Enter customer demand and other facility data on the Map task pane to calculate takt time.
Takt Time = Total Production Time Available / Demand
A furniture manufacturer has three 8-hour shifts. Each shift takes 30 minutes for lunch and has two 10-minute breaks for a total of 50 minutes, or 0.8 hours per shift. The customer demand is for 75 pieces per day.
The cycle time of a process step is the time from one completed output to the next completed output. You can enter the cycle time values in the Process task pane. You can enter Cycle Time or VA CT (value added cycle time) and NVA CT (non-value added cycle time). If you enter all three values, Workspace displays either Cycle Time or the sum of VA CT and NVA CT, whichever value is greater, on the top of the trough. VA CT is always displayed on the bottom of the trough.
If cycle time is less than or equal to 2 minutes, it is displayed in seconds on the timeline. If cycle time is less than or equal to 2 hours, it is displayed in minutes on the timeline.
If you enter VA CT and NVA CT on a process shape, cycle time is calculated on the timeline, but it is not calculated in the task pane.
The Line Balancing - VSM and the Value Stream Map Comparison forms do not use cycle time values from the timeline. If you plan to use these forms, you must enter cycle time values in the task pane.
Finished goods inventory time always uses the takt time equation. In the cycle time equation, use the following information.
If you want to override calculated inventory time to use a known value, you must add the optional field, Inv Time to the value stream map task pane. For instructions on how to add data fields to the value stream map task pane, go to Manage data fields from the task pane.
When parallel shapes are on the timeline, Workspace displays the highest value on the timeline, then uses that value to calculate total cycle time and/or lead time in the summary box.
You can include the following calculated data fields to timeline summary box by adding them to the Map task pane. For information about adding data fields to the task pane, go to Manage data fields from the task pane.
Lead Time – (Finished Goods Inventory Time + Raw Materials Inventory Time)