Subject:
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Re: LEGO meeting the engraver
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 10 May 2002 18:51:56 GMT
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Viewed:
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501 times
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In lugnet.trains, Steven Barile writes:
> www.brickshelf.com/cgi-bin/gallery.cgi?i=154085
This is really cool, Steve.
Milling grooves into the parts can get you designs that would be impossible
or at least costly to mold into the part.
Molding a texture on the side of a brick is expensive. It requires more
moving parts in the mold, in particular a "split cavity" that expands around
the part instead of just moving away, or the part will not be able to slip
out of the mold.
The great example is the 1x2 corrugated brick. If you look at one you will
see the evidence for the mold's parting line going up the end faces of the
brick. This implies that there are two halves of the mold which move away
from this line--a split cavity. Producing a plastic part on this method has
many drawbacks versus a part with smooth walls. And there's a reason why the
corrugated brick is smooth on the two ends.
There are a lot of other techniques that bear on this but I'll leave it at that.
(I don't have any HP sets so I can't look at the textured arch.)
-Erik
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Message has 1 Reply:
 | | Re: LEGO meeting the engraver
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| Erik, As someone with a little molding experience (sand casting for metal, and injection molding), I understand what you're saying. I thought for a while about how to do that, and you are right, you do need a moving cam inside the mold so the part (...) (22 years ago, 10-May-02, to lugnet.trains)
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Message is in Reply To:
| | LEGO meeting the engraver
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| Hi All, After long consideration I decided to mutilate bricks. I have resorted to only de-facing then so far. One might say its more like a 3D decal, others my scoff. This is what LEGO designers do, so why not. We have directly influenced them on (...) (22 years ago, 10-May-02, to lugnet.trains)
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