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Found 10 results

  1. Hello everyone: I am glad to share this project, the mining excavator, based on Cat 6090. Phisycal Configuration: The Lego Cat6090 is a motorized digger on tracked wheels, 2 XL motors provided enough torque. On the track frame is placed the main structure, and a heavy duty turntable allows good rotations, without fricctions. The turntable is rotated by means of 1 XL motor. The main structure contains: the XL motor for turntable, the air compressor, 4 servos for pneumatic valves and the controller. The design is ultra compact in order to meet the requierement of size/scale. The tracked whell is ultra rigid structure, designed to resist extreme load. The air compressor has 4 XL motor and 2 pneumatic pumps, in order to provide a constant air flow and high pressure, both pumps are de-phased 180° in order to reduce vibrations. 4 PF-servos open/close 2 way air valves, to command all pneumatic actuators. The boom has 2 large pneumatic actuator. Due to heavy height of the boom, 4 spring supply extra force during the elevation. 2 large pneumatics actuators push/pull the arm, those actuators are placed below the arm. 2 large penumatics actuators dedicate to rotate the bucket. 1 medium pneumatic actuator, open/close the bucket. Electrical configuration: Three 18650 batteries provide an average of 11.1 V, the compressor are suplied with 11.1 V, and the servos, lights and turntable motor are suplied with 9V. A BMS (Battery Managment System) manages the charge and the discharge durgin the operation. The tracked frame is steering by the use of 11.1 V, and as well is manage by the use of a BMS. On Board System (OBS): The name given to the controller. There are two systems, one for the main structure, and the secund is used to move the tracked well. The main controller, is a server TCP/IP protocol. The controller has a ESP8266 microcontroller with a TCP/IP stack, this controller is able to be programmed in arduino languaje (also micropython) - Teh ESP8266 is used as a sever, Motor driver: used to control the compressor The 4 PF servos are controlled by means of digital outputs, and the lights. ld293d, this is a H-bridge used to control the turntable motor. The second controller, is a ESP8266 as a client, and controls the speed of the tracks. Also, it has a BMS in order to regulates the charges/discharge of the batteries Accessories: 1) Josyticks: Two joysticks, with 4 dof (degrees of freedom) each of one plus a on/off button, are connected to the server module. 2) App: An application developmented under Android studio is used to visualizate the air pressure and electrical current, this app is WIP (work in progress). Conectivity: The comunication used is socket TCP/IP- Main features: maximun pressure reached: 52 psi (358 Kpa) Voltage bus: 11.1 V Compressor electrical consuption: 23 W Weight: 6 kg Length: 30 cm width: 20 cm height: 30 cm Here some pictures, during the construction and commissioning Note: my apologies for my primitive english
  2. 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.
  3. 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.
  4. I am a fairly new member to the Lego community but have immediately been interested in LPEs. Here is my idea: Has anybody ever built or thought about powering a compressor with the engine itself. So instead of having a compressor powered by a PF motor, connect the crankshaft of the engine to it. This removes the need for the motor entirely. You will obviously need some sort of external pump to get the engine turning over as a start, similar to a starter motor. The other problem I have thought of is that it will create a never ending cycle of the engine going faster and faster and faster, assuming that the compressor can produce more air than the engine needs and vice versa. I currently do not have the resources to test this myself so any feedback would be amazing! Is this a stupid idea? Are there other things I haven't thought of? What are your thoughts on this project? Thanks!
  5. Dear all, For the pneumatic contest, I've built a huge robot called ''Nemesis''(from the ancient greek goddess) and I would like to share it with you. Nemesis has 22 pneumatic functions operated by a double compressor. All pneumatic valves are operated only manually according to the competition. Has a weight of 8kg and consists of 8000 lego technic bricks. Total air cylinders : 26 large 11 mini The compressor uses 2 large pneumatic pumps operated by a PF XL motor. The maximum pressure that can be reached by this pneumatic system is 28 psi with fresh batteries. Due to more than 30 pneumatic ''T-air pieces''pressure cannot reach a higher level because there is a huge drag and the XL motor has no power to rotate more. The length of pneumatic tubes are between 0.5 and 1.5 meters long. Due to the large hoses, large air storage is needed because there is a lot of air loss in the system. The air of the whole system is stored inside 2 lego air tanks (although the system needed far more) : The compressor has an auto-pneumatic switch using a large cylinder, which turns the air engine off when the pressure reaches 24 psi. A manometer is used for showing the air pressure at any time. Functions : Nemesis has 2 arms. The bigger front arm has 15 pneumatic functions and the small back arm has 5 pneumatic functions. The small back arm has the following movements : a) small gripper b) elbow1 c) elbow2 d) shoulder e) shoulder rotation The huge front arm has the following movements : a) large gripper, operating 10 fingers independently having 2 mini cylinders each b) wrist, operating 2 functions (up-down and turning) c) elbow d) shoulder e) shoulder turning Besides, the robot has 2 more pneumatic functions : 1) Face movement 2) A third gripper which is mostly for fun (e.g. for scaring house cats) Here is the video of the project : Thanks for watching Good luck to everyone!
  6. Hello. Last weekend we had our major exhibition at the North of Portugal, PLUG Braga BRInCKa 2016. Me and my wife showed this LEGO aquarium, "As Sereias e a Cidade Perdida" ("The Mermaids and the Lost City"): Water (near 15l) of course, is not LEGO. All other parts are LEGO except some nuts I used: - 2 small M3 nuts inside the shell to force it to go down when air escapes (I'm also not sure if pneumatic tubes are LEGO or not, I got them at bricklink some time ago). Those 2 nuts could probably be replaced with LEGO magnets but I don't care much for purism. - near 140 M5 nuts inside the large green bricks at the bottom to increase weight and prevents all bricks from floating around (could use boat weight bricks, have enough for that but would take lots of space The air compressor is from Sariel - two pumps generate the curtain's bubbles, one pump is for the shell movement and the fourth pump is for the pyramid. There's also a Power Functions Light - one LED inside the pyramid and the other near the shell, behind the dolphin. The idea came after Paredes de Coura Fan Event, in June, where I attended Oton Ribic "Water" presentation. All those blue slopes came from Paredes de Coura and I had to do something with them. For the exhibition I used a few drops of a sodium hypochlorite solution to prevent algae and other micro-organisms to grow. So no real fish could be shown but I used a small Nemo electro-mechanical toy fish that swims a few seconds each time someone knocked the aquarium glass (sorry, forgot to record). A few more photos at flickr
  7. Hello. If I have a Lego compressor and an LPE which are the exact same design, could one of them drive the other one? Is this possible?
  8. Hi everyone, I would like to present you my new creation, the Volvo A25d 4x4 remote controlled. The functions and characteristics are: -4x4 drivetrain powered by one XL motor; -Steering is achieved with a medium motor and one small linear actuator; -Tipper bed controlled by pneumatic and compressor by another medium motor; -Full articullated and big ground clearance. I am very happy with the way I found for the mechanism regarding the tipper bed in which it is only required one motor to operate simultaneously and synchronously the compressor and the pneumatic switch. Since there is a differential between the two, when the motor starts, the power goes to the easier side which is the pneumatic switch. When the switch reaches its end, then the power goes to the compressor. The same is true the other way around. This mechanism is realy helpfull when trying to reach dificult and/or distant places from the battery box because you have the advantage of the lenght of the pneumatic tubes. The link to all the images is here: http://www.brickshel...ry.cgi?f=558887 Meanwhile, I am editing a short video to show you these functions. I hope you like it.
  9. Hi, I'm starting this tread to gather different pressure switch and compressor designs. Please add your designs to the thread, or link to them. I've been tinkering with a pressure switch design for a couple of days (only have time for a few hours a day...) and have come up with a compact functioning design for relatively high pressure applications (will be presented soon). I know there are many other designs out there, and would very much like to see others designs to get ideas to improve my design, or maybe finding a design that is better suited. I also faced some problems with half stud alignment of the old small pumps to make a efficient compressor, so I would very much appreciate if you could show your designs here. I hope this topic can be a resource for the community on pneumatic ideas, especially pressure switches and compressors. -ED-
  10. Here's a creation that satisfies BOTH the fans of Lego Pneumatics AND Power Functions! fr3dpivo posted a of his "Lego Technic 9398 4x4 Crawler mod with height adjustable suspension, stabilizer bar, compressor and modified body. Hope you get ideas for your mod :-). Compressor design by DOTTECHNIC" [second below].