All entries for Tuesday 23 November 2010

November 23, 2010

Cp will tell you the truth

After our airplane exercise it turned out that both our groups had the same 6 sigma factors butt our performances, savings and approaches were totally different! This meant that 6S factor is very vauge and can be misleading.

It's much better to have a look at Cp and Cpk. What's more we had an interesting situation that our process from Monday (which was totally underperforming) had a better Cp than improved process (which saved around 40k!).
Greame suggested that it might be because on Monday we had simpler tasks and had less time for i.e. mistakes, losing screws and the variation was smaller. And today we had lots of tasks and at least once sth went wrong shifting up the variation.
What I suggested as well is that on Monday the variation was smaller becasue we were operating all the time pretty much similarily - unfortunately way above the limit!! So despite learing the tasks we were hitting say ~4 minutes all the time, regardless our actions = variation showed it's consistent action. However, today we were rushing to meet the goal (which was not wrong at all, we weren't complaining about it and forced to do that maybe because we believed it's achievable) and we were better and better (on target to be honest) but it didn't work this way all the time - so I guess variation showed that to a greater extent... I can't prove it but that's my sense of this case and at least hope you can understand my way of thinking.

'thinking does not hurt'

To make it clear, the title of this entry is a rough translation of a Polish proverb. It came to my mind today after classes.
I was an operator like yesterday and I had 5 operations (10 tasks) today and struggled with 6 of them very much!! I'm pretty stubborn (what equals stupidity, as it'll turn out soon) and only that made me go down from ~320 sec to 200 sec - our target for each operator.
After a while we had some time for improvements. I had no ideas for my tasks until I turned around a bolt and the nut was on the other side of the wings. Now its effect turned out to be almost a miracle for me! Instead of holding 3 nuts inside one bracket, I had them more outwards and it saved me some time (though I still had to learn and it was not perfect all the time). Much of the waiting was still because of me but it could've been worse... :P

So in the end I was amazed that I could change the process so much, but on the other hand I was frustrated that it took me so much time to realize that.... All because I was too stubborn (oh this bloody Polish mentality heh) and 'comfortable' with the process but it was the CHANGE that happened to be a salvation for me today and I'm glad I went for it.
To conclude with, thinking did not hurt me but it needs time to develop an idea (which I wish was much faster :P).

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