1. cycle time
■ タクトタイム is used in a variety of ways related to "cycle time" or other measures of processing speeds.
□ For a phrase born of the ultraefficient, "foolproof" world of the Toyota Production System (TPS), タクトタイム certainly seems to involve considerable confusion and misunderstanding. It is perhaps useful to divide its range of meanings into two areas. The first area is the range of meanings it carries without direct relation to TPS. The second area (definition 2) includes meanings directly related to TPS and the studies of manufacturing systems influenced by TPS.
The exact origin of the phrase is still debated, but there are some points that seem to be indisputable.
Reduce production timeShingo's use of quotation marks here seems to hint at the tenuousness of using "tact time" in English.
Employ layout improvements and the full work control system - alter layout so little or no transport has to be done between processes; the plant is laid out in a single process line Synchronize operations and absorb deviations - workers assist each other when one slows down, so that inventories don't back up between operations; processes are synchronized to flow directly from one to the next without delay.
Establish "tact" time - the exact time required to process one piece of product.
◇ Examples can be found in a diverse range of products, from automobiles and LCD testing equipment to textile machines and automatic cheese dispensers for pizzas.
タクトタイム：（除，検査・セット取り出し作業時間）; 15 sec/un
(From the specifications for a "Flat Board Probe")
(From the specifications for an inspection system)
Higher speed feed is possible than that of Cartesian Coordinate robot. The commands such as "Arch motion", "Auto-acceleration" makes the cycle time flexible.
(Corresponding Japanese and English web pages for an industrial robot. Note that タクトタイム is translated as "cycle time" here.)
(Here its usage seems closer to "processing speed.")
(Here it is used with サイクルタイム "cycle time.")
2. takt time
■ When used in English, "takt time" refers directly to its original usage in TPS and to the theories and practices that have been influenced by TPS.
◇ - Takt-Time, takt time is equal to the net operating time divided by customer requirements.
(The above definition is from this website of Frederick Stimson Harriman, a specialist in lean production [Toyota Production System] and a translator/interpreter who specializes in this field.)
The end result will be a production system that has integrated fabrication and machining operations into production cells that feed the final assembly line, all producing to the rate of customer demand, referred to as takt time.
(From a US firm of "Lean Manufacturing Experts")
Linck, J., Cochran, D. S., "The Importance of Takt Time for Manufacturing System Design," 1999 SAE International Automotive Manufacturing Conference, May 11-13, 1999, Detroit, U.S.A.
Lean production has greatly influenced the way manufacturing systems should be designed. One important aspect of lean production is takt time. Takt time relates customer demand to available production time and is used to pace the production. This paper applies the manufacturing system design and deployment framework to describe the impact of takt time on both the design and the operation of a manufacturing system.
(From a list of conference presentations)
This entry was created by Kevin Kirton..
Created 2000-12-12. Revised by KK 2000-12-15