Calculating station work content and remaining time

When you use a production program, operations may or may not have variants assigned to them. Process Planning for BTO/BTS/CTO calculates station work content and remaining time differently, depending on whether variants are assigned to an operation.

With variants

For an operation with variants, the active mode for calculating work content determines the operation time that displays in line balancing.

Process Planning for BTO/BTS/CTO uses two methods to calculate work content and time with variants:

• Average work content mode (default)—uses probability to weight the operation time, which then weights the station work content.

• Minimum and maximum work content mode—uses only the worst and best case variants of a particular station to calculate the work content.

Note

Probability is used only in conjunction with variants. See the Teamcenter Manufacturing Process Planner documentation for a description of variants and their effect on line balancing.

Without variants

Allocated time is how long it takes to complete a specific operation assigned to a process.

Station work content is the sum of allocated time for all operations assigned to a station.

Operation name	Allocated time
Obtain seat	17
Install seat	15
Secure seat	10
Station work content (total time)	42

Takt time is the time allocated to the station. It represents how long the product being manufactured remains within the station. On a moving line, the takt time is controlled by the speed of the line, the length of the station, and the distance between products being manufactured on the line (also known as the pitch).

The station remaining time represents the total time a station is idle of work, and is calculated using this equation:

Station remaining time = (station takt time) - (station work content)

Note

After operations are allocated, you can compare the workload of each station to balance the load between them. Your aim is to create a balanced line where the remaining time value for each station equals zero, meaning each station is occupied 100% of the time.