As you surely know, it is more efficient to produce larger quantities. This is the economy of scale. In a recent post I talked about the Power of Six, a rule of thumb for the relation between lead time and cost. In this post I will show you a rule of thumb for the relation between quantity and cost. Credit for this rule goes to Juan Carlos Viela.
Continue reading Relation between Quantity and Cost in Manufacturing
All posts by Christoph Roser
Maintaining Weak FIFO in Parallel FIFO Lanes
Sometimes you would like to put more material in a single FIFO lane than the space you have available. In this case you would have to use a combination of two or more parallel FIFO lanes. In my last post I described how to maintain a strict FIFO sequence in parallel lanes. This post looks at an easier but less accurate method. Continue reading Maintaining Weak FIFO in Parallel FIFO Lanes
Maintaining Strong FIFO in Parallel FIFO Lanes
FIFO lanes are a common and easy way to manage material flow. However, sometimes there is not enough space to make a long FIFO lane. In this case the FIFO lane is often split into multiple sub-segments. This post looks at how to maintain strict (or strong) FIFO in such parallel FIFO lanes. Continue reading Maintaining Strong FIFO in Parallel FIFO Lanes
The Power of Six: Time and Money for Parts of Your Value Stream
In my last post I presented you Rajan Suri’s Power of Six – the relation between turnaround time and product cost. In this post I extend his work to apply it to not the entire value stream but to segments of the value stream. Enjoy! Continue reading The Power of Six: Time and Money for Parts of Your Value Stream
The Power of Six: Relation between Time and Money in Manufacturing
Time is money. You know that. But with respect to product cost and lead time, there is a rule of thumb that estimates this relation. Let me present to you the “Power of Six,” discovered by Rajan Suri. This gives you a rough estimate of how the lead time of your products influences the cost and vice versa. This first post looks at the original work, and my next post applies this rule also to segments of the value stream. Continue reading The Power of Six: Relation between Time and Money in Manufacturing
150 Years after the Birth of Albert Kahn
Albert Kahn (1869–1942) is an often unknown but very influential figure in the history of manufacturing. An architect by trade, he revolutionized industrial architecture, and is often nicknamed the “Architect of Detroit.” Most modern factories have a design that goes back to his innovations. Since he was born exactly 150 years ago on March 21, 1869, it is a good time to look at his achievements. Continue reading 150 Years after the Birth of Albert Kahn
The Toyoda Model G Loom (with Videos)
Toyota Motor originated from the Toyoda loom factory, where Sakichi Toyoda invented looms. Probably the most famous one is the Toyoda Model G Automatic Loom. This loom touches on many points that are part of the Toyota Production System and lean manufacturing. During my last visit to Japan in September, I made some videos detailing many of the features of the Toyoda Automatic Loom from 1924. Be advised: Lots of images and videos ahead! Continue reading The Toyoda Model G Loom (with Videos)
Production Control with COBACABANA
The Copacabana is a very nice beach in Rio de Janeiro. Spelled slightly differently, COBACABANA is a production control approach. Here, COBACABANA stands for Control of Balance by Card Based Navigation (sometimes also abbreviated to COBA). It is an approach to manage a job-shop workload of custom orders using paper cards. A lot of paper cards, in fact, which also makes the method a bit complex, and I am doubtful if this method is practical. Let me show you how it works. Continue reading Production Control with COBACABANA