Search the Community
Showing results for tags 'pneumatic'.
Found 131 results
-
Hello everybody, during this holidays I purchased the 42081 and decided to build it a little different. First, I made some minor changes in design, to look a little more similar to the "real" Zeux. I changed some color here and there; the yellow panels in the middle are different; the placement of the "02" adhesives is on the lower DBG panels instead of the upper ones. But the biggest MOD was to add the pneumatic system, with motorized pump, instead of manual LAs. The valves are located on the sides of the loader, 2 on the left and 2 on the right. There are 2 big cilinders (to rise the arm and the rear axle) and 2 medium (old) cilinders, to operate the bucket and the counterweight. Here you can see the last cilinder, the pump and the motor, located below the battery box: And here is a short video:
-
Probably already done to death, but meh: pneumatics are cool. Here are two air pumps I keep on my shelf for boosting some of my models. The focus is on compact and minimal but also functional design. The first is for first-generation, single-ported pneumatics. It's just a small cylinder connected to a geared 9V motor with a pair of wheels as a crank. Next up, one for the dual-ported system. This one has two blue pumps set 180 degrees apart to smooth the airflow, driven 1:1 through 16-tooth gears by a PF XL motor.
-
Yesterday I got my 42080 and of course at first I had to test the new Pneumatic parts. Beside the new valves there's a modified pump 6L in the box. It seems it is so new that it isn't printed on the box :) The modification of the pump is just the outside. Function is still the same. But more important: The new valves. My hope to get a valve with continuously usable lever is broken. The new valve acts mostly like the older ones. Bad news for using with Servo motor: The level goes only 45 Degree in both directions. But, and that is new, it seems to me that there is a new position between "on" and "off" on which the valve throttles the airflow. Maybe someone can test and confirm this. That's all so far. I also made a video showing the new valve in detail.
-
https://youtu.be/UFPNWZeeXQw Lego Pneumatic Engine. What is it? How to make it? The first it needs to finish Lego fake cylinder like in this video https://youtu.be/HcHneyewATE or https://youtu.be/0aZvWva41Ek. The second - to add o-ring to Lego piston like in this video https://youtu.be/wZu-l32Dajw or .
-
Time for a dedicated topic as well. Link for high res image: https://mega.nz/#!qDQh2aZC!9L0SMGXuq9L_1oSgaaj20bn-H47tcH2jS8gCeEgJlFM This is the ultimate color barf that TLG has managed to produce: - Lime - Green - White - Yellow - Black - DBG - Red - Blue - Medium Azure - Reddish Brown Discoveries: - If you zoom into the cabin you can see a water bottle with a silver cap - There is a 6L towball link bar under the front row of wheels.
-
I have been working on this project for what seems like forever. I'm happy to have it done. The full gallery can be found here. Much more at thirdwigg.com. Full Lift With TLG Balloon Tires Chassis
-
This MOC was built after 2 other attempts, 2 years ago and these didn't work. (I can explain a little the reasons if someone is interested) The design was difficult to do because of the round shapes. But I think the result is so good. You tell me ! The functions are : Left track Right track Blade Rotation of the turret 1st section of the arm 2nd section of the arm Moving the bucket Rotation of the arm (right/left) Opening/closing the clamp (pneumatic) All the functions are powered by M motors, except the rotation of the turret. But there are 9 functions, and it is possible to control just 8 functions with the IR system. How it's possible ? It's quite simple ! A gearbox allows to choose between "rotation of the arm" or "opening/closing the clamp". The chassis is very compact. It has 4 motors and 1 IR ! The mechanism of the rotation of the turret is not visible (the turret is too compact ! ^^) The rotation is quite fast (not too slow). Here you can see the motor actioning the 1st section of the arm. The motors of the 2nd section of the arm and the bucket are placed inside the arm. The last motor is placed in the middle of the chassis. It actuates the gearbox and you can choose the function to activate. With the clamp, there are a bucket and forks.
-
After seeing @jwarner's excellent smalle crane and @Ludo Visser's WIP on a good looking undercarrage, I kept being reminded I still had one of these on my "to-do list". It's the last (I think) in what turned out to be a series for me of small versions of vehicles that are usally the big 4 "flagships" in Technic that return every couple of years. It features: - Boom lift by pneumatic cylinder - 1 stage boom extension - Rope (with old school 90's lock and also a hook from the 90's ) - 3 axle steering with different steering angle for the front wheels (bottom 12T bevel gear at the rear) - Working V4 (allthough a little out of sync, can fix that as soon as Lego actually makes parts to shift direction at this scale on 1 stud instead of 2 ) - Cabin tilt on the superstructure (through a worm gear controlled by 12T bevel on top) - Superstructure rotation (top 12T bevel gear at the back) - Outriggers (couldn't fit a central operating method so they are moved at the rear through the LBG crank shaft parts usually used for fake engines) Stuff I couldn't squeeze in no matter how hard I wanted to: - 2 stage boom extension (with 11L thin pneumatic cylinder). I tried, but with ropes in play I was looking at a 2 studs wide crane without a shell to give it ridigity, anything with 3 and 4 studs in width with the shell still felt very flimsy. And shortly after switching to a 1 stage boom with these 11x3 panels I really started to like that clean look on the crane vs the thin liftarm extravaganza I had in play earlier - A diff (or at least have the fake engine run in some form on both non-steering wheels). I barely managed to get 1 wheel driven. Had to use some ancient 90's Space Shuttle technique with a rubber band to get the stuff routed. I considered a blue clutch gear from the Chiron on the steering shaft, but besides that really killing my ground clearance it wouldn't fit up top thanks to the pneumatic cylinder. Why not leave the feature out? Can't do that when all the other mini's I made had fake engines. It was this or never getting finished pretty much - And as mentioned earlier: the outriggers being controlled by 1 knob. Couldn't route it to the rear, already crowded, the cabin in the front was blocked by steering angle of front wheels and crane up top. I am happy though that they at least can lock into place and lift the whole vehicle. And a couple of more images: Instead of messing with the length of the hubs on the 2 rear steering axles to get different steering angles, I shortened the front steering hubs by 1 stud to get a sharper angle with space lost in height (rear of the driver's cabin) but not in length. It's turning radius is pretty sweet, very small. Tried to get some details in the cabin, but they are missing half of their bottom seats thanks to the steering wheels. Also messed around a little with options to get the outriggers folded into the body as much as possible, not sticking out more than 1 stud up top and when extended looking at a decent angle. Hmmm, now that I am looking at this picture, perhaps I should swap the 4L thin levers for LBG or something to make the fake engine "pop" from the black chassis. Anywho, thanks for watching and reading.
-
Hi everyone! Not long ago I finished my latest MOC. And today I finished the corresponding video. So it's time to show it here. Shortest description would be: Stewart platform for Ideas set 21306 „Yellow Submarine“. The longer description is: It's a MOC I built around the Ideas set. It's a fully working stewart platform powered by two pump compressor and controlled by two joysticks. Everything is working pure mechanically and with pneumatic. For better look I used system bricks for the control tower (with female naval engineer) and the housing of compressor and control center. Components: 1x PF L motor 1x PF M motor 1x PF LiPo 2x PF switches 6x Pneumatic V2 cylinder (small thin) 2x Pneumatic V2 pumps 6x Pneumatic Valves some PF cables Looking forward to reading your comments. Best jrx
-
how do i steer pneumatics whit ev3 ?
-
This topic is for pneumatic tips and tricks, how to use pneumatics and mocs including pneumatics or just general things about pneumatics. Ps mods if you feel this topic is not required feel free to remove. I just made this seeing there was no general discussion on pneumatics.
-
Hello there! I ran into a small problem recently. I'm trying to synchronize a couple of pneumatic cylinders which are not connected directly to the same frame and they keep extend and retract at different speeds. The hoses are exactly the same length and the cylinders are from the same batch - they are not old+new. But even if I get the synchronization correctly then one of the cylinders does a harsh or abrupt action. For example when the pressure in the system is rising one cylinder starts to operate right away and the second cylinder is "stuck" until the pressure is high enough and it extends abruptly. I've spent couple of hours manually extending and retracting cylinders in order to make them work smoothly without success. Did you have such problem and if so - what was your solution?
-
Hi everyone, For the past year, I have been working on this MOC, making very slow progress mostly due to a lack of time. About a month ago, I finally reached the point where I considered it finished. It's not perfect and many things can be improved, but I am happy with the current state. Enough to finally make some pictures and a video. The MOC is based on the Manitou TMT 25S. It is a hydraulic forklift, one that hooks on back of trucks, but uses an unusual design. A picture from the original: It also combines some interesting hydraulic functions which I tried to carry over to my model. In the end, this is the list of functions I managed to implement: Manual steering, control placed at the back, behind the cabin - rear wheel goes 360 degree. Pneumatic compressor using an M motor and two pumps Electric switch to control the compressor Pneumatic functions for: Boom elevation Boom Extension Fork control Front outriggers Boom lateral adjustment Initially, my intent was to have an auto switch for the compressor. However, after many trials, I could not calibrate it properly so that enough pressure remained in the circuit to control all functions properly. The switch would not always return in position when the pressure was dropping, making some functions such as raising the boom unusable. So I replaced the assembly with a manual switch which can easily be controlled when air is required. To smooth out the functions, I used an air tank which is hidden below the control valves in the back. Overall, the functions are working well. The main issue is the control of the fork, which really needs better smoother valves to have finer control. Also, since it is pneumatic, It does not maintain its position when elevating or lowering the boom. I could not find a way to do that while keeping the boom extension which is required. So here are the video and pictures. I hope you enjoy it. More pictures are visible on the BrickSafe folder: https://bricksafe.com/pages/Minique85/manitou-tmt-25s
-
Hi, Can someone please tell me if there is a practical maximum hose length for a Lego pneumatic system? The application I have in mind is for ‘remote switching’ of a railway track point. The track point is ~1500mm from where I want the switch. I presume I would be best to use 3rd party hose at these lengths. I’ve tried to search for an answer, but nothing has turned up. Can anybody here help? thanks david edit: ps, I am probably going electrical, but just thought I’d consider a pneumatic solution, though it appears in any case parts for that may be difficult to source.
-
This MOC came about from my wanting of a super compact all-in-one Lego compressor, and after trying many different auto valve designs (and about a week of building), this is what I came up with: Video: Features: Air tank Automatic pressure switch M motor and 6L mini pump compressor Very compact 15 x 11 x 7 stud size Easy removal of battery box Pneumatic tube lengths: 1x 3L (2.4cm) 2x 10L (8cm) 1x 14L (11.2cm) All the pneumatic tube lengths listed above (and most of the other parts) are available in 8110-1 Unimog U400. Instructions are available on Rebrickable. The compressor uses a single 6L mini pneumatic pump, but can easily be modified for two pumps. The automatic cut-off pressure can easily be adjusted by changing the strength of the rubber bands attached to the pneumatic cylinder.
-
[MOC] Ultimate Volvo EW160E - instructions done
Ivan_M posted a topic in LEGO Technic and Model Team
EDIT: Finished pictures and video: Finished model Finished model Finished model Finished model Finished model Finished model 42053 is very nice set but I cannot justify buying it when I have all the necessary parts in my collection. In the end I tend to be dissapointed by the official sets due to my overexpectations. So I decided to build by own Volvo wheeled excavator. As usually I build in scale to blueprints, this time the setter wasn't wheels as usually, but length of the main cylinders. This is primary to achieve the best movement range of the arm. In the end the wheels 49,5mm fit precisely and the scale is (my usual) 21,5:1. Width is 15 studs like in the set, wheelbase is 15 studs as opposed to 17 studs in set. I want it to have 7 pneumatic features: 1) bucket emptying 2) arm movement 3) + 4) two piece boom 5) cabin lift 6) front blade 7) rear outridges Additional features: 8) front pendular axle, steered by HOG 9) superstructure rotation by knob I started with the arm and 2-piece boom. The bucket is by far the biggest drawback of the build with its poor shape and mounting points. I have considered other buckets (I have all TLG produced) but this is the best out of bad. Maybe I will try to build better one from bricks in the end. Everything in real machine is very thin when translated to my scale so the arm is build from technic bricks, arm is 1 stud wide with some plating on sides for looks. The two section boom was quite a challenge due to width. I started with dual thin cylinders at the base but they struggled to lift the boom when it was in full reach. The whole boom had to fit within 5 studs so the first section is actually 2 studs wide and second section is 3 studs wide. Fortunatelly it is not very visible because it is covered by cylinders. The arm movement range is very similar to real machine, the only angle that is smaller is between booms due to the length of the old pneumatic cylinder. The next step was undercarringe. This was quite difficult as well, mostly rear outridges. The range of movement for small cylinders is very low and it had to fit in very little space. The reach is not perfect but it is acceptable. They are weak as kitten of course, fron blade as well, but I wanted them operated with pneumatics. There is also drawball connector to mount trailer behind the excavator. The front wheels use my usual setup with small hubs for great turning radius and ackerman geometry. The disadvantage in this case is that the wheels are mounted "wrong" way, with the shallow part facing outwards as opposed to rear. I can live with that however, I just cannot build without ackerman anymore. Last thing I have is the cabin. It is also 6 studs wide as in the set and it is quite similar to that one but more detailed. I have added brick build front lights and some greeblings. The roof is supposed to be yellow of course, I don't have the bricks yet. I'm now working on body. WIP - Arm reach WIP Arm folded WIP - Arm reach upper WIP - Arm reach lower WIP - Cabin WIP - Cabin -
[Idea] Link Two V2 Pneumatic Actuators End to End.
Saberwing40k posted a topic in LEGO Technic and Model Team
So, @Fieldtest requested a device to link two of the large V2 pneumatic actuators together, end to end. this is what I came up with, and it is so potentially helpful that I thought it would be worth sharing in its own topic. Pneumatic Cylinder Connection by Saberwing007, on Flickr It's pretty easy to make, but it was a real pain to figure out, because Lego, in their infinite wisdom, made some of the dimensions not a whole number of studs, which is really odd for them. Thus, this build needed some very illegal connections in order to work and be stiff. I've also got some more construction pics: Step 01 by Saberwing007, on Flickr IMG_20171214_180212047 by Saberwing007, on Flickr Step 03 by Saberwing007, on Flickr There you go, I hope you all find this to be useful. -
Compact Pneumatic Excavator + My own sketch
Aventador2004 posted a topic in LEGO Technic and Model Team
Hi all pneumatic lovers! I got a kit of pneumatics a while ago, but haven't fully used them. Today is the day I show where they are headed. This is built to teach other people about excavators and pneumatics. Pneumatic pump (exhaust pipe) Pneumatic arm lift (2x11) Pneumatic dipper & curl (1x11) Cabin Access to hoses Tracks Spinning turntable (infinite rotation) Hope you like it as much as i do, and here is a hand drawn sketch I Made specifically for it. before you ask, yes i reprinted it. Who doesn't want the original. And now the model: Panel removed: Reach capability: Love it or hate it, i would enjoy to here what you think! -
Need Help Replicating Historic Engine System
GeorgeCrecy posted a topic in LEGO Technic and Model Team
Dear fellow LEGO enthusiasts, I am in dire need of some help from you folks who are definitely more knowledgeable than I. In this case, I am needing help with the replication of the RMS Titanic's Reciprocating Engines and Turbine. I am in the midst at the moment of working on the project below, though I have not updated it in a great while due to university work. See this link here for the project thread. But this is a minifig scale project, with every door, every window accounted for. This means that in regards to the engines, I am also seeking to make them at least somewhat true to scale and able to work as intended. Obviously this is a big job of some top notch Edwardian-era engineering, but I am hoping that there might be some out there not as technically-challenged (pun totally intended) as I am, willing to help me get this part of the project off the ground. Some of the features I I am looking for include a fully air-powered system, where the air supply would come from tanks hidden in the mock-boilers, that are then funneled at somewhat high pressure to the Triple Recip. Engines, which means that the pressure would go down as it goes through each cylinder (HP, IP, then two LPs). The leftover air at a much lower pressure then goes to a junction that can either go to the Parson's Turbine at what was historically 4 psi, or can go directly to the condensers. With the latter I intend just to make the outside of it and hide inside some custom compressors like this. That would then return to the original air supply. With this I am hoping that I will have a self-supplying system with ideally no more than 5% leakage, or enough compressors that leaks are compensated for. WIth the Parson's Turbine, that can be an accurate shell with whatever is needed inside to include a working turbine, and probably with an gearbox and ascending set of gear ratios to give it the necessary torque. These engines and turbine are meant to actually turn the propellers, perhaps even in water! Some other features would include a replica of the Brown-type reversing engine on the side of each of the Recip engines, making it so that the Stevenson-type eccentrics can change the direction of rotation. Considering the scale, the reversing engine doesn't technically have to be much more than a slightly-hidden piston that does the required job, but any more realism doesn't hurt. If something like this is possible, please let me know. I am really wanting to continue with this project, and this is a central part of it. But without the pieces in front of me instead of on a computer screen, what little I know of engineering definitely doesn't help without that tactile interaction. Thanks for your time, and I look forward to your replies! If it is possible, then I can follow up with the intended dimensions. Here are some references for any that wants some: View of turbine and condensers through wall from main engines rotor shaft model of port-side recip. engine overall basic view path of the steam of original, pressurized air for mine -
[MOC] 8x2 Truck w heavy duty crane + instructions
Ivan_M posted a topic in LEGO Technic and Model Team
I would like to share my latest creation - 8x2 truck with crane. This is the picture that inspired me: I started with cabin and chasis and I was not sure what kind of truck I want in the end. I was sure about one thing - not to make overcomplicated build so 8x4 dump truck was on my mind for most of the time. But then I have seen a website with cranes and the one above is very nice so it was set. I love pneumatics so this was an obvious choice. I have of course took the picture as purely inspirational, this is not meant as exact copy. Features: 3 steered axles, each with different ratio and all of them with ackerman geometry - I just love the small ball joint hubs. 3rd axle drives fake V6 engine (1:3 ratio) cabin with openable doors, openable front grill and it can tilt to reveal engine extendable outridges (6 studs), all operated simultaneously by knob behind the cab and pneumatic foots. They can lift the whole truck but they bend under the weight. 3 section crane with extendable 3rd section and winch. The crane itself is quite powerful, the limit is the winch. Slew is controlled by knob behind the turntable. huge amount of tubbing, almost 3,5 meters IMGP5104 by Ivan Moc IMGP5107 by Ivan Moc IMGP5108 by Ivan Moc IMGP5111 by Ivan Moc IMGP5112 by Ivan Moc IMGP5114 by Ivan Moc IMGP5115 by Ivan Moc IMGP5116 by Ivan Moc -
Hi All, I know, I have unfinished projects enough (published here too), but time for another long-term build. I was lucky enough to find great deal on pneumatic cylinders, and finally I own Claas tires too, these caused to raise the Skidder-particle ppm in my haemodinamics. This is a very old plan of me, basically since I got back from my dark-age with the 8265 in 2009. So this is the plan: http://www.tigercat.com/product/630e-skidder/. I will not build a specific model, but a generous one (610/620/630/632 mixed style), because I am not that much interested in specific models - simply: I love them all (and beside that I am afraid of @M_longer's justifiable criticism ). Finally I found a working design for the grapple with nice range of movement. It has virtual pivot points, and floating cylinder (this is already differs from real-life counterparts), but I wanted to use 1 cylinder only due to tubing - which should be nicely hidden in the boom panels. Some might be not a fan of the Bionicle parts, but I find them right here, and they tend to close properly due the lucky combination of build slack and their pointy-thin design (I might figure out an offset for them, but wasn't successful yet). I made a pure Technic version too, in case. This is how it looks so far (partly built in bricks too - waiting for parts), with Power Puller tires in the model for the scale: Still a very long trip ahead, and I am not fast on building, but I feel passionate, which is a promising sign I guess. Special thanks to: @Lipko for inspiration and for the pneumatic parts in LDD from his majestic Backhoe, @nikolyakov for the beautifully purpose designed and inspiring TC10 entry, @BrickbyBrickTechnic for his 42054 C-model as final motivation, and for Bricklink to make it feasible to emptying my wallet... Every suggestion, criticism for improvement is welcome.
-
NEWS of 12-11-2017: I have been invited by Ropa Maschinenbau, to join them at Agritechnica in Hannover Germany with my Ropa Maus 5, and my Ropa EuroTiger 4 XL, the coming Thursday and Friday the 16-17. in Hall 25, Stand G14. Come and have a look if you plan to visit this exhibition. Hi Guys, long time no see. Bondemand Clausen is back with some farming equipment. It is a Ropa Maus 5, which is used for cleaning and loading sugarbeets onto trucks or tractor wagons. This MOC is build in Scale 1:16, weighs 8 kilo. It has been presented at Lego World 2017, Copenhagen, and Skaerbaek Fanweekend 2017. First pictures shows the Machine in transport position. Unfolded and ready to work. It has 23 motors, 13 Servos, 2 XL, 3 L, 4 M and 1 Micro. They are controlled by 6 Sbricks, via Ipad. 10 of the servos controls pneumatic valves, powered by 4 pneumatic pumps. It has 11 pairs of PF LED lights. The real machine the Ropa Maus 4, Cleaning and Loading my Sugarbeets in 2013.
-
I am getting close to the end of this long term build and it's time to share some pictures and a bit of the story. Even before I had finished putting together 10231, I decided I wanted a Crawler to go with it. Being a Technic fan it had to at least drive around and lift the launch platform and shuttle. Those two basic goals spawned a project that has lasted a little over 2 years so far. Some ideas have stuck around since their inception, others were a bit optimistic (like building a peristaltic pump and hoping I could find a way to control the pneumatics hydraulically). February this year marked the 50th anniversary of when the two crawlers went into service, so recently there has been extra motivation to finish. The base equipment; - 16x M-motors (drive) - 4x L-motors (pneumatic jacking and leveling) - 4x IR Receivers (V1 as the V2s do not like driving multiple m-motors on a single channel) - 4x NXT servo motors (steering) - 4x RCX rotation sensors (measuring jacking level between truck and chassis) - 2x NXT bricks (one master and one slave. The master communicates with the Android Tablet and coordinates itself with the slave. Programmed in LeJOS) - 1x PF IR-Link sensor (link between master NXT and all PF motors) - 2x PF Battery boxes (with thermal overload removed) - 1x Android Tablet Future add-ons - Accelerometer (automatically detect the crawler is on a gradient and adjust the leveling to suit) Bricksafe folder is here: http://www.bricksafe.com/pages/OzShan/Crawler Firstly, a couple of my favorite reference pictures; The build itself started with the trucks, thinking that the pneumatics and LAs would dictate the scale. First proof of concept - build a coupling to give height, pitch, roll and yaw to the truck. The pneumatics need to be on their own gimbals too. The reinforced 2x2 rounds slide and rotate in the 4x4 macaroni's. It is on the limit of what will hold together without glue, but it does hold. The two 1x2 technic bricks at the base of the 2x2 column are helped a little by a string (not pictured) which runs up through the 2x2 rounds with the axle. Initial prototype of the drivetrain. I would have liked a higher ratio but there was just no room at this scale. When the gearbox was married with the truck chassis I had to juggle positions, so you will see in later pics the crown gears are facing in not out Best laid plans.... Marry studded and studless they said. It will be easy they said... Showing what will eventually be the steering between chassis and truck. The guide tube and pneumatic cylinders are all on gimbals with the pneumatics coupled together. The average height is preserved during any tilting. With prototypes sorted, it's time to bricklink some parts and quieten down the colour scheme! (thank you 42030 for providing 5L thin liftarms with axle hole in LBG color) You can see the relationship between "guide tube" and cylinders here. The pneumatic system was overhauled too many times to remember but this is what it arrived at. It is all controlled by the direction of the motor. Running forwards drives the pump. When running backwards, the lobes operate the pneumatic valves in series, letting small amounts of air escape each rotation. This lowers the chassis in a slow and controlled manner. The motor can be turned on or off and run in either direction at any time due to the valve timing. Early attempts with PF Servo and NXT servo just couldn't park the valve reliably and after a few operations I would hear a slow leak. I have been trying to keep up with the LDD but it's hard to stay motivated when I know I'm just going to have to suck it up and move over to LDraw if I want to include all the motors, pneumatics and LAs Works so far; (I'll make the files available if anybody would like them). I found LDD essential in the early days to plan ahead and simply find parts, but later on the build overtook it. Original 'box' pump. 1x PF XL motor, 4x 6L pumps running at 90 deg to each other. Very smooth but bulky. Flatter attempt in the same vein. The truck itself. The final design for the height control modules. I hope you enjoy the build so far. More pictures to come of chassis, steering, leveling and interior details. I'll leave it to others to decide what 'theme' it belongs to .
-
Ive just assembled the arocs mercedez truck. Wow its big but the pnematics dont work at all. Pumps on, slight movement but not enough power to lift anything. How does one know if the pump is putting out or mal functuioning or valve mal functioning. Im frustrated a bit. Seems at best the pneumatics system is weak to begin with. Do the little blue pumps often cause trouble. It is a new set. Thanx
-
Hello everyone. I would like to introduce my truck with excavator. It is loosely based on Tatra 815 with UDS 114 (universal finishing machine). The real thing looks like this: I really like this type of excavator, its main advantage is high mobility because it can even go on highway. It is mainly used on road building and terrain shaping. My goal was to make pneumaticly operated truck, preferably playable by kids. I started with some blueprints and decided to use 49,5mm wheels that set my scale to roughly 21,5:1. I wanted it to look like an older truck, with low cabin and boxy design. The model features: - HOG steering by spare wheel at the back of cabin - Openable doors with decent details in interier - Fake V4 engine that is connected to rear axles, each with differential and with shock absorbers (~1 stud travel distance) - Pendular unsprung front axle with ackerman steering (~3 studs travel distance) - Pneumatic stabilizers that are able to lift the whole truck - Pneumatic jib with manual extension from ~40 to 68 studs - Manually operated bucket with 360° rotation The above is a result of many compromises - like V4 engine instead of inline 6 etc. It is not possible to fit larger engine into this scale, I tried mini fake engine but I didn't liked how it looks. What is most satisfying for me is the front axle with ackerman steering and pivot point nearly in center of the wheel. That allowed me to build very nice fenders close to wheel. The wheel doesn't touch it even in full turn radius and fully compressed. The rear axles are by Efferman, he used this design in his Kenworth crane. I really like it. Enough talk, some pictures: IMGP4963 by Ivan Moc, on Flickr IMGP4964 by Ivan Moc, on Flickr IMGP4965 by Ivan Moc, on Flickr IMGP4966 by Ivan Moc, on Flickr IMGP4968 by Ivan Moc, on Flickr IMGP4969 by Ivan Moc, on Flickr IMGP4970 by Ivan Moc, on Flickr IMGP4971 by Ivan Moc, on Flickr IMGP4973 by Ivan Moc, on Flickr IMGP4974 by Ivan Moc, on Flickr The weight of the fully extended jib is pushing the thin pneumatic cylinders to their limit. I wanted to keep thin ones at all cost because they look much better. I have redid the jib like 15 times, ending with studded one that prooved the best abilities in terms of rigidity, weight and looks. The battery box is there as counterweigh only. I had several versions with PF - to run compressor (not enough pressure to lift fully extended jib), motorized jib extension (took too much space from the extension),.. so in the end I threw PF out, leaving all functions as manual. The stabilizers were also quite challanging due to the angle and size, at least they have no problem lifting whole truck. I hope you like it.
