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Scheduling

Scheduling. Manufacturing Process. Shipping Department. Raw Materials. Legend:. Batch of parts. Workstation. Manufacturing Process. Shipping Department. Raw Materials. Legend:. Batch of parts. Workstation. Manufacturing Process. Shipping Department. Raw Materials. Legend:.

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Scheduling

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  1. Scheduling

  2. Manufacturing Process

  3. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  4. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  5. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  6. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  7. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  8. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  9. Shipping Department Raw Materials Legend: Batch of parts Workstation Manufacturing Process

  10. Gantt Charts

  11. Job 4/17 4/18 4/19 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Ford Plymouth Pontiac Gantt Charts Progress Chart Figure 17.2

  12. Job 4/17 4/18 4/19 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Ford Plymouth Pontiac Gantt Charts Progress Chart Figure 17.2

  13. Job 4/17 4/18 4/19 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Ford Plymouth Pontiac Gantt Charts Progress Chart Figure 17.2

  14. Current date Job 4/17 4/18 4/19 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Ford Plymouth Pontiac Gantt Charts Progress Chart Figure 17.2

  15. Machine 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Grinder Lathe Gantt Charts Machine Chart Figure 17.3

  16. Machine 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Plymouth Pontiac Ford Grinder Pontiac Plymouth Ford Lathe Gantt Charts Machine Chart Figure 17.3

  17. Machine 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Plymouth Pontiac Ford Grinder Pontiac Plymouth Ford Lathe Gantt Charts Machine Chart Figure 17.3

  18. Current date Machine 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Plymouth Pontiac Ford Grinder Pontiac Plymouth Ford Lathe Gantt Charts Machine Chart Figure 17.3

  19. Performance Measures • Job flow time = Time of completion - Time job was available for first processing • Makespan = Time of completion of last job - Starting time of first job • Past due • Work-in-process inventory • Total inventory = Scheduled receipts for all items + On-hand inventories of all items • Utilization = Productive work time/Total work time available

  20. Dispatching Procedures - Static • Earliest due date (EDD) • First come, first served (FCFS) • Last come, first served (LCFS) • Shortest processing time (SPT)

  21. Dispatching Procedures - Dynamic • Critical ratio ( CR )(Due date - Today’s date) / Total shop time remaining • Slack time remaining (STR) Time to due date - Total shop time remaining • Slack per remaining operations (STR/OP)STR / Number of operations remaining

  22. Sequencing Single-Dimension Rules

  23. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 8 10 Explorer 6 12 Econoline 150 3 18 Bronco 15 20 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  24. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 Explorer 6 12 Econoline 150 3 18 Bronco 15 20 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  25. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 6 12 Econoline 150 3 18 Bronco 15 20 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  26. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 3 18 Bronco 15 20 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  27. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 15 20 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  28. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 12 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  29. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1

  30. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 8 + 14 + 17 + 32 + 44 5 Average job flow time = Sequencing Single-Dimension Rules - EDD Example 17.1

  31. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours

  32. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 2 + 0 + 1 + 0 + 0 5 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early =

  33. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour

  34. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 0 + 2 + 0 + 12 + 22 5 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due =

  35. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours

  36. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sum of flow times Makespan Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP =

  37. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 8 + 14 + 17 + 32 + 44 44 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP =

  38. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP = 2.61 blocks

  39. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sum of time in system Makespan Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP = 2.61 blocks Average total inventory =

  40. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 10 + 14 + 18 + 32 + 44 44 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP = 2.61 blocks Average total inventory =

  41. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Ranger 0 + 8 = 8 10 10 2 Explorer 8 + 6 = 14 12 14 2 Econoline 150 14 + 3 = 17 18 18 1 Bronco 17 + 15 = 32 20 32 12 Thunderbird 32 + 12 = 44 22 44 22 Sequencing Single-Dimension Rules - EDD Example 17.1 Average job flow time = 23 hours Average hours early = 0.6 hour Average hours past due = 7.2 hours Average WIP = 2.61 blocks Average total inventory = 2.68 engine blocks

  42. Sequencing Single-Dimension Rules - SPT Example 17.1

  43. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Econoline 150 0 + 3 = 3 18 18 15 Explorer 3 + 6 = 9 12 12 3 Ranger 6 + 8 = 17 10 17 7 Thunderbird 17 + 12 = 29 22 29 7 Bronco 29 + 15 = 44 20 44 24 Sequencing Single-Dimension Rules - SPT Example 17.1 Average job flow time = 20.4 hours Average hours early = 3.6 hour Average hours past due = 7.6 hours Average WIP = 2.32 blocks Average total inventory = 2.73 engine blocks

  44. Job Scheduled Actual Engine Processing Flow Customer Customer Hours Block Begin Time Time Pickup Pickup Hours Past Sequence Work (hr) (hr) Time Time Early Due Rule Comparison Econoline 150 0 + 3 = 3 18 18 15 Explorer 3 + 6 = 9 12 12 3 Ranger 6 + 8 = 17 10 17 7 Thunderbird 17 + 12 = 29 22 29 7 Bronco 29 + 15 = 44 20 44 24 EDD SPT Average job flow time 23 20.4 Average hours early 0.6 3.6 Average hours past due 7.2 7.6 Average WIP 2.61 2.32 Average total inventory 2.68 2.73 Sequencing Single-Dimension Rules - SPT Example 17.1 Average job flow time = 20.4 hours Average hours early = 3.6 hour Average hours past due = 7.6 hours Average WIP = 2.32 blocks Average total inventory = 2.73 engine blocks

  45. Sequencing Multiple-Dimension Rules

  46. Operation Time Time at Remaining Number of Engine to Due Date Operations Shop Time Job Lathe (hr) (Days) Remaining Remaining CR S/RO 1 2.3 15 10 6.1 2 10.5 10 2 7.8 3 6.2 20 12 14.5 4 15.6 8 5 10.2 Sequencing Multiple-Dimension Rules Example 17.2

  47. Operation Time Time at Remaining Number of Engine to Due Date Operations Shop Time Job Lathe (hr) (Days) Remaining Remaining CR S/RO 1 2.3 15 10 6.1 2 10.5 10 2 7.8 3 6.2 20 12 14.5 4 15.6 8 5 10.2 Time remaining to due date Shop time remaining CR = Sequencing Multiple-Dimension Rules Example 17.2

  48. Operation Time Time at Remaining Number of Engine to Due Date Operations Shop Time Job Lathe (hr) (Days) Remaining Remaining CR S/RO 1 2.3 15 10 6.1 2 10.5 10 2 7.8 3 6.2 20 12 14.5 4 15.6 8 5 10.2 Sequencing Multiple-Dimension Rules 15 6.1 CR = Example 17.2

  49. Operation Time Time at Remaining Number of Engine to Due Date Operations Shop Time Job Lathe (hr) (Days) Remaining Remaining CR S/RO 1 2.3 15 10 6.1 2 10.5 10 2 7.8 3 6.2 20 12 14.5 4 15.6 8 5 10.2 Sequencing Multiple-Dimension Rules 15 6.1 CR = = 2.46 Example 17.2

  50. Operation Time Time at Remaining Number of Engine to Due Date Operations Shop Time Job Lathe (hr) (Days) Remaining Remaining CR S/RO 1 2.3 15 10 6.1 2.46 2 10.5 10 2 7.8 3 6.2 20 12 14.5 4 15.6 8 5 10.2 Sequencing Multiple-Dimension Rules 15 6.1 CR = = 2.46 Example 17.2

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