 | | Re: How much weight can a LEGO chassis carry around? —John Barnes
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| | | (...) 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 (...) (19 years ago, 9-Dec-05, to lugnet.robotics)
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| | | | | Re: How much weight can a LEGO chassis carry around? —steve
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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)
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| | | | | | | Re: How much weight can a LEGO chassis carry around? —Joe Strout
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| | | | | | (...) Right, at least with differential steering. I've been thinking that perhaps I would be better off with Ackerman steering (like a car). And while I'm at it, I wonder whether I might have the back wheels turn as well as the front wheels -- (...) (19 years ago, 9-Dec-05, to lugnet.robotics, FTX)
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| | | | | Re: How much weight can a LEGO chassis carry around? —Nathan Colyer
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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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| | | | | | Re: How much weight can a LEGO chassis carry around? —Joe Strout
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| | | | (...) 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. But it makes the steering code a much harder problem, doesn't it? I can imagine my poor bot (...) (19 years ago, 9-Dec-05, to lugnet.robotics, FTX)
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| | | | | | RE: How much weight can a LEGO chassis carry around? —Dennis L Hitzeman
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| | | | | What about mounting the laptop on a caster platform similar to the syncro platform mentioned earlier, but without all of the drive components. A single set of drive elements, mounted in the middle of the platform, could provide locomotion, while (...) (19 years ago, 9-Dec-05, to lugnet.robotics)
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| | | | | | | Re: How much weight can a LEGO chassis carry around? —Joe Strout
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| | | | | | (...) Yes, that's not a bad idea -- nor is the synchro platform, except that that seems a bit complex (and expensive) for me. If I wanted complex and expensive, I'd be building the chassis out of Lexan or aluminum instead of LEGO. :) The trouble (...) (19 years ago, 9-Dec-05, to lugnet.robotics, FTX)
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| | | | | | Re: How much weight can a LEGO chassis carry around? —steve
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| | | | (...) I don't see how that solves any 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. (...) That's the cool thing about using a (...) (19 years ago, 9-Dec-05, to lugnet.robotics)
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| | | | | | Re: How much weight can a LEGO chassis carry around? —dan miller
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| | | | 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: (URL) has a built-in (...) (19 years ago, 10-Dec-05, to lugnet.robotics)
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| | | | | | Re: How much weight can a LEGO chassis carry around? —Mr S
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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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| | | | | | Re: How much weight can a LEGO chassis carry around? —danny staple
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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 (...) (19 years ago, 10-Dec-05, to lugnet.robotics)
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| | | | | | Re: How much weight can a LEGO chassis carry around? —Amnon Silverstein
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| | | | | I built a laptop roving wireless web controlled robot 4 or 5 years ago. Check it out at: (URL) (19 years ago, 11-Dec-05, to lugnet.robotics)
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| | | | | | | Re: How much weight can a LEGO chassis carry around? —Mr S
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| | | | | | Amnon, Wow, you beat me to the goal by miles.... but I will still probably do this, just because... its a Lego thing :) (...) (19 years ago, 11-Dec-05, to lugnet.robotics)
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| | | | | | Re: Heavy load on LEGO chassis over uneven ground —Mark Bellis
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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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