piterx Posted October 28, 2014 Posted October 28, 2014 Hello guys i don't know if you were following the other bikes thread... I decided not to hijack that and make my own one so: the point of this thread is not SHOWING you a model but actually getting ideas from you on how to make my prototype work properly. this is what i got for now it kinda works but it's still very unstable and i'd need way more space to countersteer once it starts leaning left or right to keep it straight. Another problem is given by flat surfaces...the RC motor gives the wheel so much power that it's like driving a real bike on ice if anyone of you has more space than me and would like to test it you're welcome :) Quote
piterx Posted October 28, 2014 Author Posted October 28, 2014 so here's the MK II it works better as the rear tyre is way wider than the other unfortunately i have to solve a weight distribution problem when the bike leans to the right, as its heavier on the left can get up...in the opposite case it doesnt... if it's perfectly balanced i think it could work properly the main goal is making it go straight xD are there any heavy pieces i could add for counterweight on the right side? Quote
zux Posted October 28, 2014 Posted October 28, 2014 (edited) What about boat weight? It is quite similar to RC motor in weight. Edited October 28, 2014 by zux Quote
Sylvian Posted October 28, 2014 Posted October 28, 2014 First of all i've never attempted such a build... but i was thinking maybe you can make a mechanism which allows you to adjust lateral weight distribution. Quote
Zerobricks Posted October 28, 2014 Posted October 28, 2014 What about using 2 RC motors? Though it may be an overkill... Quote
Brickend Posted October 28, 2014 Posted October 28, 2014 (edited) Could you try removing the steering system? It would lower the center of gravity significantly and would maybe allow for the front wheel to self centre, like a riderless bicycle? It might be though that Lego tyres lack the weight to provide a meaningful gyroscopic effect at the speeds achievable. I've never tried it, but I've wondered if the action of spinning a M-Motor, unconnected to any sort of steering mechanism, either left or right would have enough of an effect on it's own to cause a turn. Edited October 28, 2014 by Brickend Quote
piterx Posted October 28, 2014 Author Posted October 28, 2014 actually the steering system works fine and it's centered the problem it has lays on the rear axle wich has the weight on the left due to the RC motor shape you might be right about the M motor i've tried to add more weight inside the wheel and it seems a little bit better still the lack of grip is quite relevant Quote
D3K Posted October 28, 2014 Posted October 28, 2014 THe heavier the wheels, the better, as it will have a gyroscopic effect (is this the proper term?), helping to keep it upright. I've been playing around with ani idea in my head, using the servo motor to shift some kind of weight from left to right and center to make it steer. What stopped me from making prototypes is the same problem you're facing: lack of space You'd need a basketball court or something similarly sized Like yours is now, the steering angle is way to big relative to the speed at which it travels. On my bike thought experiment, I think shifting the weight would be enough to get it to steer. A bike like this needs to go fast in order to maintain stability. I'm certain it will work! Quote
piterx Posted October 29, 2014 Author Posted October 29, 2014 Third prototype Finally this one is giving me some results it's still a little bit unbalanced to the right i need to add some counterweight more to the left but i have to modify the chassis first to make the IR reciver fit inside of it. what im gonna do tomorrow is lower the battery by one stud so the reciver and the plugs fit perfectly inside of it and the two grey supports as well so the bike will lean less than now this one is the one who made more way straight before losing balance what i want to achieve is allowing the bike to get back straight once it's leaning left or right so it can also start while being still :) im kinda happy with the overall shape as well lol hope you'll like it...and i really hope ill manage to get it right so everyone can have fun with it :P Quote
Zerobricks Posted October 30, 2014 Posted October 30, 2014 Looks really great! P.S. Dont forget to brace the gears so they dont slip out (maybe few axles with stops). Quote
piterx Posted October 30, 2014 Author Posted October 30, 2014 Fourth prototype looks better and seems more stable but i won't know if it really works until i bring it on some concrete the marble i have on my floor makes it drift too easy Quote
timslegos Posted October 30, 2014 Posted October 30, 2014 Is it stable enough to stay upright on its own? How about when it turns? tim Quote
piterx Posted October 30, 2014 Author Posted October 30, 2014 i still can't really tell... to stay upright it should run...and i'd need way more space and a surface with more grip to test it :\ it kinda works but there's still lot to do before claiming a win :D Quote
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