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 20:51:18 GMT
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Viewed:
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486 times
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In lugnet.general, Adrian Drake writes:
> 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.
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 the horizontal "bending" - the plates on top actually
have small gaps between them - it seems that connecting them with a plate makes
that gap slightly larger than it is with a brick. Maybe it's just that the
studs on plates are slightly different from those on bricks?
ROSCO
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Message is in Reply To:
 | | Re: Is this bad design?
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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 (...) (23 years ago, 16-Nov-01, to lugnet.general)
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