Takt is the German word for the beat or tempo of the music for an orchestra. In lean it is the tempo of the production to match the customer demand for a product. It is also called the heartbeat of the process.
Calculating Takt Time
In its simplest calculation, takt time is defined by:
- D: Average daily costumer demand.
- W: Average daily available working time.
- T: Takt Time
T = W / D
The simple way to define average daily available working time is to take the total shift time, and then subtract breaks and meetings.
Let’s look at below example.
- The weekly demand is 200 mobile phones a week.
- We work 5 days a week with 8 hour (480 min) a day.
- Each day there is a 30 min launch break.
The average daily costumer demand can now be calculated.
- D = 200 units / 5 days = 40 units a day
Then the average daily available working time can be calculated
- W = 480 min – 30 min = 450 min
Now the takt time is calculated
- T = 450 / 40 = 11.25 min
This means that when running production, we have to produce one mobile phone every 11.25 min or 675 sec.
The above calculation was very simple, but it does not take any issues or unscheduled downtime into account. This also means, that if above takt time of 675 sec is used, you will either be short of products or need to use overtime in case an issue arise.
Also if you expect worker to spend time on continuous improvements as well, then this need to be included in the calculation.
Benefits of Takt Time
- Makes capacity calculations easy, as you quickly can determine what each process needs to be capable to deliver.
- Find out at what speed machines need to run.
- Find the optimal amount of people needed
- You easily spot problems with meeting the needed output.
Takt Time is one of the lean tools, if you found it interesting then our 5S Training might be of interest to you. It is usually the first step to take when starting out with lean, as it creates the foundation for further improvements to be implemented.
Alternatively you can continue to our Quality Training page to see some of the other types of training we provide.Go to Quality Training