We Poka-yoke because failure is not an option
We Poka-yoke because failure is
not an option
To failsafe is to prevent mistakes turning into defects by implementing measures and limits into processes and procedures. The concept was formalised by Toyota in Japan to ‘Poka-yoke’ which literally translated as ‘failsafing’ or ‘mistake-proofing’.
Chelton prides itself on its low field failure rate and its reputation as one of the leading avionics manufacturer for quality and impressive Mean Time between Failure (MTBF) stats. Continuous improvement and striving for perfection is in our blood which is why we design and build failsafe technology. You may just see ‘failsafe’ as a buzzword; empty business jargon or marketing lingo which in reality means nothing. But this is not the case with Chelton, we poka-yoke because failure is not an option.
We caught up with our Head of Manufacturing and Engineering Operations, Neil Kanagaratnam, to take apart what ‘failsafe’ really means for Chelton and how our processes ensure only the highest quality products are sent to our customers.
Chelton: Can you explain what failsafing means to our engineers and designers and what you instil in them?
Chelton: What are some of the processes you are introducing and how will they achieve their ‘failsafe’ status?
Neil: We are implementing five major processes that will ensure the long-lasting performance of our products.
Zero Defect Plan (ZDP):Â
A well-established process in Quality Management where we ensure, through our process, we ‘do it right the first time’ avoiding waste and costly and time-consuming fixes later on in the process. This way, nothing falls through the net.
Automated Inspection (AOI):
To inspect components for faults and categorise them. We have transformed this capability from less of a monitoring tool to more of a process improvement practice by integrating it into our robot arms, Samson and Delilah. These state-of the-art robots have the ability to make decisions on components based on a limits from Sensor Technologies. Anything which is not deemed as a ‘Pass’ based on the criteria the robot sets from data we provide, will fail and will be rejected from proceeding. This way we are minimising the number of wastage later on in the process through early intervention. This will initially be used for larger platforms we provide equipment to but is a procedure we will implement across the whole portfolio in the future.
Digital Twin:
Imagine if you could load yourself into a digital version and simulate different scenarios you could go through to achieve a task. This could be anything from understanding how you would cope flying a supersonic jet to the edge of space or how you would cope in different stress situations. You would essentially be creating a digital twin of yourself and that’s what we do at Chelton. From the very beginning, we design and create a digital version of a product and simulate different manufacturing scenarios which bring the product to life but without the wastage of having to build and manufacture a product before knowing whether it would perform as expected. It hugely mitigates error risks and controls the whole processes throughout the final lifecycle so, again, nothing falls through the net.
3D Model Base work instruction:
Don’t you just hate it when you buy a piece of furniture and all of the instructions are in different parts or booklets? It leaves a lot of room for error and you’ll just end up with a wonky and faulty wardrobe at the end of the day! 3D Model Basing is a new technique we are introducing which provides all the steps for build in one, standardised and visual location. The right instructions are all available in one place meaning anyone can build parts easily. This simplifies the entire process, reduces cycle times and reduces wastage.
Six Sigma:
Process Improvement is key to failsafe technology and we are driving new developments with the implementation of Six Sigma practices. We do this by embedding people highly skilled in statistical process into the team which allows us to design and develop our products based on unquestionable, tangible statistical information. With this, we are automatically reducing the error rate and making sure the process is repeatable with the same result each time.
Chelton: Your design process seem very robust, is there anything else you do with the scrap and rework waste after it is rejected?
Could you elaborate on how the failure rate of a product or part are calculated and why customers should be assured that we are failsafe?
Neil: As with many in our industry, we measure failure through Mean Time between Failure (MTBF) rates which is the average time between system breakdown and maintenance. Our MTBF rates are intimidating to compare against other competitors because our field failure rates are so low and more often than not, it can be attributed to misuse of our system rather than the functional integrity because of all the fail-safe processes we have in place. The only challenge we face is with the internal failure rate because we are screening so much and to such a stringent point to make sure only the best goes to our customer. But the ZDP will lower this moving forward.
