Friday, November 13, 2009

Introducing Takt Time, Cycle Time and Lead Time

Takt Time
Based on the German word that indicates pace, the rate or pace of production as matched to the pace of customer sales. Used in lean manufacturing to align production time in linked manufacturing processes. Takt time represents the customer demand rate and is used to synchronize the rate of production with the rate of sales.
Numerically it is the daily production number required to meet orders in hand divided into the number of working hours in the day. For example, if customers demand 240 pcs per day and the factory operates 480 minutes per day, Takt Time is two minutes (480/240).
There are 2 type of Takt Time : Part and Line. The explanation above belong to Part Takt Time.
Whereas Line Takt Time is average rate of a line to produce a piece of part in working hours in the day. For example, if a line produces two type of parts, part A 200 pcs per day and part B 120 pcs per day and the Line operates 480 minutes per day, Line Takt Time is 1.5 minutes, comes from 480 divided by 320 (200+120).

Cycle Time
In short term, the time that elapses from the beginning to the end of a process to make a piece of part. In other definition, Cycle time is the total time from the beginning to the end of your process, as defined by you and your customer. Cycle time includes process (machine) time, manual work, walk, during which a unit is acted upon to bring it closer to an output, and delay time, during which a unit of work is spent waiting to take the next action.

Lead Time
The total time needed for an order to be processed and delivered. There are 4 kinds 0f Lead time: Information, Conveyance, Process and Store.
  1. Information Lead time is the total of time of information movements, start from order from customer to production order.

  2. Conveyance Lead time is the total of time of part movements, start from raw material, process to arrival at customer warehouse.

  3. Process Lead time is the total of part processes

  4. Store Lead time is the total of time of part stagnation in all stations such as WIP store, Finished Goods store, etc



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