Subject:
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Re: More studs in holes...
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Newsgroups:
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lugnet.build
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Date:
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Wed, 15 Dec 1999 18:31:58 GMT
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Viewed:
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773 times
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I think that the main reason that the studs fit tightly in the sides of the
technic beams is that there is no 'give' in the plastic that grips the stud,
as is there typically when they connect to the bottom of a brick, or a
plate,
or what have you.
In fact, if you take a cross axle, which spins very freely in the side-holes
of a technic beam (naturally), and plug it into the bottom of a normal
brick,
you will find that it fits tightly. This suggests to me that the side-holes
actually have a greater tolerance, which given there lack of 'give' as I
point out above, seems logical.
"Todd Lehman" <lehman@javanet.com> wrote in message
news:FMsIKp.BBJ@lugnet.com...
> In lugnet.robotics, "Jonathan Perret" <jperret@cybercable.fr> writes:
> > Recently there was a mention here of the problem with studs fitting
> > into beam holes. Fred Martin's "The Art of LEGO Design" was quoted
> > as saying that such a configuration was not intended and that the studs
> > or holes could become damaged over time. I clearly remembered reading
> > that.
> > [...]
>
> I don't think it's correct that such a configuration was unintended. In
> fact, I think it most definitely *was* intended. All the classic LEGO
> measurements are magic multiples of 1/5 the standard interstud spacing,
> which also equals 1/6 the standard brick height (not counting the height
> of the stud). Thus a 1x1 brick is 6 of these units tall (not counting the
> stud) and 5 of these units wide. Both a stud a Technic peg are 3 of these
> units in diameter, and a plate is 2 of these units thick (plus 1 more if • you
> count the height of the studs). There are also half-units of this unit • which
> show up along the peg-hole rims of beams and around the perimeters of • holed
> studs.
>
> Here is what Fred Martin's paper[1] says on page 14...
>
> "You will not see this configuration in LEGO's model plans, because the
> top studs are _slightly_ too big for the axle holes, and a model left
> in this state will gradually experience solid flow as the stressed
> plastic expands. The official LEGO solution is to use the 'connector
> peg with stud' parts (see Figure 22), but this method is actually
> stronger (or at least until the LEGO parts deform)."
>
> ...so he doesn't actually make the claim that it wasn't intended. He just
> warns that the plastic may deform if left like this for long periods of • time.
>
> I just checked the grip on several batches of Technic beams laying around
> at home and none of them gripped studs any tighther than the tubes on the
> bottom of bricks grip studs or the square holes on the back of 1x1 bricks
> with recessed side studs[2] or 1x2x2 standing control units with 3 • studs[3]
> do.
>
> So if, in practice, studs actually become deformed from long sittings in
> such configurations, then it must be due to manufacturing errors rather • than
> design errors in the parts. LEGO wouldn't've goofed something like this • up
> in the design stage, and wouldn't've made the diameter of a peg exactly • the
> same diameter as a stud if it wasn't intended to work this way.
>
> --Todd
>
> [1] http://fredm.www.media.mit.edu/people/fredm/
> [2] http://www.lugnet.com/cad/ldraw/parts/ref/images/4070.gif
> [3] http://www.lugnet.com/cad/ldraw/parts/ref/images/2342.gif
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