Bison Posted January 24, 2014 Posted January 24, 2014 I am planning to make a big articulating tractor but I don't know how to make the steering. I need the front end to turn the way the steering wheel turn but the back end to turn the opposite way. Here is a picture of the tractor I am planning to build( once I get more pieces ) https://encrypted-tb...S_Xaa7ybIeG9IvQ Thanks. Quote
efferman Posted January 24, 2014 Posted January 24, 2014 https://www.dropbox.com/s/pmxf4dye6x1atum/bigscalewheelloaderchassis.lxf Look at this ldd file, there is a good working articulated steering mechanism in a pretty big vehicle Quote
Alasdair Ryan Posted January 24, 2014 Posted January 24, 2014 (edited) Here you go,if you need a LXF file made just ask. Edit I think I misunderstood.... Edited January 24, 2014 by Alasdair Ryan Quote
Bison Posted January 24, 2014 Author Posted January 24, 2014 Maybe a clearer picture would be nice. i think it will work. Quote
Bison Posted January 24, 2014 Author Posted January 24, 2014 The 12 bevel gear drives a black double bevel gear. Is that right? Quote
Alasdair Ryan Posted January 24, 2014 Posted January 24, 2014 Yeb that in turn drives the two black bevel gears at the steering rack. Quote
DrJB Posted January 24, 2014 Posted January 24, 2014 (edited) Here you go,if you need a LXF file made just ask. Edit I think I misunderstood.... You built that (so quickly) just to answer the OP's question ... or had it build for a while? Either way, impressive! Edited January 24, 2014 by DrJB Quote
Zerobricks Posted January 24, 2014 Posted January 24, 2014 Articulazed steering means the whole tractor pivots around a single central axle... Quote
Alasdair Ryan Posted January 24, 2014 Posted January 24, 2014 You built that (so quickly) just to answer the OP's question ... or had it build for a while? Either way, impressive! I just built it there and then...2 mins? Quote
Hrafn Posted January 24, 2014 Posted January 24, 2014 I am planning to make a big articulating tractor but I don't know how to make the steering. I need the front end to turn the way the steering wheel turn but the back end to turn the opposite way. Here is a picture of the tractor I am planning to build( once I get more pieces ) https://encrypted-tb...S_Xaa7ybIeG9IvQ Thanks. It's hard to tell from the small photo exactly how the steering on the real thing works, but one approach to an apparently similar tractor is here. Search the forums (and MocPages and flickr and Brickshelf) for "articulated hauler" and you'll find similar implementations. The linear actuators are probably a better solution than pneumatics, because they move slowly and can be stopped at any intermediate position; pneumatic cylinders are much harder to control precisely. Quote
DrJB Posted January 25, 2014 Posted January 25, 2014 (edited) Sounds like it's your lucky day, with so much expertise around. I'll add my 0.02. The picture you're showing (is it a Case IH tractor?) shows what appears to be an articulated tractor. Articulated Tractors (and wheel-loaders) steer by rotating the front-half of the machine relative to the rear-half. The chassis itslef is made-up of two large sections, that are articulated in the middle. Strictly speaking, such large tractors have NO steerable wheels. The wheels' position is always fixed relative to the chassis (or half-chassis in this case). Such configuration is VERY different from the so-called 4WS (4 wheel steer). In 4WS vehicles, the chassis is a single bulky piece, and both rear and front tires can pivot about vertical axes. In some even older machines, the wheels do not rotate relative to their axles, but both axles pivot about their center vertical lines ... If you are after an articulated chassis design, then look up the instructions for 8265, you can easily get them in PDF from the lego site. Hope this helps, else, ask away. Edit: Also, I do not recall the name of the user but, someone sometime back mad a Case Steiger 4WD tractor with lego ... might be worthwhile looking it up. Edited January 25, 2014 by DrJB Quote
Kronos Posted January 25, 2014 Posted January 25, 2014 (edited) Also, I do not recall the name of the user but, someone sometime back mad a Case Steiger 4WD tractor with lego ... might be worthwhile looking it up. Is it this one? http://mocpages.com/moc.php/272861 Edit: Yeah thats the one. It's also here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=474751 Right dhc6twinotter? Edited January 25, 2014 by Kronos Quote
dhc6twinotter Posted January 25, 2014 Posted January 25, 2014 If you don't want to use LAs, 8439 is a great set that has articulated steering and a working steering wheel. You may be able to copy the steering system from this. D3K has an articulated steering system on his swing loader, and I believe instructions are available for it. It does use mini-LAs, and I don't think it has a working steering wheel. Edit: Also, I do not recall the name of the user but, someone sometime back mad a Case Steiger 4WD tractor with lego ... might be worthwhile looking it up. That may have been me. I built one a couple years ago. I don't have very good pictures of the articulation joint, but here are a few pictures (assuming stupid new flickr works): That was before mini-LAs came out, and if I were to do it again, I'd probably use mini-LAs. No working steering wheel with this model either. Quote
Gee Posted January 25, 2014 Posted January 25, 2014 (edited) Hey DHC6 - I love that chassis. Neat solution to being pendular and having steering. I may nick that idea for my next MOC! OP - Check out Sariel's BV-a-like. It has a hinge between cabs that is a bit different to what's currently been shown and provides plenty of degrees of movement and articulation. Steers via gears as opposed to LAs. http://sariel.pl/201...gglunds-bv-206/ You can see it working clearly in the video. Edit: Here's another example of articulated steering which is different again: Edited January 25, 2014 by Gee Quote
efferman Posted January 25, 2014 Posted January 25, 2014 and my version from post two and a different steering method http://www.brickshelf.com/cgi-bin/gallery.cgi?f=401452 Quote
Gee Posted January 25, 2014 Posted January 25, 2014 That BV steering is genius Efferman! Especially in such a small space. This is a great little thread, shows just how many different ways there are to skin a cat. Quote
D3K Posted January 25, 2014 Posted January 25, 2014 My swingloader used some very good geometry I got from jorgeopesi, with two small LA's. I actually did implement a working steering wheel as well, using a very simple mechanism, driven by the inner gear of a large turntable:-) Quote
Bison Posted January 25, 2014 Author Posted January 25, 2014 The picture you're showing (is it a Case IH tractor?) No Its a Massey Ferguson 5200. I rather not use LAs, but I will use gears. If you don't want to use LAs, 8439 is a great set that has articulated steering and a working steering wheel. You may be able to copy the steering system from this. I did look at that and I think that will also work. Plus it uses most of my parts that I have! Quote
Mechbuilds Posted April 10, 2019 Posted April 10, 2019 Instead of creating another thread, i'm going to resurrect this. First question: I need help with articulated steering! I'll be using two smaller linear actuators and for steering. It'll be M-motor driven. Does anybody have a mechanism like this i could copy and modify? Second question: It'll be roughly 42030 size and it's a harvester. Will the triangle beam support the weight or should i use two turntables? Quote
LucyCol Posted April 10, 2019 Posted April 10, 2019 Check out this thread @grum64 has just built 42030 with @efferman steering mod which uses the small actuators. Quote
Mechbuilds Posted April 10, 2019 Posted April 10, 2019 Just now, LucyCol said: Check out this thread @grum64 has just built 42030 with @efferman steering mod which uses the small actuators. Thanks! Just what i was looking for! Quote
kennywest Posted April 11, 2019 Posted April 11, 2019 I am working on the smaller brother of the one you're going to build here. It also has articulated steering and very small turning radius Quote
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