kanban System Receiving post Kanban card for product 1 Kanban card for product 2 Figure 16.3 Fabrication cell O1O1 O2O2 O3O3 O2O2 Assembly line 1 Assembly line 2

18 Single-Card Kanban System KANBAN Part Number: Z Location:Aisle 5 Bin 47 Lot Quantity:6 Supplier:WS 83 Customer:WS 116 Each container must have a card Each container must have a card Assembly always withdraws from fabrication (pull system) Assembly always withdraws from fabrication (pull system) Containers cannot be moved without a kanban Containers cannot be moved without a kanban Containers should contain the same number of parts Containers should contain the same number of parts Only good parts are passed along Only good parts are passed along Production should not exceed authorization Production should not exceed authorization

19 Number of Containers

20 k = d( w + p )( 1 + ) c d = 2000 units/day p = 0.02 day = 0.10 w = 0.08 day c = 22 units Westerville Auto Parts Example 16.1

21 Number of Containers k = 2000( )( ) 22 d = 2000 units/day p = 0.02 day = 0.10 w = 0.08 day c = 22 units Westerville Auto Parts Example 16.1

22 Number of Containers k = 2000( )( ) 22 d = 2000 units/day p = 0.02 day = 0.10 w = 0.08 day c = 22 units Westerville Auto Parts Example 16.1

23 Number of Containers k = 10 containers d = 2000 units/day p = 0.02 day = 0.10 w = 0.08 day c = 22 units Westerville Auto Parts Example 16.1

24 Number of Containers d = 2000 units/day p = 0.02 day = w = 0.06 day c = 22 units Westerville Auto Parts k = d( w + p )( 1 + ) c k = 10 containers Example 16.1

25 Number of Containers d = 2000 units/day p = 0.02 day = w = 0.06 day c = 22 units Westerville Auto Parts k = 2000( )(1.10) 22 k = 10 containers Example 16.1

26 Number of Containers d = 2000 units/day p = 0.02 day = w = 0.06 day c = 22 units Westerville Auto Parts k = 2000( )(1.10) 22 k = 10 containers Example 16.1

27 Number of Containers d = 2000 units/day p = 0.02 day = w = 0.06 day c = 22 units Westerville Auto Parts k = 8 containers k = 10 containers Example 16.1

28 Number of Containers Westerville Auto Parts d = 2000 units/day p = 0.02 day = w = 0.06 day c = 22 units k = 8 containers k = 10 containers Figure 16.4

29 Lean Systems in Services Consistently high quality Uniform facility loads Standardized work methods Close supplier ties Flexible workforce Automation Preventive maintenance Pull method of materials flow Line flows

30 Operational Benefits Reduce space requirements Reduce inventory investment Reduce lead times Increase labor productivity Increase equipment utilization Reduce paperwork and simple planning systems Valid priorities for scheduling Workforce participation Increase product quality


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