Subject:
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Re: Goodbye splines. (Re: Looking for 16 tooth clutch gear and arms)
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 30 Jan 2001 18:21:58 GMT
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Viewed:
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947 times
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In lugnet.technic, Amnon Silverstein wrote:
> It looks
> like they want to replace beams/plates with the new studless rounded liftarm
> types. I have mountains of these, and I can hardly ever think of a way to
> use them, and I can't guess why Lego thinks they are an improvement.
I'd guess the studless beams are cheaper to produce. The technic bricks
look like they require a more complicated mold, because the pieces have
cavities on all four sides: the open studs on top, the hollow underside,
and the holes through the brick. I don't know hardly anything about
molding, but I do know that you've got to be able to get the part out of
the mold after the plastic has set. For simple pieces, you only need
two-part molds. With inclusions on all sides, you need more pieces--at
least three, probably four (because the horizontal holes have larger
rim-holes on both sides, so different mold-parts are needed for each side).
For the studless beams, you'd only need two-piece molds. Simpler and
cheaper.
Plus, I'm guessing that making working studded connections requires finer
tolerances in manufacturing than pegged connections. Studs are only held
in place by flat-surface friction. Pegs have lips, so pegs 'click' into
pegholes.
Steve
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