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20 Cards in this Set
- Front
- Back
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Importance of short term scheduling
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Faster movement of goods which means better use of assets and lower costs. This new capacity as a result of faster throughput. More dependent deliveries
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Scheduling criteria
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Minimize completion time, maximize utilization of facilities, minimize WIP, minimize customer waiting time
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Scheduling issues
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Deals with timing of operations, task is the allocation and prioritization of demand. For backwards scheduling, finite or infinite loading criteria for sequencing jobs
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Forward scheduling
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Start as soon as requirements are known, Produces a feasible schedule though due date may not be known. Results in buildup of WIP
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Backward scheduling
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Begins with today and schedules from final operation first. If we want to finish by a certain date when should we start. May not have the resources available
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Finite and infinite loading
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Signing jobs to workstations, finite loading assigns work up to the capacity of the workstation, All work it's done due dates any pushback. Infinite loading does not consider capacity, all due dates are met capacity maybe readjusted
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Process focus facilities or job shops
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Scheduling to customer orders, schedules are often due date focused
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Repetitive facilities or assembly lines
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Schedule module production and product assembly based on frequent forecast, finite loading with focus on generating for looking schedule. JIT techniques are used to schedule components that feed assembly-line
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Product focused facilities or continuous
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High-volume very limited variety. Finite loading with a focus on generating a forward-looking schedule that can meet unknown set up and run times for the limited range of products
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Scheduling process focused facility
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Scheduling coming orders without violating capacity constraints, check availability of tools materials, Established due dates for each job and check progress check WIP, provide feedback, provide work efficiency statistics and monitor times
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Planning profiles
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Required for both automated and manual short-term scheduling
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Planning files
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Item master file contains information about each component. Routing file indicates each components flowed through the workshop. Work Center masterfile contains information about the center
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Control files
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Tracking the actual progress made against the plan
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Loading job objectives
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Assigned jobs so that cause, idle time, or completion time are minimized
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Two forms of loading
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Capacity oriented and assigning specific jobs to work centers
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Input output control
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identifies overloading in under loading conditions, prompts managerial actions to resolve scheduling problems
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What is S PT and what are the good things and bad
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Shortest processing time first. Does well on minimizing full-time and number of jobs in the system. Moves long jobs to the End which made to satisfy customer
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FCFS problems
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Does not do well but it's perceived fair to customers
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EDD one is it and good feature
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Earliest due date first. Minimizes maximum lateness
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Critical ratio
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In next number from by dividing the time remaining until the due date by the work time remaining on the job. Low critical ratios are scheduled before high critical ratios
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