Subject:
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Re: Remaining parts
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Fri, 12 Jan 2001 15:16:23 GMT
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Viewed:
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253 times
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In lugnet.off-topic.geek, Jeff Shiner writes:
> - SNIP -
> >
> > Assume the accuracy of your scale is +- 2 grams.
> > Assume the weight of a 1x1 round plate is 2 grams.
> > Take a bag which is supposed to have 10 1x1 round plates in it.
> >
> > If when weighed, it weighs 20 grams, the actual weight could be 18 grams
> > (only 9 plates) or 22 grams (11 plates). Now we want to guarantee that
> > there are 10 plates, but when our scale measures 20 grams, there might
> > actually only be 9 plates. So we re-program the packing machine to put
> > 11 plates in. Now the expected weight is 22 grams, and if for some
> > reason a plate was missing, the bag would actually weigh 20 grams, but
> > the scale might still report it as 22 grams, which passes, but we're ok,
> > because it does indeed have the required 10 plates.
>
>
> I'm not sure how this would explain kits whose bags are mixed pieces as
> almost all are. The scale may indicate that a piece is missing but clearly
> could not indicate which piece. Am I missing something?
Yes. The thing you're missing is that pieces rarely are missing. The scale
is there as a check. Further, the bag is weighed after every insertion step,
or so the stuff we've read seems to imply. As soon as a problem is noted,
it's time to bring in maintenance to see why the machine isn't working
right. Knowing exactly what the problem is certainly helpful, but knowing
there IS a problem is 97% of the battle with automation.
Especially unattended automation, as is used in TLC plants. (I was looking
through the DK book again, and they have a picture of a molding hall,
hundreds of machines, not a soul in it. Bagging is not molding, of course...)
++Lar
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Message has 1 Reply:
 | | Re: Remaining parts
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| (...) I actually left out some other possibilities for small error. The weight of the bag itself is certainly an opportunity for error. Another opportunity of course is if any foreign material or scrap gets into a bag or on the scale. Of course this (...) (24 years ago, 12-Jan-01, to lugnet.off-topic.geek)
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Message is in Reply To:
| | Re: Remaining parts
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| - SNIP - (...) I'm not sure how this would explain kits whose bags are mixed pieces as almost all are. The scale may indicate that a piece is missing but clearly could not indicate which piece. Am I missing something? - Jeff (24 years ago, 12-Jan-01, to lugnet.off-topic.geek)
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