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Scheduling

Scheduling. Characteristics of a “job”. Constituent operations Due date Time of arrival in shop Starting time Completion time Flow time Lateness. Characteristics of a schedule. Two basic types of scheduling Work-force scheduling Operations scheduling. Operations Scheduling.

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Scheduling

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  1. Scheduling

  2. Characteristics of a “job” • Constituent operations • Due date • Time of arrival in shop • Starting time • Completion time • Flow time • Lateness

  3. Characteristics of a schedule Two basic types of scheduling • Work-force scheduling • Operations scheduling

  4. Operations Scheduling short-term plans designed to implement the master production schedule • job shop • flow shop

  5. Timing of job/operations scheduled (Gantt chart) • Job or activity progress chart • Machine chart For n jobs, each requiring m machines there are (n!)m possible schedules

  6. Measures • Average flow time of jobs • Average lateness of jobs • Makespan • Idle time • Past Due • WIP • Utilization Which of these would Goldratt have said was best?

  7. Scheduling heuristics • FCFS – first come, first served • SPT – shortest processing time • EDD – earliest due date

  8. Information Needed for Scheduling • Question: What information do you feel is needed to accurately schedule an operation?

  9. Scheduling Class Activity At the beginning: 400 birch in inventory 100 cherry past due Equipment is set up for cherry

  10. Scheduling Game Process. • I will give you demand for week • Decide on how much of each type to process – don’t forget open orders & birch forecast! • Record on decision log • Make a feasible schedule (don’t forget setups) • Turn in decision for week to me • When complete wait for actual birch demand for week • Calculate profit/loss – give total to me • Get demand for new week

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