Ivan_M Posted May 14, 2019 (edited) Let me introduce my latest build: Truck with concrete pump Introduction I got the inspiration for this kind of truck very long ago from this spectacular build from Waler: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=558238 . It was one of the first builds I saw when my dark age ended and I kept returning to it ever since. I knew I had to build my own when the time is right. I tried it once already (not published) in smaller scale 3 years ago but I wasn't skilled enough, the scale was wrong and I lacked the parts. I hope it is better this time. I also knew that I want to build it with very different features, Waller's truck if fully RC and I have found out that I prefer single motor and gearbox and steering and drive. IMGP5397 Features & build The list of features I wanted to implement were clear from the begining - full suspension, one motor for 6 functions, 3-section pneumatic arm, gearbox with two way switches and modular build. I wanted similar build/experience like Arocs so I have borrowed few features from it, most important is the way how the 3 modules (front axles with cabin and "crane", central gearbox, rear axles) are connected together. So I took the size of the gear box and its attachment points from Arocs and made my own one within the limits. Later I had to drop the 6th output that was supposed to drive some sort of lever ("pump") inside of the hopper because of complexity. The first iteration of the gearbox was quite fine, but it struggled when the long outriggers were hood on it because I have used clutch gear before the whole gearbox. That was major flaw so I had rebuild it again (almost) from scratch and even managed to add second penumatic pump to it. Each function is proteced either by white clutch gear, rubber band or LA clutch. The gearbox is powered by one L-motor which is powerfull enough to drive everything. Concrete pump gearbox There are two switches on either side between the axles, on right there is switch for spreading outriggers and extending front ones, on left there is switch for lowering them and for pneumatic pump. Switch for arm rotation is under the turntable. The X-style outriggeres are as close to each other as possible. The problem is that the gears for the 4 mLA that spread outriggers have to turn in opposite direction on left/right side AND in opposite direction on front/rear side as well. You can probably see more from picture above. IMGP5404 IMGP5401 Rear axles are build in similar way like on arocs, the difference is that the springs are serured much better and there is build-in 1:3 reduction. Front axles are live axles with ackerman geometry and different steering angle. I'm really happy how they turned out, the spring is mounted to lower suspension arm so I was left with more space on chasis. The steering angle is very high at the cost of force required to steer. It is necessary to drive by one hand and steer by other one, the model is very heavy and steering at place is not very convenient. Rear axles are connected to V8 engine under the cabin. IMGP5414 The cabin can tilt to reveal engine. there are two seats (of course in blue), dahsboard, gear stick and two pedals inside. I have also added screen wipers and all mirrors. Arm is 3 sections. This was real science to make it as long as possible and light so the pistons can lift it. I have moved the pistons that operate 2nd and third section to opposite direction of the arm. This prooved very effective as it allowed me to make both sections at least 10 studs longer. I also wanted tubbing as nice as possible and thick tube for concrete as well. IMGP5406 IMGP5409 Full gallery: https://flic.kr/s/aHskUypnbW Video Instructions Yea, they are on the way Edited May 14, 2019 by Ivan_M Share this post Link to post Share on other sites
Maaboo35 Posted May 14, 2019 Brilliant stuff, Ivan! Very interesting use of pneumatics. Share this post Link to post Share on other sites
Cyber Master Posted May 14, 2019 Looks really good! I just had to deal with a real one ~5 hours ago ;P Share this post Link to post Share on other sites
Jurss Posted May 14, 2019 I like it. especially how You made that concrete tubing. Does those plates (4L, 3L) really hold connection? Especially at the connection to pneumatic cylinder "axle" end? Share this post Link to post Share on other sites
Ivan_M Posted May 14, 2019 2 minutes ago, Jurss said: I like it. especially how You made that concrete tubing. Does those plates (4L, 3L) really hold connection? Especially at the connection to pneumatic cylinder "axle" end? Thank you, the availablility of those 90° round tubes were the reason I started this project, they look splendid. Do you mean plates holding beams? It is very sturdy connection, to the point where 6L plate is too much to disassemble without big force Share this post Link to post Share on other sites
Kio Liex Posted May 14, 2019 Impressive, I like it. Looking forward to the instructions? Share this post Link to post Share on other sites
Lakop Posted May 14, 2019 Great work. I ilke your piping work. H Share this post Link to post Share on other sites
Mechbuilds Posted May 14, 2019 Brilliant work! And you're a true legend for sharing instructions to this behemoth! I love the little detail of using a chain for the cabin tilt mechanism limiter. Share this post Link to post Share on other sites
jorgeopesi Posted May 14, 2019 I liked a lot and I recogniced the music from the begining , I used the same in my Komatsu. Spoiler Share this post Link to post Share on other sites
BrickbyBrickTechnic Posted May 14, 2019 This is another one of your classically amazing MOCs. Awesome job on this build! Share this post Link to post Share on other sites
grum64 Posted May 14, 2019 Great build. We had one of these towering over our house yesterday pumping concrete to a neighbours property. Share this post Link to post Share on other sites
AFOLegofan66 Posted May 15, 2019 Fantastic build and great job on the pneumatics...looking forward to the instructions!! Share this post Link to post Share on other sites
Jeroen Ottens Posted May 15, 2019 Fantastic looking MOC It almost looks like a real set (only the connection with plates in the beam would never be made by LEGO, but then again, they would just make a special part for this connection). I really like the wealth of features, the complicated gearbox and the colourscheme. And knowing the quality of your instructions I am sure they will be as good as this model. Share this post Link to post Share on other sites
MangaNOID Posted May 15, 2019 I really like your MOC's you make. That boom arm stays so straight when when fully extended it looks fantastic with such minimalist design. the pneumatic switches look a little hard to get to perhaps but didn't look like too much difficulty in the Video. so many functions in the one motor is splendid. that gearbox makes my brain hurt. Share this post Link to post Share on other sites
Ivan_M Posted May 15, 2019 (edited) Thanks everyone for your kind words. 21 minutes ago, MangaNOID said: the pneumatic switches look a little hard to get to perhaps but didn't look like too much difficulty in the Video. it is quite fine, the two switches for lower sections are on sides so they are very easy to reach, only the switch for 3rd section is more difficult to reach. I wanted them above the turntable because in that way only one pneumatic tube goes through it and rotation is not very limited, it can even perform 360° turn without blocking it \\edit: I'm working on 3D model and once it is complete I will post colored details about all functions Edited May 15, 2019 by Ivan_M Share this post Link to post Share on other sites
MajklSpajkl Posted May 16, 2019 Fantastic! Superb idea to move pistons to the begining of each section of the arm. I kinda envy you as I always wanted to try this one, but never got the balls to tackle the problems of making it. Well done again! Share this post Link to post Share on other sites
Ivan_M Posted September 28, 2019 The instructions are finally alive: https://rebrickable.com/mocs/MOC-29716/Ivan_M/truck-with-concrete-pump/#comments It is whooping 570 pages, the build is split into 5 sections with central gearbox and outriggers, rear module, front module, cabin and arm. It consist of 4120 parts, something I did'n expect, I thought it would be closer to 3000. Share this post Link to post Share on other sites
jorgeopesi Posted September 28, 2019 Great instructions what program did you use?, making instructions is almost more difficult that finishing MOCs for me . Share this post Link to post Share on other sites
Ivan_M Posted September 29, 2019 10 hours ago, jorgeopesi said: Great instructions what program did you use?, making instructions is almost more difficult that finishing MOCs for me . LDCad for stepped 3D model and then LPub. While LPub is sometimes very painful to use the amount of customization of final look is why I still use it. I find it quite joyful to make instructions and I can do so quite quickly Share this post Link to post Share on other sites
