efferman Posted February 10, 2011 Author Posted February 10, 2011 Oh yes...I mispelled it LOL. No prob, doka or not your MOC, let's call it 'MOG' instead is really good. I can't wait to see the end result. An instruction for the cabin would be excellent. Please update regularly on your build no prob, you was really near at the right letters. This morning i had read "Double Cab" I could make an instruction, but the cab fits to my 102x32 tires. At smaller tires it maybe looks a little bit to big. hopefully no one want a instruction of the complete moc. i have a few ideas. Knuckle boom Crane with flyjib and cherrypicker mode four point stabilizers 4 Gear transmission switchable in the cab L4 fake engine Tiltable Cab 3-way tipper Trailer Lights compressor, maybe with the lego education kit PTO we will see what i coud realise Quote
Dutch_EE Posted February 10, 2011 Posted February 10, 2011 pneumatic would have the advantage, that is easier to repair than the hydraulic version. But would it be exact too? I doubt it. Air can be compressed, fluids can't. With the compression, it can happen that the steeringcylinder might not move at all. Quote
efferman Posted February 10, 2011 Author Posted February 10, 2011 (edited) i know. Thats the reason why i give pressure on both sides of the piston. The air is compressed before the cylinders are moving. so the Power transfer can work instantly. And the most important, if there are any leaks, off jumping hoses in example, i can repowering it without disassembling the mog. btw. i have some pics from my rearaxles. its not final but i think, something like this will it be Edited February 10, 2011 by efferman Quote
grindinggears Posted February 10, 2011 Posted February 10, 2011 Really good to go for the 6x6 solution regarding the steering I think that a pneumatic system with some decent pressure will work very good for your MOG. BUT: a hydraulic steering would make you a pioneer in that field because there is only one MOC (Timo's Liebherr LTM 1500) that would use this steering apart from yours. So maybe you still want to go for hydraulics BTW: Thank you very much for keeping us up to date so frequently. nice progress! Quote
efferman Posted February 10, 2011 Author Posted February 10, 2011 regarding the steering I think that a pneumatic system with some decent pressure will work very good for your MOG. BUT: a hydraulic steering would make you a pioneer in that field because there is only one MOC (Timo's Liebherr LTM 1500) that would use this steering apart from yours. So maybe you still want to go for hydraulics i will look what i can do, but first i must see with which way i mount the springs/Axleload balancing. and waiting for parts to could build the front axle. Quote
Sam42 Posted February 10, 2011 Posted February 10, 2011 Cheers grohl! for some reason there are a lot of lego unimogs once you start looking, my first truck trialler was a unimog! unimog1 by sam2442, on Flickr Btw efferman, since I have zero doubt about your skills, is there a possibility of making the legendary classic Unimog 406? I would literally kill myself if this could be done using Lego bricks. have you seen lomero's mog? a very nice take on the harder to pull off curvier unimog!- Unimog 416 by lomero, on Flickr Quote
Out of Sight Posted February 11, 2011 Posted February 11, 2011 have you seen lomero's mog? a very nice take on the harder to pull off curvier unimog!- Unimog 416 by lomero, on Flickr Now I have! That turntable for the wheels is a great idea. I guess this will be my last post on eurobricks..I'll shoot myself now. Quote
Sam42 Posted February 11, 2011 Posted February 11, 2011 Now I have! That turntable for the wheels is a great idea. I guess this will be my last post on eurobricks..I'll shoot myself now. so good i had to have a go myself! 21012011309 by sam2442, on Flickr 21012011310 by sam2442, on Flickr 21012011308 by sam2442, on Flickr couldn't manage a portal set up but made quite a nice planetary reduction hub, got the steering centre down to one stud from the mounting holes on the turn table, new cv joints would bring this in one stud giving an even better steering centre, need to get four of these built and tested! Quote
DLuders Posted February 11, 2011 Posted February 11, 2011 (edited) Oooh, I like the PLANETARY GEAR idea! It's similar to those used in automatic transmissions. The 54120 "Tire 94.8 x 44 R Balloon" fits nicely inside the 48452cx1 "Technic Turntable Large Type 2, Complete Assembly with Black Outside Gear Section" parts. Edited February 11, 2011 by DLuders Quote
efferman Posted February 11, 2011 Author Posted February 11, 2011 nice idea with the turntable. good for a 8x8 without portals Quote
efferman Posted February 12, 2011 Author Posted February 12, 2011 good evening, or should i say not so good? Hydrauliks didnt work. The cylinder is leaking at the piston rod maybe this is the only leaking cylinder, but i think using hydraulics for steering is no good idea for my moc. Quote
Sam42 Posted February 12, 2011 Posted February 12, 2011 It's a shame but i had a feeling hydraulic steering wouldn't work out... How does it function pneumatically? Quote
efferman Posted February 12, 2011 Author Posted February 12, 2011 Pneumatics are working, but after a few hours or working cycles, i must refill the steering circuit. now i am not sure if i should use pneumatics or the mini LAs for the steering mechanism. with the mini LAs the gearing will be a challenge Quote
SuperCow Posted February 12, 2011 Posted February 12, 2011 You could try to only use the bottom port with hydraulic. The top seal is very weak. But you cant use a switch or pump then. Quote
efferman Posted February 12, 2011 Author Posted February 12, 2011 if i use only the bottom side, then i need two cylinders, one for left, one for right, to move the wheels. to move this two cylinders, i need two cylinders. in complete i would need, only for the steering of two axles, 8 cylinders. it is possible, but the mechanism would need many space, and for the crane i need cylinders too. thanks for the idea, but it is nothing for me Quote
grindinggears Posted February 12, 2011 Posted February 12, 2011 good evening, or should i say not so good? Hydrauliks didnt work. The cylinder is leaking at the piston rod I have examined that leak issue when building my own hydraulic system. You can read the full post in the hydraulics thread The result is: As the seals get older their tightness decreases. With a cylinder from 2010 I didn't have a leak. Unfortunately it moves very slow because the holes are so narrow. Maybe you want to consider hydraulics a second time? I understand if you do not. Quote
T_Tank Posted February 13, 2011 Posted February 13, 2011 Pneumatics are working, but after a few hours or working cycles, i must refill the steering circuit. now i am not sure if i should use pneumatics or the mini LAs for the steering mechanism. with the mini LAs the gearing will be a challenge New here but I've got a idea for just using pnuematics that might work but not totaly sure why not use a steering rack an add some extra gearing to it for a pnuematic compressor so you don't need to manually recharge the system? An by steering rack i mean like one out of the new backhoe to move the piston in an out that be possibly smaller profile then the MLA compressor. Love the idea to use pneumatics on the axles that would make more compact an more suspension travel. Quote
efferman Posted February 13, 2011 Author Posted February 13, 2011 (edited) Grindinggears, iam searching currently my four log loader cylinders to try it again T_tank, thanks for your suggestion. this is probably a usefull method and i will try it, if i find four not leaking cylinders. the Mini LA compressor was a easy way for the concept test and nothing final. more compact? iam not sure if this is correct hydrauliks are a big advantage for multiple axle steering. This is the only reason why i try it. edit: grindinggears, you are right. New cylinders are working perfect. i have made a little comparisation vid Edit² i have made a steeringtest with a 4x4x4 setup i think it works fine, but a little bit slow Edit³: some pics with cab 104_8220 von efferman auf Flickr 104_8226 von efferman auf Flickr 104_8225 von efferman auf Flickr 104_8223 von efferman auf Flickr Edited February 13, 2011 by efferman Quote
efferman Posted February 14, 2011 Author Posted February 14, 2011 Hydraulics are working very precisely, but there is a big problem. It needs enormus power to push the cylinder in. i think this lies at the very small Intake hole of the bottomside. what do you think about to make the hole a little bit bigger? Quote
Milan Posted February 14, 2011 Posted February 14, 2011 what do you think about to make the hole a little bit bigger? Some will hate me for posting this link, but maybe it would provide progress with hydraulics: Quote
efferman Posted February 14, 2011 Author Posted February 14, 2011 (edited) Thanks for the Vid. Purists will kill me, but i do it edit: it is done and it is a difference like night and day. btw, be carefull at the bottom side and dont drill to wide, or you have two holes Edited February 14, 2011 by efferman Quote
efferman Posted February 18, 2011 Author Posted February 18, 2011 i have found a way which it me allows to keep the frame free of gears. The third axle is connected via a torque tube to the second axle, and the second axle via a torque tube to the gearbox. so the axles could move relatively free and i hve no length changing driveshafts.the traction is good how you see in the vid. Pics are coming this day because the springs, the ground contact between the flat surface and the ascending slope is not good. but if i use a axle load balancing, the torque of third axle lifts the second axle in the air. The current gear ratio is 1:8,33 (2 times 12T to 20T and one 12T to 36T) and the xl fights at the 109% with the weight. i think i need a switchable gearbox or/and a second XL with the full weight of the finished Mog. Quote
freakwave Posted February 18, 2011 Posted February 18, 2011 Wow, efferman, 109% is a good achievement! Looks like the "climbing ability" is just limited by the traction :-) What do you use as torque tube? Quote
efferman Posted February 18, 2011 Author Posted February 18, 2011 the climbing ability is currently limited by the grip and the motor power. no cracking or slipping gears till yet. i have used perpendicular axle joiners(the correct description?) and my beloved Linear actuator parts to get the power from the axles to the frame. more pics when the folder is online again. next building step is the gearbox Quote
DLuders Posted February 18, 2011 Posted February 18, 2011 @ efferman: To select the Lego tires that have the best grip, see Philo's "Wheels, Tyres and Traction" research findings. Quote
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