Subject:
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Re: building thicker technic axles
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 27 Nov 2001 21:49:29 GMT
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Viewed:
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610 times
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In lugnet.technic, Mark-Jan Bastian writes:
> Hello,
>
> When I see those very big cranes, I wonder how the pivoting points
> at the bottom of the large booms can hold it out. Are two or more
> beams with a technic axle enough to handle the enormous force ?
>
> I was wondering if it's possible to build thicker axles from lego,
> for example, using 2x2 round bricks with axles through them, supported
> by plates with holes and beams on the side.
>
> The 2x2 round bricks can then be supported by round corner bricks:
>
> http://guide.lugnet.com/partsref/search.cgi?q=corner+round
>
> These corner bricks have to be mounted sideways, and supported
> by sideway-mounted plates. At least 4 corner pieces are needed to
> contain a 2x2 round brick. A plate-contruction around the corner
> pieces is needed to make it all solid. The corner stones should be
> supported by bricks to the sides and underneath it.
>
> Not very usual construction, but maybe worth to experiment with.
> I don't have any round corner stones, but have seen them in
> 60..70's lego sets a long time ago.
>
> Will this idea work ?
>
> Mark-Jan
Probably, but I think an easier solution is to have multiple shearing planes
on your axle (a normal Technic axle). You can kind of see this idea in my crane:
http://www.texbrick.com/creations/crawler_crane/crawler/cwl5.html
I don't know how much shear force an axle can take, but I know it's quite a
bit. I've never tested one to failure, but I'd bet it's many 10's of
kilograms (20... 30?). If you spread out the shear force on multiple planes
of failure (potential failure, that is ;-) then the shear capacity of your
axle is greatly increased.
TJ
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Message has 1 Reply:
 | | Re: building thicker technic axles
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| (...) One thing I noticed about Technic Axles is that they seem to have a bit of rational flex. You have to have something with a bit of mass being rotated about the axle to notice it. Look at my znap/technic ferris wheel here ... (URL) The center (...) (23 years ago, 27-Nov-01, to lugnet.technic)
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Message is in Reply To:
| | building thicker technic axles
|
| Hello, When I see those very big cranes, I wonder how the pivoting points at the bottom of the large booms can hold it out. Are two or more beams with a technic axle enough to handle the enormous force ? I was wondering if it's possible to build (...) (23 years ago, 27-Nov-01, to lugnet.technic)
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