Subject:
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Re: Looking for dimensions of LEGO bricks.
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 27 May 2009 09:06:44 GMT
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Viewed:
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9539 times
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In lugnet.cad, Anders Isaksson wrote:
> I'm not at liberty to say too much, but I have actually looked at three real
> drawings of LEGO parts, and not even TLC seems to be sure what the
> dimensions should be - I've seen the distance between two studs dimensioned
> as 8 mm on one part and as 8.018 mm on another!
That much? Wow. I figured the distance between two studs should be closer to
3mm, since a LEGO tile is (in theory) 3.2mm thick, and it will sorta fit between
two studs. Or were you refering to the center-to-center distance?
Anyways, one thing you have to remember is that the dimensions on a LEGO brick
will be noticably different from the dimensions on a LEGO brick mold. Depending
on the specific shrinkage rate of LEGO-spec ABS, an 8.018 mold dimension could
result in a post-form LEGO brick with an ~8mm dimension. It's been a few years
since I actually had to know the shrink rate of ABS, but one of the sites I
pulled up on a quick search said it ranges from 0.0024in/in to 0.0165in/in.
Going with the former, an 8.018mm mold will produce a 7.9988mm part. The latter
would result in a 7.8879mm part.
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Message has 1 Reply:
 | | Re: Looking for dimensions of LEGO bricks.
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| (...) Center-to-center, of course. The stud diameters differ by 0.028 between the drawings too, creating a diff of the gaps of 0.046 (but the length of the parts are exactly the same). (...) Well, the drawings are of parts, not molds (and the parts (...) (15 years ago, 27-May-09, to lugnet.cad)
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Message is in Reply To:
| | Re: Looking for dimensions of LEGO bricks.
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| (...) I'm not at liberty to say too much, but I have actually looked at three real drawings of LEGO parts, and not even TLC seems to be sure what the dimensions should be - I've seen the distance between two studs dimensioned as 8 mm on one part and (...) (15 years ago, 26-May-09, to lugnet.cad)
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