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Crossing conveyors

Nov 21 2013

Stop ropes and Andons at Ford’s River Rouge Plant in 1931

Mark Warren pointed out to me the description of a stop rope with and Andon board in a book called Ford Men and Methods, by Edwin P. Norwood, with illustrations by Charles Sheeler, including his famous crossing conveyors.

First, on p. 1:

“Placed on one of many balconies to be found in the Rouge Plant Motors Building is a room, glassed on three sides and so located as to command a comparatively clear view of all that surrounds it. Along the back wall of this room stands an instrument board, studded with signal lights.

Aside from their visitor, two men are present. One, seated on a stool, is drawn close to a shallow desk which extends from the board. The other, a trouble mechanic, is intent upon that constant motion to be seen through the windows.

As you watch there comes the whir of a bell fixed to the top of the panel. The man at the desk moves a switch. The bell is silenced but in the same instant a green light glows in the face of the board. The operator waits-one eye on a clock that is near the bell, the other on the emerald light.

Five seconds, ten seconds, twenty seconds–then the light goes dark. Already the man’s finger is on a convenient button. He presses it twice and to your ears come the drawn-out wails of a distant siren. He touches a second button and somewhere a conveyor, temporarily “down,” goes into action again. You have had a fleeting glimpse of one of the control centers of that huge System of power-driven carriers that move throughout seemingly every nook and corner of the Dearborn shops.”

Following is a picture of an Andon board from Toyota Georgetown today:

Andon board at Toyota Georgetown

Unlike the example described above, it is not located in a control room but on the shop floor for production supervisors to see, and green lights are not used for alarms anymore. Perhaps, in 1931, the green-yellow-red color code had not yet become a cultural constraint.

Then on p. 10:

“The operator is provided with the means of protecting himself against accident or the chance of becoming swamped by a too rapid flow of work. If materials are coming too
fast, as at some point where there is a transfer from one line to another, or if an unlooked-for hitch tangles the smoothness of movement, any Workman is at liberty to bring that line at which he is engaged to a halt. Indeed, he is expected to do so. He does this by throwing a switch, or by reaching upward and pulling a  cord which operates similarly to that used for signaling the driver in a motor bus.

To make clearer this provision it may be well to return to the control booth touched upon at the beginning of the present chapter. The glowing of the green light noted at that time simply meant that somewhere some operator or foreman had pulled a stop switch. The trouble determining this action may have been a minor difficulty, or it may have been of serious import — possibly an actual breakdown of machinery. In such instances the probability is judged by the booth operator in accordance with the space of time that the signal light burns. If more than two minutes pass, then the trouble mechanic serving the affected section investigates the cause. And he knows where to go because of the number and position of the light on the instrument board. But if the light is extinguished within the permitted two minutes, this is because an electrical impulse meaning ‘All’s well’ has been sent in from the point of temporary trouble. It is then that the siren is sounded –a warning to all interested that the line is once more to move — while the pushing of the second button sends the conveyor into action again. But whatever the space of time may have been, the control operator tabulates both it and the point of trouble.”

Operator pulling a stop rope at Toyota Georgetown
Operator pulling a stop rope at Toyota Georgetown

The description of the stop rope matches exactly this picture from Toyota Georgetown, and it still resembles the cord on a city bus that you pull to tell the driver to let you off at the next stop.

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By Michel Baudin • History • 2 • Tags: Andon, Ford, Sheeler

Nov 19 2013

Fundamentals of Performance Metrics | Bill Waddell

See on Scoop.it – lean manufacturing

Received a question the other day: “If you were allowed to use 3 metrics to operate by, what would they be (and why) if you were: (1) a CEO, (2) a Plant Manager, (3) a Value Stream Manager, (4) a Purchasing Manager, and (5) a Sales Manager.” In…

Michel Baudin‘s insight:

A thoughtful, rant-free article, focused primarily on the language of money. My few blog posts on the subject were on metrics in the language of things, as spoken on production shop floors:

  • Chart junk in performance boards and presentations 
  • Companies focus on what is easy to measure
  • Metrics in Lean recorded webinar
  • Alternatives to Rank-and-Yank in Evaluating People
  • Productivity of a Quality Assurance department
  • Lead times and inventory 
  • Metrics on the web versus manufacturing
  • Metrics gaming and how to prevent it 
  • Metrics of Equipment
  • Metrics of Quality
  • Requirements on Metrics
  • The staying power of bad metrics
  • Orbit charts, and why you should use them

See on www.idatix.com

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By Michel Baudin • Blog clippings • 0 • Tags: Lean, Metrics

Nov 15 2013

A pull system of 1915 | Charles E. Knoeppel

The following is from p.121 of Charles E. Knoeppel’s book Installing Efficiency Methods (1915):

Pull system C. Knoeppel 1915

Thanks again to Bryan Lund for pointing out this  forgotten but remarkable book.

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By Michel Baudin • History • 4 • Tags: Pull systems

Nov 11 2013

Giving Credit for Jidoka | Bill Waddell

See on Scoop.it – lean manufacturing
“…Automation has long been a central tenet of lean.  It is in the automation versus labor cost issue where conflict arises.  Toyota spends a lot of time thinking about and working on jidoka – automation with a human touch.  In a nutshell, it means investing in automation to enhance human capability, rather than replace it…”

 

 

Michel Baudin‘s insight:

One of the rare articles in English where Toyota’s jidoka is accurately portrayed as a complete — and effective — automation strategy, rather than reduced to the notion of machines that stop when they malfunction. As Bill recognizes, there is more to it than that.

See on www.idatix.com

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By Michel Baudin • Blog clippings • 0 • Tags: Automation, Autonomation, jidoka

Nov 8 2013

Demand/Capacity Curve | John Dyer | IndustryWeek

See on Scoop.it – lean manufacturing

“True company growth can be achieved when the maximum capacity is increased by breaking bottlenecks and the sales team makes promises to the customers that the business process can support.”

 

Michel Baudin‘s insight:

John Dyer presents the capacity of a business as a constraint set by the slowest operation in its process, also known as its bottleneck. In manufacturing, at least, it is more realistics to think of it as fuzzy.

If a solid line exists, we don’t usually know exactly where it is. Even an operations manager who claims to know it won’t share that information with colleagues.  Right after claiming in a meeting that production is running full blast, he or she miraculously finds a way to squeeze 15% more out of it.

If  a perceived bottleneck is a purely human process requiring no unusual skills, it can eliminated by rebalancing the work. Dyer’s discussion is centered on where it is a machine and its capacity can be increased by process improvement.

But does this mean that continuous improvement should be focused exclusively on the bottleneck? In many cases, the bottleneck is the most sophisticated machine on the floor, and increasing its capacity  requires engineering knowledge that is not present in the factory’s work force, and can only be done by bringing in outside experts.

On the other hand, the work force has the skills needed to improve the performance of other operations. This can ensure that the bottleneck has the materials it needs at all times, and free human resources that can be trained to operate and maintain the bottleneck, and eventually to improve it.

This article has a “Part 2” about  why it is so difficult to work with in-house suppliers . Dyer’s term for in-house suppliers is “intercompany suppliers,” which confused me, because I took “intercompany” to mean “between companies,” the way “international” means “between countries.”

His point is that in-house customers may be bad for a supplier because transfer prices calculated on a cost-plus basis can be below market prices. This causes in-house suppliers to give preferential treatment to their external customers.

A remedy that Dyer does not seem to consider is to make transfer prices between divisions match market prices. This works as long as the supplier division has external customers — or the customer division external suppliers —  through which market prices can be known.

In many cases, in-house suppliers make parts based on the company’s unique technology, that have no outside market, and for which there is no market price. Transfer prices then have to be negotiated in a way that is “fair” to both sides. Figuring out what that means is a conflictual process, that is avoided by treating the supplying division as a cost center rather than a profit-and-loss center.

See on www.industryweek.com

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By Michel Baudin • Press clippings • 0 • Tags: bottleneck, capacity, Continuous improvement, Supply chain

Nov 6 2013

Standards and Opportunities for Deviation

“Every time you set a standard, you create possibilities for deviations, and the need to respond,” David Meier said. The setting was a presentation on problem-solving at a corporate in-house conference. It struck me as a concise statement of why managers should issue standards only where clearly and unquestionably useful.

Unnecessary standards were discussed in an earlier post, but the topic is worth revisiting in greater detail, first because there are so many of them in companies, making work life more complex than it has to be, and second, to elaborate on their impact on the organization.

Standards are rules set for others to follow, and rarely welcome, particularly when these others are thereby  required to change behaviors they consider rational and appropriate, and sometimes more advanced than the standard. If you don’t enforce your unnecessary standard, your hurt the credibility of all your standards, including the useful ones; if you do, you turn into Captain Queeg, as he “tried to run the ship properly, by the book.”

All pens different
All pens different
All standard pens
All standard pens

The reception desk in the lobby of the building where the conference took place had a holder  full of pens for visitors to sign in. No two pens were alike. A Captain Queeg would have had none of that; he would have mandated a model of pen and a color of ink, and set  up regular audits to monitor compliance.

Office 5SThe example David gave was of office 5S zealots in Germany who had marked a location for a computer mouse on an individual’s desk and written him up for not complying. Last year, Mark Graban had posted a similar example of “5S” at a desk in the UK, shown on the right.

It reminded me of my experience of working in a Japanese office in the 1980s. It was a room with about 30 gray metal desks arranged in facing rows without any partitions. Everywhere else I have worked, each desk had its own supplies of staplers, staple-removers, scissors, glue sticks, etc., but it was not so in that office. These were shared resources, stored in a transparent plastic chest in the center of the room,  with a label for each compartment.

This arrangement sounds right out of a Staples commercial, but that was the way it was. What struck me about it,  however, was that the sharing created the need for labeled locations and for the discipline to return the items to assigned locations after use. This approach might make sense in offices used in hotelling mode. Everywhere else, however,  each office worker has a dedicated desk that comes with a set of  tools, that the employee organizes as he or she sees fit.

In the 21st century, the tidiness of desks does not have much to do with the performance of an office. What really makes a difference is the way information is organized on its computer network, and that is not visible when you walk through the office. But effective ways to do this are a whole other discussion. In factories, 5S in the offices is sometimes justified “to show solidarity with the shop floor.” It has been suggested to me that a better way to show solidarity might be to make the offices as hot, smelly and grimy as the shop floor.

Sometimes, the consulting companies that guide 5S implementation in client offices do not practice it in their own. In one particular firm, as consultants were in the field most of the time, they had no permanent desk, and grabbed an available one when they happened to be in town. With such a system, you might have expected the rooms to be numbered, and to have a magnetic board at the entrance with token for each present consultant to mark on a map of the facility where he or she could be found, but the managers felt that such a board would have been “ugly.” They never told me why they didn’t number the rooms. To locate a consultant you had to call his or her cell phone, and then follow instructions like “go left at the top of the stairs and it’s the third door to the right.”

Besides the size of steel balls at the end of motorcycle brake handles and company email addresses listed in my earlier post, there are many other things that are better off not standardized, and prominent ones include the analytical tools used in problem-solving.

The institutions of the quality profession in the US still promote as a standard the 80-year old tools of SPC, as if the art of collecting and analyzing data had not evolved since 1930. These tools are obsolete, but it would be a mistake to replace them with another set as a new standard.

There should be no standard. The professionals who work on improving quality should learn to use a broad variety of tools, and should be free to use whichever they think may help in their current circumstances. And they should always be on the lookout for new approaches and new technology.

Likewise, Value Stream Mapping (VSM) has, in the past 15 years, been elevated in the US to the position of a standard that all Lean practitioners are mandated to use. The need to map flows of materials and information in a manufacturing supply chain is often real, but there is no need for it to be done in a specific format with a specific set of symbols.

In fact, what happens in both situations is that formal compliance with the standard rapidly becomes the only criterion against which the outputs of quality or flow improvement teams are reviewed. The tools, their appropriate use, and their range of applicability are understood neither by the teams mandated to use them nor by the auditors who make sure they do, and the result is wallpaper.

 

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By Michel Baudin • Management • 2 • Tags: Captain Queeg, Quality, SPC, Standard Work, Standards, VSM

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