• Even if converting severity into a scale will not make it a continuous data. or will it? 3 weeks, 4 days ago

  • @jazzchuck “It all comes down to getting information out of the data. The more resolution, the more information you can get out if the data. A rating scale has more resolution than pass/fail data. Think of a case where you have a machine that is producing a part with a diameter out of spec, and you are tasked with adjusting the machine to get it…[Read more]

  • Thanks Chuck for your time :-)

    You are right that it is the severity which can drive the improvement in the process. But there are some limitations: To run any improvement one must have a reliable output’s data, as I understand. In this case, we only have visual judgement i.e. no reliable method or instrument to measure the severity. Even one…[Read more]

  • “There is only one kind of defect which is termed as “dark patch” and it does not matter if  a coil is 10% cleaned or 90% cleaned because it will be delivered to customers.  The defect is caused by improper degreasing which we all are aware of that. Then he came up with the idea that defect (ok/not ok) should be converted into a scale of 1-10.…[Read more]

  • I am really  thankful to your contribution. I mean it! 1 month ago

  • “I’m not sure where we’re going with this discussion.  The focus of your initial post was that of coil rejection due to defects.  In the follow up discussion I was left with the impression defect reduction and thus increased acceptance of coils was your main concern.  I was also left with the impression that one factor known be a contri…[Read more]

  • “Pareto chart the results to identify the most frequent reasons for rejection.  If all reasons for rejection are created equal then you could use that chart as a driver for examination of the process to find the cause(s) of the top two or three reasons for rejection.”

    In this case, the reason of rejection is only one problem which is caused by…[Read more]

  • Distocont changed their profile picture 1 month ago

  • Continuation…….

    Just recently I have proved with some experiments that it is the degreasing process i.e. ineffective degreasing causing dark patches on the wire’s surface. And in batch degreasing process (B equipment), parameters are: Temperature, degreasing agent, lubricant system and rinsing after degreasing. Before degreasing wire is drawn…[Read more]

  • Thanks @rbutler for you time :-)

    “What your post does suggest is you have some understanding of why coils are rejected.  For example, you mentioned dark surface on wire is cause for rejection….and what else?”

    In fact it is his department’s process where coils are wet-processed such as degreasing and then coils go for the inspection before de…[Read more]

  • Hi there,

    I am working in a manufacturing environment where we are producing wire coils. Every lot has different number of coils depending on the order of the customer and each coil has hundreds of spirals. Before delivery to the customer an inspection is being performed whether a coil is OK or Not OK. A coil which is defected may have defects…[Read more]