Subject:
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Re: Very loose tolerances in the manufacture of LEGO bricks?
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Newsgroups:
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lugnet.lego.direct
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Date:
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Sun, 10 Jun 2001 20:21:32 GMT
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Viewed:
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485 times
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In lugnet.lego.direct, Kyle D. Jackson writes:
> I can't get into the Web Club to read this (because my userid has
> been nuked for some reason) so I don't know the context. But as
> Jake McKee has already posted, this would be thousandths of a
> millimetre (1/1000 or 0.001 mm). For you non-metric people
> this is 0.0004 in.
>
> Having said that I find it highly unlikely that LEGO is generally
> holding those kinds of dimensional tolerances on their plastic
> elements. And attempting to hold it would be silly. Even on
> non-plastic parts I would doubt they are holding much tighter
> than 0.01 mm (0.004 in). And by just looking at their pieces
> now, I can certainly say they sometimes have trouble hitting inside
> of 0.1 mm (0.04 in).
Except in rare cases, the tool has to be a tighter tolerance than the product.
I have no trouble whatsoever imagining (read that as speculating please!)
that the tolerances on the molds are at .001 mm and that due to non uniform
cooling, differences in runs of ABS beads, etc.... the bricks the molds
produce come out with the tolerances in their dimensions you describe (.1 mm).
Hope that helps.
++Lar
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