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Is this what your looking for? (URL) Fay rfay@we.mediaone.net The Shop (URL) Fusion" <mikefusion@hotmail.com> wrote in message news:G599FE.CI5@lugnet.com... (...) day (...) low (...) the (...) (24 years ago, 8-Dec-00, to lugnet.robotics)
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actually i wasn't talking about a synchro- i am going to tackle that problem when i get some more turntables i was talking about (bad ascii art to follow) '|||' is the body of the platform |---| ||| |---| this is straight '|'s are the wheels \---\ (...) (24 years ago, 8-Dec-00, to lugnet.robotics)
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"Mike Fusion" <mikefusion@hotmail.com> wrote in message news:G59q8z.7Fw@lugnet.com... (...) problem (...) This looks a lot like the 8880 Super car. (URL) the building instructions and see if it relates to your needs. -- Bob Fay rfay@we.mediaone.net (...) (24 years ago, 8-Dec-00, to lugnet.robotics)
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(...) If you're looking for a solution without Lego turntables look at this site (URL) has not the accuracy as a synchro with lego turntables but it does work. BTW it has only about 100 degrees of freedom but you reach every point you want to reach (...) (24 years ago, 8-Dec-00, to lugnet.robotics)
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(...) If you're looking for a solution without Lego turntables look at this site (URL) has not the accuracy as a synchro with lego turntables but it does work. BTW it has only about 100 degrees of freedom but you reach every point you want to reach (...) (24 years ago, 8-Dec-00, to lugnet.robotics)
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okay, i guess i am not getting the proper idea across... i do not want a synchro-drive, i'm looking for a solution to the problem of having the back wheels turn opposite from the front wheels thus trimming the turing radius down. now, the drive (...) (24 years ago, 11-Dec-00, to lugnet.robotics)
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(...) Hi Mike, I of course see that you are willing to build a robot that turns front and back wheels in different direction! But you said :".... i am going to tackle that problem when i get some more turntables"! Right? The only thing I wanted to (...) (24 years ago, 11-Dec-00, to lugnet.robotics)
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i'm sorry if i offended anyone but i got like a ton of email from people saying that i should use a synchro drive and it is exactly the opposite of what i was looking for... the super car was more on the track but i didn't look at it closely enough (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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The 8880 is four wheel drive and four wheel steering. -- Bob Fay rfay@we.mediaone.net The Shop (URL) (24 years ago, 12-Dec-00, to lugnet.robotics)
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thanks bob, i guess i should have looked down a little further for that scan at brickshelf... that was exactly what i was talking about. after doing some searching i found out that it is called "Central Steering" (?) that is all. m. Bob Fay (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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(...) It does, however, get more complicated that than - see a recent thread on lugnet.technic discussing this: (URL) would have flagged it up to you before, but the thread did not deal with the issue of powering the axles, only steering. (...) (24 years ago, 13-Dec-00, to lugnet.robotics)
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thanks jennifer, those threads help some, but i have put the whole idea behind me for the present and started working on the phased walking mechanism for the december challenge actually now that i saw more of the printout those writings helped lots (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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(...) Heh! I've come to the conclusion that while it is interesting to tinker with suspensions, it is better to use the space in the models for other things. After all, the suspension one can make in a LEGO model is nowhere near realistic in it's (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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(...) ... A number of cars have done this in the past, though not many were brought to the US. Amusingly enough, a little-known option on the 240SX (I forget which years) is the HICAS (HIgh CApacity Steering) system which is a 4WS option. The rear (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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(...) If you are parallel and very close to an obstacle, like a curb or a wall, you can't get away from it with all-wheel steering. As soon as you turn the wheel to get the front away from the wall, the back of the vehicle will smash into it. This (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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(...) Thanks for that explanation, everything is much clearer now. I suppose it is to do with the line perpendicular to the vehicle coinciding with the centre point of the turning circle; with all wheel equal steering, it will intersect the middle (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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(...) Yes, I agree here. I suspect much of it has to do with the weight and balance of a Technic model, which is going to be vastly different, even in scale terms, from a real vehicle. Saying that, the suspension on the 8448 seems pretty realistic, (...) (24 years ago, 15-Dec-00, to lugnet.robotics)
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Another problem with all wheel steering is the problem of "switch over." Honda had a prototype of an all wheel steering car which used the mechanism of turning the wheels in opposite directions at slow speeds for improved turning radius and turning (...) (24 years ago, 15-Dec-00, to lugnet.robotics)
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(...) Many kinds of construction equpiment actually use unsprung suspensions, so I think this is a sane approach. A telescopic handler, for example, needs to be able to lift many different kinds of weights, hence it cannot have the kind of (...) (24 years ago, 17-Dec-00, to lugnet.robotics)
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(...) Indeed - I've seen a good variation of this with a 4 axled vehicle which had two bogies with two axles each. Each pair of wheels on the side of each bogie had longitudinal pendulum type unsprung suspension, and the front bogie had an (...) (24 years ago, 18-Dec-00, to lugnet.robotics)
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(...) For our purposes, this may not matter. However, couldn't the rear wheels be steered with a reciprocator? So as the steering wheel turns to the right, the rear wheels start turning right, then turn back to the left? So at, say 1/4 turn, the (...) (24 years ago, 18-Dec-00, to lugnet.robotics)
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