Subject:
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Re: How much weight can a LEGO chassis carry around?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 10 Dec 2005 18:25:14 GMT
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Viewed:
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1595 times
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If they can build bridges that can take a few something like 28-30
kilos of weight, then handling a laptop is not impossible. It would
really be a matter of doubling up load-bearing beams and supporting
them with the right structure, being aware of weak points, and where a
beam may bend or break. It is about making sure that there are
multiple supports so that one pin is not left bearing it and gets
sheared off. I really dont doubt that Lego can do this, but it is
really a matter of the engineering. You might have to build it larger
than you wanted, but it is doable.
You might really have to do your home work on load bearing structures,
bridges, lattices and techniques to take the force away from
troublesome hotspots. I look forward to seeing it. I have been
considering building a Lego bot chassis around an SBC for a while, but
not entirely sure what to do with the power supply yet.
--
Danny Staple MBCS
OrionRobots
http://orionrobots.co.uk
(Full contact details available through website)
On 10/12/05, Mr S <lego-robotics@crynwr.com> wrote:
> Dan,
> I remember seeing this robot. I didn't remember that
> you built it, but its impressive.
>
> OT Comment: Can't use $ony products anymore though
>
> I think you underestimate the ability of Lego for
> strength. Construction techniques make it possible to
> build quite sturdy Lego robots. You do need to be
> mindful of the mechanics of structural stresses, but I
> think every Lego builder is to some extent or another.
>
> I wish I was not going to be so busy for the next 2
> months, but the once per year visit with in-laws and a
> day or 5 on the piste is just mandatory to put at the
> top of the to-do list this time of year.
>
> One of my projects for next year though is going to be
> a Lego robot that can carry a dead weight laptop. Just
> to say it can or cannot be done with a regular sized
> average type laptop. I'll try to set the record for
> load bearing capacity in a Lego robot :) Of course,
> anyone is invited to beat me to it as well.
>
> Cheers
>
>
> --- dan miller <danbmil99@yahoo.com> wrote:
>
> > Apologies if this double-posts, Yahoo is in a mood.
> >
> > I solved your problem by purchasing the lightest
> > laptop I could find, a Sony
> > ultralight (PGC 161L, $800 on ebay). It's a hair
> > over 2 lbs, and I've used
> > it on a couple projects:
> >
> > http://www.danbmil.com/lego/
> >
> > It has a built-in camera, which is very cool. The
> > last 'bot in these pix
> > could locate a bottle (with a pattern of stripes
> > taped on it), go to it,
> > pick up the bottle and bring it back to me (sort
> > of..) It was definitely
> > pushing the limit on Lego load-bearing capacity.
> > Note the omniwheel casters
> > from Charmed Labs. (the laptop sat right behind the
> > RCX's, with the top
> > flipped up and the camera, which is on this little
> > swivel, pointing
> > forward).
> >
> > As for doing it with a regular-sized laptop (6-8
> > lbs), I think your best bet
> > would be the trailer, but it just might be too big.
> > Two sets of double
> > wheels each, right near the center of gravity, with
> > a caster cantilevered
> > out (so it doesn't bear much weight) could do the
> > trick. Or pick up the
> > Omniwheels, they're pretty cool.
> >
> > -dbm
> >
> >
> > ps I recently started a platform that uses three
> > Lacrosse balls in little
> > cages as the wheels. Will post when I get around to
> > it.
> >
> >
> > --- steve <sjbaker1@airmail.net> wrote:
> >
> > > Joe Strout wrote:
> > > > In lugnet.robotics, Nathan Colyer • <ncoly1@eq.edu.au> wrote:
> > > >
> > > > > It might work to make a robot that tows the • laptop on a trailer setup?
> > >
> > > I don't see how that solves any problems.
> > >
> > > > Ah, sort of the 18-wheeler approach to carrying • heavy loads. That's not
> > > a bad
> > > > idea; certainly it solves the axle-support and • skid-steering problems.
> > >
> > > How? The trailer still has to have a bunch of • axles in order to spread
> > > the weight - and when you do that, the trailer is • (in effect)
> > > skid-steering.
> > >
> > > > But it
> > > > makes the steering code a much harder problem, • doesn't it? I can
> > > imagine my
> > > > poor bot getting stuck in a dead-end hallway, • having a hard time turning
> > > itself
> > > > around.
> > >
> > > That's the cool thing about using a synchro • platform - the robot can
> > > drive in any direction it wants without turning • around (in fact, it
> > > *can't* turn around). But it is the ultimate in • manouverability.
> > >
> >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam? Yahoo! Mail has the best spam
> > protection around
> > http://mail.yahoo.com
>
>
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Message has 2 Replies:
 | | Re: Heavy load on LEGO chassis over uneven ground
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| (...) Another thing to consider when carrying so much weight is the gear ratio and motor power required. An under-powered robot with excess shaft friction will not drive in a straight line! I built a strong robot chassis a few years ago using 12V (...) (19 years ago, 11-Dec-05, to lugnet.robotics)
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Message is in Reply To:
| | Re: How much weight can a LEGO chassis carry around?
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| Dan, I remember seeing this robot. I didn't remember that you built it, but its impressive. OT Comment: Can't use $ony products anymore though I think you underestimate the ability of Lego for strength. Construction techniques make it possible to (...) (19 years ago, 10-Dec-05, to lugnet.robotics)
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