Tour - session 8 Detailed Scheduling e-Prelude.com Tour - session 8 Detailed Scheduling

Planned to Firm Work Order Conversion Access: Planning menu, Planned to Firm Work Order Conversion option Planned Work Orders Firm Work Orders Converts all the Planned Work Orders with a release date earlier or equal to the end date specified

Firm Work Orders Access: Scheduling menu, Firm Work Order List option

3 – Enter Machine information Machine Entry Access: Engineering menu, Work Center Maintenance option 2 – Click on ‘Machines’ 1 - Select a work center 3 – Enter Machine information 4 - Validate

The Detailed Scheduling Function The problem On a short horizon (1 day to 1 month) We assume that the capacity of each work center is balanced with the work load generated by the work orders We have the list of work orders to be manufactured and the description of the operations to be performed Work Centers Standard Times Due dates

Detailed Scheduling Objectives Prepare a realistic work plan Manage the priorities for executing the work orders In order to Provide the workshops a detailed planning of the work to be performed on each machine

Possible objectives Meet the due dates for each work order Additional objectives: Maximize capacity machine utilization (specially for bottleneck work centers) Minimize WIP value (financial objective) Maintain some flexibility (commercial objective) Multiples objectives and partially contradictory

Detailed Scheduling Methods Scheduling Work Order per Work Order Forward scheduling Backward scheduling Choice of the loading priority Scheduling by sequencing rules Choice of a priority rule Scheduling without Work orders (kanban)

Scheduling per work order Centralized system Work of the machine Gantt chart Forward or backward loading Work order per work order (all the operations of a work order are loaded at one time) The results depends on the priority of work orders Becomes wrong if real work differs from planned work due to unexpected event

Scheduling a work order Operations Op. 030 Machine 1 Op. 020 Op. 040 Machine 2 Op. 010 Machine 3 time

Preparing the machine schedules Access: Scheduling menu, Finite Capacity Scheduling option 3 - Validate 1 - Select a scheduling end date 2 - Select ‘ Prepare Schedule ’

The Scheduling board Access: Scheduling menu, Scheduling Charts option

Scheduling one Work Order Select the work order Launch scheduling Operation are scheduled

Forward Scheduling Principle: Characteristics: Operations are placed in the routing order One operation is placed as soon as a free time slot with a duration equal to or greater than the operation duration is found Characteristics: Schedule can be accomplished even if due date is missed Increases short term capacity utilization Often causes buildup of WIP Not very flexible (urgent sales order, breakdowns)

Forward scheduled work order

Backward scheduling Principle: Begins with the due date of the final operation Schedules jobs in reverse order One operation is placed as soon as a free time slot with a duration equal to or greater than the operation duration is found Characteristics: Keeps free time in the short term Minimizes WIP A schedule is not always possible

Backward scheduled work order Scheduling starts at the Due Date Select Scheduling Backward

Forward scheduling of all work orders Access: Scheduling menu, Finite Capacity Scheduling option 1- Select Forward Scheduling 2- Select the scheduling order of the WOs

The machine schedule

The work order schedule

Work Order Due Date Analysis Access: Scheduling menu, Work Order Due Date Analysis option

Backward scheduling of all work orders 1- Select Backward Scheduling 2- Select the scheduling order of the WOs

The machine schedule

The work order schedule

Work Order Due Date Analysis Access: Scheduling menu, Work Order Due Date Analysis option

Priority scheduling of all work orders 2- Select the Priority Rule 1- Select Priority Scheduling

The machine schedule

Resource Capacity Utilization Access: Scheduling menu, Resource Capacity Utilization option

End of session 8