assume that the last worker a firm hired produces 60

ASSUME THAT THE LAST WORKER A FIRM HIRED PRODUCES 60 MANUAL

For the sake of a simple discussion, let’s assume a single 8 hour shift on a 5 day work week. So let’s review and example of what we have really done here. (Maybe because that is the way Shingijutsu teaches it, and people tend to accept what Shingijutsu says at face value.)

But people tend to get wrapped up around what constitutes “available time.” The “pure” definition is usually to take the total shift time(s) and subtract breaks, meetings, and other administrative non-working time. The classic calculation for takt time is:Īvailable Minutes for Production / Required Units of Production = Takt Time But the main thing is to be conscious that this can be a major source of confusion until you are certain you and the other person are on the same wavelength. Therefore, it is critically important to establish context when you are talking. Adjectives like “operator cycle time” help. The source of confusion is when the users have not first been clear on their context.

ASSUME THAT THE LAST WORKER A FIRM HIRED PRODUCES 60 MANUAL

“Cycle time” is used to express the total manual work involved in a process, or part of a process.Īnd, of course, “cycle time” is used to express the work cycle of a single person, not including end-of-cycle wait time. We also have machine cycle time, which is the start-to-start time of a machine and is used to balance to a manual work cycle and, in conjunction with the batch size, is a measure of its theoretical capacity. In early publications about the TPS, such as Suzaki’s New Manufacturing Challange and Hirano’s JIT Implementation Manual, the term “cycle time” is used to represent what, today, we call “takt time.” Just to confuse things more, “cycle time” is also used to represent the actual work cycle which may, or may not, be balanced to the takt time. The value stream mapping in Learning to See calls this “production lead time” but some people call the same thing “cycle time.” It can also express the dock-to-dock flow time of the entire process, or some other linear segment of the flow. This definition actually pre-dates most of the English publications about the Toyota Production System. This definition can be used externally, or with internal customers. “Cycle time” can mean the total elapsed time between when a customer places an order and when he receives it. I see two fundamental sources of confusion, and I would like to clarify each here.

This is one of the fundamentals I’d have thought was well understood out there, along with some nuances, but I was quite surprised by the number (and “quality”) of misconceptions posted by people with “lean” and “Sigma” in their job titles. There has been an interesting discussion thread on “Kaizen (Continuous Improvement) Experts” group on LinkedIn over the last few weeks on the differences between takt time and cycle time.

Assume that the last worker a firm hired produces 60