Production
scheduling in high-mix,
low-volume (HMLV)
job shops is tough due to all or some of the following reasons:
- Job have different routings, process time requirements,
priorities and due dates
- Make-to-order rule is necessary for a majority of jobs
- Final goods inventory is not to be maintained
- Customer want changes in the existing sales orders
- Hot jobs are accepted for large margins
- Job priorities change due to customer requirements
- Machines are multi-functional
- Workers are multi-skilled
- Machines breakdown and workers are absent sometimes
- Alternative resources are available for operations
- Bottlenecks keep changing over time
- Setup time on some machines is sequence-dependent
- Long operations need to be continued over many shifts with
different workers in different shifts
- Some operations of a job can run in parallel (with or without
time lag) if resources are available
- The total quantity of a job may be distributed to two or more
similar resources at a work center
- Workflow of a job may resemble project workflow
- An operation may simultaneously require multiple resources
(like machines and workers)
- Vendor (external) operations must be included in production
schedule
- Actual hours of an operation may differ from the estimated
hours to some extent
- Lead times are long and / or uncertain for some materials.
Schedlyzer efficiently addresses all the above issues in job shop
scheduling while the lighter version, Schedlyzer Lite
addresses the same except sequence-dependent setup times.
See
our approach to
scheduling.
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