Jan 14 2015
Not Exactly Poka-Yoke and Chaku-Chaku
An interesting video, but “Poka-Yoke” and “Chaku-Chaku” don’t mean what the narration says they do. And they are not “Japanese” methods but methods invented by specific individuals in specific companies that happened to be in Japan. Likewise, the assembly line is not an “American” method but a method invented by P.E. Martin, Charles Sorensen and others at Ford.
“Poka-Yoke” doesn’t just mean “correct.” More specifically, a Poka-Yoke is a device integrated in the production process to prevent human error or detect it immediately without adding any labor. Checking bar codes on parts, as shown in a video, doesn’t qualify as a Poka-Yoke because it adds labor, and error prevention devices that add labor are ineffective because they are by-passed under pressure.
The video shows an operator attending to a sequence of tasks and calls it “Chaku-Chaku.” There is, however, ,more to Chaku-Chaku than this, such as automatic processing at each station, with automatic unloading and chutes between stations, so that the work of the operator is focused on checking the part after an operation and loading it into the next.
See on Scoop.it – lean manufacturing
Nov 30 2015
What Poka-Yoke Are And Are Not, And How To Sustain Them
Chet Marchwinski recently exhumed a 2011 discussion about Poka-Yoke that had been started by the following question:
In short, I can think of two reasons for production supervisors to disconnect Poka-Yoke:
The following paragraphs elaborate on these points.
By Michel Baudin • Technology • 3 • Tags: Mistake-Proofing, Poka-Yoke, Quality, Quality Assurance, Usability Engineering, Work instructions