What is the projected order demand for one year? What are the estimated cycle times? The first step in designing a new system is to assemble the goals for the system.
Horizon For Project Study Card
The horizon is the time period to study. When designing a new system or investigating large changes to an existing system, we suggest you study an entire year. The danger to studying a shorter time period is seasonal or other variations in demand; you might optimize the system for the order mix you see in a specific month but the system performs poorly with part demand seen in other months. If you are confident that your part mix is consistent, you can study a shorter period.
Production Demand Card
Parts are the main driver of SeedTactic: Planning. A part is an entity that moves through a sequence of steps to be produced. Typically, a part will correspond to a physical piece of material that is manufactured. The Production Demand card allows you to add new parts, delete parts, and set the part quantity. The quantity is the number of parts that should be produced during the horizon specified in the Horizon For Project Study card.
A workcenter is a place where parts dwell for a period of time. Parts are manufactured by visiting workcenters in sequence, and can visit a workcenter more than once or skip over a workcenter. Each workcenter can either require labor or run unattended. If you have a workcenter which requires labor for a portion of the operation (such as loading or unloading), we have found it works much better to separate this into separate conceptual workcenters. For example, a typical machine-tool production sequence is a LoadUnload workcenter which requires labor, a Machining workcenter which can run unattended, and finally a return to the LoadUnload workcenter. Even if on the factory floor the operator stands at the machine to load the part into and out of the machine, by modeling them as separate workcenters in the project it is easier to study the utilization and demand for labor.
- To add a workcenter step, click the plus icon under the text "Parts flow through the following sequence".
- The card for each step in the sequence can be expanded or closed by clicking on the header.
- Each step requires a workcenter. The workcenter textbox inside the step can be used to either create a new workcenter or select an existing workcenter.
- The workcenter can either require labor for the entire operation, or not require labor at all.
Part Flow Card
To manufacture a part, it flows through the sequence of workcenters specified above and dwells for some amount of time at each workcenter. The Part Flow card specifies the time in minutes that a part dwells at each step, where steps are organized from left to right as columns. If an entry is left blank, the part will skip that workcenter.
Sometimes, a part must pass through the workcenters multiple times (for example, it must be sent into the machine multiple times because it must be clamped in multiple ways). In SeedTactis, this is modeled using sequences. A sequence is a single pass through all workcenters. To produce a single part, it will must visit all workcenters in the first sequence, then visit all workcenters in the second sequence, and so on.
- To add a sequence, click the three vertical dots on the right of a part row to open a menu.
- To remove a sequence, also click on the three vertical dots on the right of a part row to open a menu.