Subject:
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Re: Is this bad design?
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Newsgroups:
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lugnet.general
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Date:
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Fri, 16 Nov 2001 17:13:11 GMT
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Viewed:
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512 times
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I suspect it's due to the way that plastic parts are made. They have to
have a draft, or an angle on all vertical walls, in order for them to be
removed from the mold. Over small distances, or when reinforced in a 3-d
structure, this draft doesn't show up. However, when you build a long
distance in a straight line (as your bridge decks are), the small angles in
each vertical wall (it may be as small as 1/2 degree) will add up to cause
bowing in the overall structure.
But that's just a theory.
Adrian
--
www.brickfrenzy.com
In lugnet.general, Ross Crawford writes:
> Hi all,
>
> I've found the following interesting LEGO behaviour while working on the deck
> for my bridge. It consists of (many) plates held together on the bottom by
> technic beams. There's a picture of the construction here
> http://www.brickshelf.com/gallery/RoscoHead/coathanger/big3.jpg. As you can
> see, there's also small plates holding the technic bricks together. The result
> I'm getting is shown here
> http://www.brickshelf.com/gallery/RoscoHead/coathanger/big1.jpg and here
> http://www.brickshelf.com/gallery/RoscoHead/coathanger/big2.jpg. In just over a
> metre, the middle of the deck is raised about 1cm. In the context of the
> bridge, this is actually a bonus, however I see it as generally a "bad thing".
>
> And further to that problem, The side decks (which are only 4 studs wide) are
> exhibiting a horizontal version of the problem, see the pics at
> http://www.brickshelf.com/gallery/RoscoHead/coathanger/small1.jpg and
> http://www.brickshelf.com/gallery/RoscoHead/coathanger/small2.jpg. You can see,
> with the row of 1x6 plates next to the row of bricks, there is considerable
> horizontal curvature, in addition to the vertical curvature! And this is
> definitely bad for my bridge deck!
>
> Has anyone else experienced this?
>
> ROSCO
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Message has 2 Replies:
 | | Re: Is this bad design?
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| (...) Hmmmm. I would have though if that's the case, it's more likely the slope would be outwards toward the bottom of the plate / brick, causing the curvature to be the other way, ie sunken in the middle rather than raised. It also doesn't explain (...) (23 years ago, 16-Nov-01, to lugnet.general)
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Message is in Reply To:
| | Is this bad design?
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| Hi all, I've found the following interesting LEGO behaviour while working on the deck for my bridge. It consists of (many) plates held together on the bottom by technic beams. There's a picture of the construction here (URL) As you can see, there's (...) (23 years ago, 16-Nov-01, to lugnet.general)
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