Alasdair Ryan Posted January 29, 2013 Posted January 29, 2013 I was using a motor at the time,it was not by hand. Effermans solution I think would give backlash if motorized. Quote
efferman Posted January 29, 2013 Posted January 29, 2013 (edited) surely you can ask, but first i have to rebuild it. tomorrow i can show you the pictures of the concept edit: a simplyfied concept, without backlash, and no syncronizing problems and when the switch is in center the steering is locked to prevent hyjacking of the car is something like this possible in your model? Edited January 29, 2013 by efferman Quote
allanp Posted January 29, 2013 Posted January 29, 2013 For it to stay in sync you would need a mechanism that, if the car is at full lock and you change the steering mode, the rear wheels would have to go to steer the opposite way without turning the steering wheel. So far non of the solutions suggested solves that problem. But of the ones suggested I think mine and effermans are the most useful to you. Mine has the benefit of giving you a different gear ratio (like you asked for) whilst effermans has the advantage of more compactness (also like you asked for). In order to keep the wheels sycronised a slightly complex linkage system would be required and i'm not sure it would fit without substancial modification. Quote
Kumbbl Posted January 29, 2013 Author Posted January 29, 2013 surely you can ask, but first i have to rebuild it. tomorrow i can show you the pictures of the concept edit: a simplyfied concept, without backlash, and no syncronizing problems and when the switch is in center the steering is locked to prevent hyjacking of the car is something like this possible in your model? Hmm, maybe, maybe not - i can only give an answer after understanding this cute piece of technic - currently i worry that i do not: what is here input, what output, wich part causes the direction change... probably all of them are dumb questions, sorry for this.... ...haha... Greetz Markus haha, really funny - IMHO a really smart idea, simple and effective - congrats! Quote
Lipko Posted January 29, 2013 Posted January 29, 2013 (edited) Keep them ideas coming. It's something I have to solve for the telehandler. For the synchronization, you could use something (that's attached to the gear-rack for example), that prevents the sliding axle from sliding if the wheels are not in center position. I like Efferman's idea with the double rack, but the knob gear thing is promising too (maybe the knobs themselves can prevent switching if the thing is not centered). The biggest problem is that I couldn't find out how does it work in real life. Are you allowed to switch any time, or there is the allowed-only-in-center constraint too? EDIT: Hopey's idea is promising too, it would let more positions too (crab steering, normal steering, low radius circle steering) and no synchronization would be needed. Though it seems to be hard to implement with Lego. Edited January 29, 2013 by Lipko Quote
Zazck Posted January 29, 2013 Posted January 29, 2013 (edited) An idea how to eliminate slip on the switch side, driving ring inside a differential. The axles are joined at the center of the differential with an axle joiner, part 6538. Similar configuration could probably also be used on the output side to completely eliminate any slip. Red axle = input, blue and green axles = output. Edit: Realized it can't really eliminate slip on the pulling side of the axle. Still, might be useful to some. Alternate version. Gears cant slip when pushed. Edited January 29, 2013 by Zazck Quote
efferman Posted January 29, 2013 Posted January 29, 2013 Hmm, maybe, maybe not - i can only give an answer after understanding this cute piece of technic - currently i worry that i do not: what is here input, what output, wich part causes the direction change... probably all of them are dumb questions, sorry for this.... a gear is moving in two directions. one side to the left and the oposite side to the right side. if you now use two gear racks like on the pictures, and slide the gear from the first rack to the second rack it will change the direction of the steering rack. Quote
Kumbbl Posted January 29, 2013 Author Posted January 29, 2013 a gear is moving in two directions. one side to the left and the oposite side to the right side. if you now use two gear racks like on the pictures, and slide the gear from the first rack to the second rack it will change the direction of the steering rack. ah, cool - as simple and good as it gets... probbaly not applicable to the steering of the 8880 but i will check it... anyway its a great idea! Quote
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