Pull systems like kanban and reorder point are a cornerstone of inventory management and fluctuation reduction in lean manufacturing. The production is managed based on ACTUAL consumption. Theoretically, it is also possible to include expected but not yet actual consumption. In this post, I will explain to you the concept behind it and why I think it is a bad idea…
Inventory
How IKEA Uses Drones for Inventory Management
In my last post I went a bit into the theory of where drones in manufacturing may be applicable. They are not really for transport, but there is a possibility to use drones to gather data – provided you don’t need an expensive pilot and there are preferably no workers around on which a drone could crash. In this post I would like to show you the use of drones at IKEA. This is pretty much the only case I know that is not a mere trial, test, showcase, or example, but an actual beneficial implementation that receives a wide roll-out, with dozens of warehouses and stores either already having drones or planned to receive drones soon. Many thanks to Omid Maghazei for the information and details, see source below.
Drones in Manufacturing
A discussion of fancy new technology would be incomplete without mentioning drones. A simple Google search for “drone and manufacturing” returns around 72 million results. There is definitely a lot of buzz on drones and manufacturing. However, you probably have not yet seen a drone in manufacturing. This is because there are indeed very few cases of drones in manufacturing, and most of them are trial runs that never make it into regular production. Let’s have a look at what this is all about!
Relation between Quantity and Cost in Manufacturing
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.
Calculating the Number of POLCA Cards
In my previous posts I explained how POLCA works and discussed the pros and cons of POLCA. In this post I will explain how to calculate the number of POLCA cards. While POLCA is overall a feasible method, I do have some critical comments on the method to calculate the number of POLCA cards.
Advantages and Disadvantages of POLCA
In my previous post I described how POLCA (Paired-Cell Overlapping Loops of Cards) is supposed to work. Now let me look at the advantages and disadvantages of the method. Overall POLCA is a valid method of managing job shops. If it is the right one for you depends very much on your production system.
What Is POLCA?
POLCA stands for Paired-Cell Overlapping Loops of Cards with Authorization and was developed by Rajan Suri around 1990. It is sometimes mentioned alongside kanban and CONWIP as a production control system. Let me explain to you how POLCA works. In my next post I look at the pros and cons of POLCA. In my last post of this mini-series, I will show you the calculation for the number of POLCA cards, including some critical comments.
The similar-sounding word Polka is also a Czech dance music and textile pattern, hence the colorful illustration of the polka dots on the left (don’t worry, more technical diagrams will follow below).
How to Deal With Long Delivery Times
Lean has a bunch of advanced but good tools for material delivery, like Just in Time, Just in Sequence, and Ship to Line. Using them is much easier on short distances and with short delivery times. Yet, sometimes you just don’t have the option of short delivery times. This blog post deals with the issues related to long lead times and delivery times.