MSc Shobaki
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Everything posted by MSc Shobaki
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Here is a video taken 2 months ago explaining the front suspension module. Bare in mind that I removed the top differential for this project.
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I agree with you, I was inspired by Lucio Switch and then I "stole" measurements of a real truck similar to Iveco Stralis, but Scania. Since I have access to all their trucks I can get 3D-models of each truck they produce :)
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That's a nice, powerful truck! Really cool. My project though was a challenge set from my collegue. The goal: Build a realistic large-scale truck with LPE. Pack in as many technical functions to mimic real-life setups in that scale. Not only that the truck features leaf springs front and rear, it also has fully functional brakes with onboard compressor to operate them. Hmm, might wanna gear it down further. Alex, do you know what total gear ratio you had in your mustang?
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Thanks! I have tried many of Nicjasno's ideas and I find them inspiring. However, my truck is very heavy. In my setup I use a 2x 5L axles + 2x 7L half beams per side as leaf springs. They do the work pretty nice :) In the rear suspension, I use 4x 9L axles per side giving a semi-hard damping :) On Wednesday, I will try to make a video of it driving. It is really heavy, I think it weighs 5,5 kg as of now
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I did not understand what you were trying to say with the video. Could you be more specific? :)
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Hello dudes and dudets. Even though I have replied to some threads here and there,I haven't taken the chance to introduce myself. So here goes nothing: My name Leon Shobaki, 27 years old from Stockholm. Currently I have a masters degree in Advanced Machine Design from RTH (Royal Institute of Technology), you could have guessed it from my nick ;) I work at a daughter-company to Scania, so during my days I design different tools for truck manufacturing as well as plattforms and steel structures for heavy sorting machinery (>16 tons each). I'm also married with a Lego-freak :D here is some bad info though, I have Aspergers syndrome which makes me socialy handicapped and akward, as I very rarely understand jokes or ethiquettes. It is hard sometimes as people can think I'm just being rude. The truck I'm building: An Iveco Stralis 4x4 Trailer truck LPE I-6 scale 1:12 Engine: Own-built LPE Inline-6 Transmission: None, OWC. Total gear ratio Engine-->Wheels 3.88:1 Drivetrain: 4WD Suspension: Leaf springs front & rear Steering: Rod + Link Brake system: Pneumatic Disc brakes front, Pneumatic Drum brakes rear Compressor: Directional full pump Cabin: Lucio Switch's Iveco Tractor Extras: Doors with lock, 2 AA battery boxes, IR remote and tower, 40 third party LEDs. I have to fiddle with image upload, till then here are two youtube videos of if: Video of lights and rear brakes Video of engine cover and engine running @2-3bars More to come! Thanks
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That my dear is the best reply I have seen this far. Like you said, my comments were only made with the best intention. I can admit that the whole thing with my degree may have sounded like "IN YOUR FACE" and makes people feel small. My intentions were to encourage Zblj to develop the idea further, and I backed up my comments with knowledge from my degree and experience from real-life work. Facts and experience. But I never wanted to come out as rude or anything. I haven't posted much here on EB, therefore I dont think I have introduced myself. I will try to post a new thread with some info about me and my current WIP
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Like I said, my intention with my post was to Zblj to take it as constructive critisism from my engineers point of view. I did not call him nothing or even disrespected him for that matter. If Zblj wants to see the whole system as a toy or needs to base his work on slacky systems, that's up to him. My goal was to inform him about how his idea would not work in real life if we look at its mechanics. Even though you've built in with real lego parts, you are missing the big picture of what my goal was.
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Try to look at my critisism in a positive and educational way. What makes a LEGO-moc interesting? The complexity without sacrificing stiffness to deliver certain functions. In other words, I don't find your concept to be interesting as you have an idea which relies on the slack/play in the parts. To me, it sounds like you need to develop your idea further. Even though you have many ideas to implement, you need to develop them further. Now I might sound negative and harsh but I just want you to aim higher. Instead of just relying on slack or building without respect to mechanics, why don't you build sturdy complex designs that have proper stiffness and deliver the functions that you want? Personally, I'm not a fan of using parts to things they are not designed for nor integrating the parts to deliver a function that would introduce stress which in turn results in breaking.
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Being an M.Sc in Mechanical engineering, my question may sound harsh but anyway: What is the point of having two frames with torque ball joints? Here are some thoughts of why I'm not impressed 1. You lose the whole function of the ball joints since their job in your design will only be to move up and down in the center of the u-joints. As long as the ball joints move up and down, it is fine. 2. Adding a second torque ball frame like you have done will result in locking the whole rear axle from sideways and rotational movement. As you demonstrate its damping capabilities, you are also introducing high stresses in the parts that hold together the two frames, in your case the turntable. Simple mechanics. 3. The only thing that you accomplished with your design now is simply a stiff live axle that moves up and down, any attempt to move it sideways/rotate will only be due to the parts flexibility/slack. Start over. Hope that take this as a constructive critisism from an engineers point of view :)
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External Compressor
MSc Shobaki replied to andrewganschow's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
My best advise is to buy a Dust-Off spray can for offices. It is used to blow away dust from you office desktop and other things. It also comes with a rigid hose, approx 2,5mm outer diameter. At full pressure I think you get 4 bars of pressure. I have a couple of those at my office where I run my LPE V8 ;) good amount of rpms which makes my collegues drop their jaws everytime I run it. One spray can here in Sweden cost roughly 10€ -
Effe's MOC Corner
MSc Shobaki replied to efferman's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
What I meant was if for example the cylinders for the cab tilt have the same mounting points as in the original truck by Lucio. In other words, are all the featured functions in Lucio's truck still intact in your mod? :) I'm asking because I like what you have done so far in your mod -
Effe's MOC Corner
MSc Shobaki replied to efferman's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Michael, is this mod compatible with the rest of Lucio's truck? -
Maybe :)
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But was Dacia Sandero presented in the Innovation at Play-video? I think not. Plus, the name IP Car points to the shortening of the words Innovation at Play. And the only branded car model that appears in the video is in fact the i8
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Even though I follow this thread I might have missed it, but has anyone figured out what IP car stands for? I believe it's the BMW i8 car presented in the Innovation at Play-video. Imagine this, IP Car= Innovation at play Car (BMW i8). I believe that this set will be awesome since the car has white, blue and black elements (panels and liftarms). The BMW i8 is actually a very good car to be replicated in Lego technic since it's hybrid. Here is what I believe the set will feature: 4WD, full suspension on all wheels. Motorized steering (hopefully geared down M-motor, most likely gonna be a servo motor) Three cylinder fake engine block. Motorized drive (L-motor) Small gearbox (not a transmission but a gearbox to choose between sports mode (fake engine) and electric (PF) Remote controled PF (hopefully new RC controller compatible with existing PF, most likely gonna be the same as today) Openable doors and trunk What do you guys think?
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Roughly between 170-220 rpm unmodded. 250-280 lubricated with silicon spray
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The only way I see it with the new v2 cylinders is that they are too long to be of use in an LPE. 11 studs retracted, some 17-18 studs fully extended, that is very long. You could build a 4-cylinder engine if you have four of those 2x11 studs, but I dont think you'd find a use for it in a car. I think that an engine in that scale would be suited for a car in scale 1:5, you won't find proper tires in LEGO for that scale. Unless you buy third party tires. With unmodified parts, you would not be able to get high rpms. The engine would move very slowly and inefficient.
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I could run it easily for 7 minutes in total minimum on one spray can, full throttle. But it gets really cold after 30-45 seconds so you can only run it for a minute before you need to take a break. Hmm one bottle goes for 10€ maybe, at least here in Stockholm. I have actually two inline-3s, one uses the old switches and the other one uses the new ones. All switches and cylinders are modified and re-glued. However, if you need to modify the new ones you need to cut off the round pin connectors and then glue two technic bricks with holes on the sides of the switch :) It works like a charm and the connectors that you cut off can be used like new ones that appears in 42043 for example :)
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Go to your local hardware store and ask for compressed gas can. Its basically hard-pressured air in a spray can with a tube (nozzle). The tube fits tightly inside the lego hose. With the pressure from the can, you'd get 5-6 bars of air pressure resulting in high rpm if you have modified pneumatic parts. My Inline-3 made 1800 rpm on a spray can.
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No probs! Looking forward to see more :)
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Hmm, the only advise I have is to pack in the gears within the cylinder block. Integrate them instead of having them exploited. With this, the gears are restricted from slipping outside the block.
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That's the most efficient way since the balance shaft (center) is better to spin with higher torque rather than speed. Its purpose is to maintain an even distribution of rotation.
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20t double bevel gear on top shaft, 24t gear on center shaft, 20t double bevel gear on bottom shaft will turn out fine :)
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Great work!!! :) looks really good!