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  1. Kaero

    James Watt's Steam Engine

    I have made the back side of cylinder is transparent so you can watch movement of piston and sliding valve. See following video and some pictures: https://www.youtube.com/watch?v=n8Iy_3mY1kg
  2. Kaero

    James Watt's Steam Engine

    No lubrication is needed. Mr Kleinstein did a good job, the only thing you have to do is to make some free play on the axes. The good insulation is not needed. The cylinder is of course leaking air, still average vacuum cleaner makes sufficient air flow to run the engine. No special precaution during building is required.
  3. Mr. Kleinstein posted very nice James Watt's steam engine to lego Ideas. And he shared the digital file, so I have slightly modified it and made instructions. This is a working model of James Watt's steam engine. The model represents a beam engine, with an upright cylinder and a large flywheel. The to-and-fro motion of the piston inside the cylinder is taken up by the large beam, and then converted to a rotary motion by planetary motion gears. To make the piston rod on the end of the rotating beam travel in a completely straight path, a system of levers called Watt's parallelogram is employed. A sliding valve driven from the main crankshaft steers the intake and outlet of steam. The machine also includes a speed governor, an air pump for the steam condenser, and a feed water pump. The model actually runs on a gentle vacuum, as provided by carefully approaching the steam outlet with the hose of a vacuum cleaner. There are 1152 bricks in this model. The build is quite challenging; the hardest part is adjusting all the parts to move really freely, and then centering the motion of the slide valve. When finished, the rigid frame stabilizes the engine so it can easily be picked up and handled without coming out of adjustment. The model contains also a fireplace, boiler and a heap of coal. The modeled steam engine would typically use a Cornwall-type boiler, which would be even longer than the machine (at the same scale). The engine frame would be at floor level. The instructions were generated in Studio, and contains also description of steam engines, Watt's inventions, properties of the model and some pictures of real beam engines. My own photos are quite bad, so you see only render or Mr. Kleinsteins original video. However it is fully working, and my older boy likes to play with the large wheel, he likes to watch sliding valve moving, and placing spiders all around. See Mr. kleinstein's video on flickr: Rebrickable: https://rebrickable.com/mocs/MOC-22090/ All model files (.io, .ldr, .odt, .pdf) can be downloaded here: https://www.dropbox.com/sh/owccc09eev0kxg6/AAA5W0qkzNCR-yM4odlq9Zo2a?dl=0 I was not sure if put it into technic forum or scale modelling, however the funcionality is the main thing so it seems to fit technic forum.
  4. nerdsforprez: You said the batteries would add another 250 kg. The car itself is 1500 kg, so I believe the metal frame could easily take another 250 kg of batteries. This is not a problem. The main issue is replacing the batteries. Try to imagine it. Try to replace 6000 AA batteries. Not only this would be extremely time consuming but I would fear about the incredible and unnecessary waste.
  5. I would like to show you a wonderful project for students. The Kibble balance (in history called Watt balance) is used in metrological institutes to determine relation between Planck constant and macroscopic mass at level of kilogram. Such a device is very complicated and extremely expensive. However a new SI system is being based also on results of these devices. To show students principles of Kibble balance, a Lego Kibble balance was developed by NIST (metrological institute of USA). One need lego pieces, but also some laser pointers, magnets, wires and digitizers with computers to build it. The lego Kibble balance has precision to 1 % (real Kibble balance has precision about 0.000 000 01 %). NIST released paper with description, video, cad file, software, and instructions for additional electronics. Links to these are lower. Recently I have visited RISE, swedish metrological institute. They have also built the Lego Kibble balance recently. Pictures are shown lower. There is more system Lego bricks than technic, and a lot of non-Lego stuff, however I had no idea which forum is better for this topic, and it seems to me that the nature of the project is purely "technical". I tried to find out if someone already posted this on Bricklink, but no success. So if administrators think this should go into another forum or was already posted in history, topic can be (re)moved. So enjoy top quality scientific Lego measurement device that is pushing frontiers towards brighter future! My pictures of RISE Kibble balance: NIST video about Kibble balance: Link to paper with additional sources: https://aapt.scitation.org/doi/full/10.1119/1.4929898
  6. A friend was thinking what can be price of such full size lego bugatti. So I tried to estimate it: According released materials, they spent 13438 manhours. Lets say the employer in Czech republic pays about ~1000 Kc/manhour, it is ~40 euro/hour (the average salary of the workers will be probably much less, but the company has to pay insurance to government). So salaries takes about 537520 euro. Bricks: ebay sells kilogram of unsorted bricks for ~16 euro, the weight of the car is according released materials 1500 kg, so about 24000 euro (part of car is steel, however it is only estimate, price of bricks in factory will be much smaller, and anyway it seems the price for bricks is negligible compared to salaries). Motors: 2700 PF medium motors is about 54600 euro for market prices, the factory price is smaller, however still much less than salaries. There are steel parts, in my opinion quite negligible. Real new bugatti chiron tires costs 24000 euro, however I do not believe they used the real racing quality tires and wheels for the lego car that goes maximally about 30 km/h. So in total the estimate can about 640 000 euro, mostly made by salary of employees. Real chiron car costs about 2 500 000 euro, so the lego car is approximately 4-5 times cheaper. But! There was produced about 500 real chirons till now, but there is only one unique lego chiron, so in my opinion an auction price of lego chiron is totally incomparable to real chiron :) Last thought: according video, at least half of the man hours was spent on development. Lets say such lego chiron would be produced in factory, I believe one can decrease man hours up to 1/4, and the development costs are divided between many cars, it means the price of factory produced lego chiron car could go down hopefully to 200 000 euro! Who would buy it? Maybe there is a potential for a big business! :)
  7. It looks really fast. I really have to buy RC motors... Or at least one and make subtractor.
  8. So I did some modifications of B model. It has tipping body operated by L motor, plough raised by M motor. On the tipping body are super awesome bush and tree cutters installed by my 5 year old boy. Cutters can be manually folded back. See dropbox folder for more photos. https://www.dropbox.com/sh/l9ut686kpby4c6w/AABXN2l_KEAJxuvGoGA3vnwKa?dl=0
  9. I have built the tracked car and it is wonderful. However I have some problem - the resistance when riding on the floor is quite high. Usually kids can push and steer some car by one hand using HOG wheel. But not with this design. I myself have to push this tracked car with one hand and with the other steer using HOG. Please can someone confirm this is normal behaviour? I have built it using pieces from other lego sets, and the tracks were heavily used in older builds. Could be this the cause of the problem? I have already built many technic designs and I am quite sure I left enough space for rotating parts, no bushes pushed tightly, I have always checked axis were rotating freely before putting pieces together etc.
  10. I was also surprised there is not many modifications of the B-model. In my opinion it was build to be modified. The flat bed after the cabin claims for modifications. I did some improvements for kids. It has front plough that can be lowered by small motor and a tipping body behind cabin operated by another motor. I have to make some pictures and post them.
  11. Your model looks very interresting. Am I right the control and mechanics of rotors is very similar to the real helicopter? Would it be a good educative build to explain how helicopter works for my kids?
  12. I will be very glad if you will test the instructions. I am not sure I understand your question. The axis of the Earth is simulated properly - i.e. you can show seasons on this model. The axis aims all the time to one 'distant star', like real Earth axis aims all the time to Polaris (North Star). However small effects (almost not observable by human eye in real world) like precession and nutation are not simulated. Take a look at the video of Ryu Wakimoto, it could help. https://rebrickable.com/mocs/MOC-9044/sidebook/planet-orrery/#bi
  13. Because Earth holds on the axis only by one 2x2 rounded plate with axis hole. This could be improved if someone would have some free time to completely rebuild design of the Earth.
  14. Kaero

    Ursus 912 Tractor

    This is not Ursus. This is Zetor! And the proper colour is red or blue! Wonderfull model. I have seen these tractors like everywhere when I was a kid. When someone say tractor, such one appears in my mind. (for people not from CZ or PL: Zetor is a czech tractor company, Ursus 912 was builded in Poland as licensed copy of Zetor 8011)
  15. Ryu Wakimoto made wonderfull Orrery with Earth tilt, see: https://rebrickable.com/mocs/MOC-9044/sidebook/planet-orrery/#bi I have modified it slightly: removed cover of the stand to show internal gears, added shining Sun and other small changes. And I have made instructions with some details about function and real motion of planet and moon. Orrery was already tested in astronomical learning group for kids at observatory in my city. Kids enjoyed it a lot. A shining Sun is a huge source of learning and fun. Maybe a lot of you have seen orrery by JKBrickworks. This one has a huge improvement: Earth rotation axis is tilted. Therefore following features can be shown using this orrery: Orrery simulates: 1, Sun rotation, 2, Earth orbit, 3, Earth rotation, 4, tilt of Earth axis 5, Moon orbit, 6, Moon rotation. A rotating Sun can be used to show rotation of Sun. A shining Sun can be used to show phases of moon, illumination of Earth during seasons, polar day/night, lunar or solar eclipse. Either motor or hand can be used to rotate orrery. Model deficiencies: Moon eclipse comes every single orbit of moon due to limited size of the model. New moon always cause solar eclipse due to limited size of the model. Sun rotation is independent on latitude. All source files (even for instructions) are at: https://www.dropbox.com/sh/jsgn7lhblmgi4ja/AADIiNpdXUFmLksekZUZMmIPa?dl=0 You can take a look at this lousy video: Instructions should be mostly OK, but I would be happy if someone other will build it and tell me about problems or caveeats. Also on rebrickable: https://rebrickable.com/mocs/MOC-11790