The time between parts should be based on two things: 1) The station or process with the highest workload (and of course, with line balancing, all stations should have a similar workload), and 2) the customer demand. Of course, once the line is set up, the speed and the time between parts are directly related. Therefore, it is often better to talk about the time between parts rather than the speed of the line. Hence, the actual line speed in meters per second also depends on the spacing of the parts. In the bottom line, however, the stations are much closer together, meaning that the workers have less space, but also that the overall floor space is better utilized. Overall, the speed of the workers is the same in both lines, as is the number of parts produced. On the other hand, the parts in the bottom line are much closer to each other than in the top line. The parts in the top line move faster than the parts in the bottom line. This is the time the station has to complete the part. Every how many seconds does a part enter the space of a station. The distance between parts is important here. However, when setting up a line, the speed is actually the time between one part and the next part. The speed is usually defined in meter (or feet) per second (or minute). Definition of SpeedĪt this time I have to be more precise in what I mean by speed.
Assembly line movie#
See Charlie Chaplin in the afternoon scene of his famous movie Modern Times on how NOT to do it ( Youtube link here, but copyright unclear).
In lean terms it would be one of the three evils in manufacturing: Muri, or overburden. They will hate the company, and quality will suffer. But seriously, don’t just increase the speed until the workers can no longer take it! This is really bad practice and will demotivate workers. Luckily, these times are long gone (I hope). Henry Ford and his managers, around 1920, simply kept on increasing the speed of the line until the workers were no longer physically able to keep up with the speed. Adjusting the speed of the line requires some thoughts. The speed is usually set through a central system. One very important aspect of the continuously moving line is the speed of the line. Let’s look into more detail in the set-up and operation of such a continuously moving line. They are, for example, very common for the final assembly of cars. These systems also have their advantages and disadvantages. This is usually an automatic transport system like a conveyor belt, a moving walkable platform, pulling by an underground chain, or moving hanging carriers, to name just a few. In the continuously moving line, the parts are – as the name says – continuously moving. Continuously Moving LineĬontinuously moving assembly line with hanging carriers In this type of line, the parts are always moving, and the processes and workers move along with the part until the process is completed. Another common way to structure the pacing of flow lines is the continuously moving line. In my last post I described the pacing of pulse and unstructured flow lines.
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