Becs

Got some pictures of the underside taken Front axles with the Servo-motor and valve controlling fifth axle steering lock. Walking tables Drive axles Fifth axle Close up of fifth axle with steering lock engaged. Lock disengaged and turning. Happy Building Becca

Thank you! It makes me happy that you like it so much @The_Brown_Hornet: This truck has caused me a lot of headaches, nearly drove me to the point of giving up. I've had to rebuild almost everything a couple of times just to change small things. Keep at it and you will get there eventually @TJoling: The valve system for rear axle steering is to allow self-steer when there is no steering input. @Askan: Mechanical accuracy may be at the top, but visual accuracy comes pretty high too If you really want to build this I would recommend a table longer than 170cm (the truck is 160cm) with access to both sides. Its a pain to lift and turn it around to reach the opposite side I have no real estimate on part, but I'm guessing some where between 5k and 10k with at least 7m of pneumatic hose. @aeh5040: It amazes me too that it works I had planned on documenting it, but thought that instructions would be a cool way of sharing the experience @Lucio Switch: Oh, yes, the steering system. The biggest pain of the whole build, I lost count on how many rebuilds it went through @Milan: The problem is the weight. Most of it is over the first axle, thereby making it heavier to steer. It performed slightly better before I rebuilt the cab with full interior adding another kilogram of weight. I will start disassembly on Monday, so any last request on detail shots? I'm going to figure out a way to get shots of the underside today. Happy Building Becca

Hello everyone! Darn it, another day of back breaking snow shovelling. I'm beginning to seriously consider moving to Glasgow Anyway, video is done! Admire the awesomeness of large scale building! Um.. Not sure where that came from, but carry on. I hope it shows what you want to see. If there is anything you want to see in more detail, tell me and I will take some shots later when I disassemble With that in mind, anyone crazy enough to want to try and build this beast? Meaning, should I make photo instructions? Happy Building Becca

I'm happy you like it @LeocornoProductions: A large collection of parts allows for big projects. It can't move around in my bedroom either @Mordep: I have no count on the pieces, that will come later when I disassemble it. Wouldn't surprise me if the count would be close to 10k @Lucio Switch: Space might be a problem for driving, will try to find somewhere with good camera view to show it moving in a straight line just to show the speed, turning is impossible here Comparing our trucks I see that yours is more detailed and built for performance, whereas mine is more built for mechanical accuracy. I don't know what goal you had for yours when building, my goal was to build the functions to be as near the real thing as possible. This had the cost of performance but that's acceptable for me. It's just my style of building, accuracy is high on the list for the perfectionist in me Doesn't stop me from admiring people making things with other priorities, like yours. Happy Building Becca

Damn weather, nearly hurt my back shovelling snow today. Almost makes me wish I lived in Glasgow. @rollermonkey: The two L-motors drives it around quite easily across flat ground with reasonable speed. The whole thing weighs about 9 kg and about I'm guessing about 4 kg of that is located above the first axle. Not as much weight is over the rear axles is making them spin rather than push the truck over obstacles thicker than 1 cm. The other functions will be shown later @Dafgek81: What's wrong with Scania? I'm a Swede, it's either Scania or Volvo, and I couldn't find as good blueprints for Volvo trucks as for Scanias. Anyway, got some pictures taken: The first two axles are steered by one M-motor with linkages just like the real truck. Axle five is self-steered but can be force-steered with pneumatics, I also built a pneumatic lock to keep it straight. Both pneumatic functions are controlled by Servo-motors. Here is the interior. As you can see, it is build in double layers, even the roof, making the cab alone weigh 2 kg. The steering wheel, here seen through the sunroof, is connected to the steering, as it should be Here you can see the front walking table at its extreme positions. They are driven by one M-motor. On the second picture you can see the prop shaft that is delivering power to axle three and four from two L-motors under the cab. Total gear reduction is 1:8,75. And here is the rear walking tables, also driven by a M-motor. The rear section is actually a trailer, but its built together with the truck making it locked from side to side movement. It is hinged though at the level of the hitch seen in red. On the real truck the whole trailer can be lifted by hydraulic rams under the hitch, I tried but Lego flexes too much and pneumatics are too weak to lift it. The last remote functions can be seen here. Support legs for loading and the loading ramps, both driven by M-motors. Looking at the truck from the rear you can see the tail lights of the truck shining, lights on trailer is working too. The big grey box behind the cab is the automatic compressor. The cab can be tilted manually using a pneumatic hand pump and valve located under the second axle mudguards. Here you see the Servo-motor and valves controlling the last axle steering. Created a small problem though, the distance to the axle makes it use up too much air for the compressor to keep up the pressure. Patience is needed when doing driving around waiting for the axle to steer. Here is the first axle suspension. Air suspension reinforced with a spring to keep it from sagging. The cab is to heavy to lift with the compressor. The second axle suspension. Almost the same as first axle, but different chassis width and prop shaft required a small modification. Here you see the pump for cab tilt too. Third (and fourth) axle suspension. Air suspension here as well. And finally the fifth axle. Air suspension all around You can also see the pneumatic hoses for the steering. I just realized that the steering mechanism for the front axles are on the other side of the truck I will take some more pictures of that when I disassemble it. That's all folks. Hope I didn't miss anything else, otherwise that too will be reported after disassembly. All pictures from this photo shoot can be found in my Brickshelf folder once moderated. Thinking about the video, not much to show really with it sitting static on the table. Are you interested in it anyway? Happy Building Becca

Hello everyone! I'm back from a brief visit on the dark side. Holy moly! Time flies darn quickly sometimes. I can't believe it's been almost a year since I last gave you an update. If my memory haven't failed me, this monstrosity was completed in March last year and have since then been collecting dust on my desk. I've been busy doing nothing at all since then. Not alot have been done in the way of MOC:ing, but some technic sets have been built now and then. This creation has been constantly on my mind though, it's been to much of a bother to get it photographed. Today I finally got my bum out of the seat and cleared my room enough to expose the truck. (My nose itches after brushing of almost 10 months of dust.) I got my desk rigged for a photoshoot. But first I want to ask you, any special request for detail shots? And before you ask, I will try to make a video, but due to space constraint there will be no driving around, hope that won't disappoint you. As a consolation, (hope I don't bite of more than I can chew here) is there anyone interested in photo instructions of this beast? No matter what, this behemoth will be disassembled after the photoshoot. The pieces will be counted, so I might as well give it a try. Hopefully pictures will be up tomorrow. Happy building! Becca

Hi Kumbbl, I bought some hose for my WIP last month. Polyurethane though, I found the prices too high for silicon hose at the lengths I needed. I got 20m hose for about 6.5 euro from Elfa.se (Distrelec.de) instead of 2.5 euro/m at blokbricks. Only comes in lengths of 20 or 100m though It suits my needs consisting mainly of transporting air long distance through a rigid chassis. I'm sure it would handle moving joints pretty well, but I haven't tried it yet. There are a few drawbacks with polyurethane however: 1. Being a plastic material makes it harder to mount and dismount on the pneumatic parts, might be a problem when mounting in tight areas. 2. While flexible, it isn't as flexible as silicon hose. 2L radius curve instead of 1L. For the price I think it can't hurt to buy it. Becca

I don't think that there is a new part there. As far as I can tell the suspension arms are 7L beams with 44809 between them to limit suspension travel.

Hi everyone @unimog123: Let's see.. For drive I use 2 L-motors, steering 1 M-motor through a wormgear. I use M-motors for front and rear walking table, support legs, loading ramp and pneumatic compressor. And servos for the pneumatic valves. All powered by a single rechargeable battery box. @EyesOnly: It is quite a hassle to move it around. There are only two spots where I can lift it whole without risk of breaking parts, I have to take hold of the chassis between the front axles and then grip the trailer connection from underneath and support the trailer on my arm. I try to work as much as I can without moving it, the strain on my arms makes me reluctant to lift it. I have yet to weigh it @Milan: Yes, it looks that way. On this scale it would just look weird built any other way, besides, I am not used to thinking all the steps ahead required to build "super car style" with panels, flex axles and complex geometries. So much easier just to stack pieces Progress on the truck has been mostly details, nothing big enough to warrant photos yet. A pneumatic compressor have been built into a "gas tank" to be placed behind the cab. The problem with controlling the valves is also solved, pictures come later in the post. Regarding the harvester, I am afraid to report a loss of interest in completing it. At the moment it will just be remote controlled steering and driving by NXT. If anyone is interested in helping me program it and a remote, let me know. I am still a novice on NXT-programming Here comes some pictures of the valve control. I have made an LDD-file of it and the compressor. I think it is easy to see where the missing pneumatics and servo-motor should be. Happy building Becca

Glad you like it. I don't remember how much i paid for them. I got four from the Unimog and then bought eight more from Lego Service.

The pneumatic control is starting to give me a headache, and I am waiting on some parts to complete the truck. So I decided to start working on something to transport I have choosen to build a Gremo 1050h harvester. At the moment I got a simple mockup just to get a feeling for the size. I know the wheels looks a bit too small, that's because they are. The power puller wheels would be a better match, but I don't have any, and buying eight of them is just too much money Anyways, the plan is to make it drive and steer remotely via NXT and the crane might get powered via a gearbox and some PF-motors Happy building Becca

Thanks for trying to help. To clarify, both valves should control the same cylinder so that the cylinder is either extended, retracted or free-floating. It is for the steering of the rearmost axle, if that helps you get the right mindset.

I am glad you all like it I have no trouble at all with power to drive it around, got two geared down L-motors under the cab. The problem is with the steering. The steering uses linkages, just like the real thing, and coupled with the four-bar linkage suspension it rather push the axle than turn the wheels under all the weight. Regarding the cab, it went alot easier than anticipated getting the shape right. More time will be spent making the details right later. Will try to make an accurate interior as well. Now, I would like some help. I need to control two pneumatic valves on one receiver output. When off, both valves should be in one end position. When forward, one valve should change position. When reverse the other valve should change position. Both should return again when off. Does this make sense? If not just ask and I will try to clarify. My mind have been stuck on this for some time now and I would really appreciate any help you could give. Happy building Becca

Hello everyone. I've had a busy fall with no time for lego. Finally got back to it just after Christmas. I am happy to report some progress have been made on this project. I started with building a new cab. My goal was to make it more accurate than the old one, it was too square and wide. Here are some comparison photos of the two: The old cab was a P-series, the new one is an R-series so it's taller. I believe it looks alot more like a Scania now. This is not the final version, but it's mostly details that got changed. The rest of the truck have also been worked on. Lots of thought spent making it work like it should in the limited space I've got (still almost no space to hide things in ) I've lost some hours trying to make my brain wind down, be quiet and stop thinking lego enough to make it possible to fall asleep Anyways, here are some pictures of the truck where I left it yesterday: And finally a photo with the 42009 just for comparison: Sorry for the chaos in the pictures. I don't have much space available for a clean photoshoot at the moment Happy Building Becca

To clarify, the Dunderbygge will be only IR controlled. Meaning I might have no channels left for a second model, a forwarder. I thought about using a NXT for the forwarder with two motors for drive and one motor for articulated steering. I got a secong NXT to use as a remote.