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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Fri, 9 Dec 2005 04:31:17 GMT
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Viewed:
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1345 times
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In lugnet.robotics, steve <sjbaker1@airmail.net> wrote:
> Joe Strout wrote:
>
> > So now I'm wondering whether it'd be at all feasible to build the chassis out of
> > LEGO. The laptop weighs 5 or 6 pounds. I don't need it to move around in a
> > particularly speedy manner, but faster than a turtle would be nice. I can use
> > multiple motor controllers to drive more than 2 motors on a side, if that helps.
>
> Well, you can build enormous and very strong structures out of Lego -
> there are people who've built life-sized dinosaurs and such. With
> enough Lego and careful construction, I have no doubt you could build
> something that would carry 50 or 60 pounds.
>
> Actually driving it along at any significant speed might need more than
> 2 motors, but that too is do-able if you have enough parts.
>
> I don't think you'd have much difficulty moving 6 pounds over smooth,
> level flooring with even the simplest construction.
The Achilles heal is the bearing ability of a cross axle in a hole. Above a
certain load, you will make a constant supply of ABS dust, which means you will
have to replace a few key pieces from time to time. Beyond the actual bearing
surface between axle and hole (which can be lessened with two - side by side
holes, ie two side by side pinned beams) is strengthening the axles. I have done
this with the six hole pulley. You can connect six hole pulleys into stubby axle
stiffeners by putting 3L black technic pins through all six holes making a very
stout 3L axle stiffener. If you can get a bearing on the outboard end of the
axles which are driving the main wheels or treads, you can halve the bearing
load that way too.
JB
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Message has 2 Replies:
 | | Re: How much weight can a LEGO chassis carry around?
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| (...) Yeah - but you can add more axles and more wheels so that the load is shared across more axles. That keeps the distance between the axles small which helps out with chassis stiffness issues too - and since you'll probably want more than two (...) (19 years ago, 9-Dec-05, to lugnet.robotics)
| | | Re: How much weight can a LEGO chassis carry around?
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| (...) It might work to make a robot that tows the laptop on a trailer setup? At a parent night at my school, I towed small children on a trailer (a couple of physics crash carts that they stood on like skatebaords), using a simple robot driven by (...) (19 years ago, 9-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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| (...) Well, you can build enormous and very strong structures out of Lego - there are people who've built life-sized dinosaurs and such. With enough Lego and careful construction, I have no doubt you could build something that would carry 50 or 60 (...) (19 years ago, 9-Dec-05, to lugnet.robotics)
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