Mr Jos

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    Technic MOC
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    EV3 Education

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    Mindstorms EV3 fully functioning production factory machines.


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  1. You will need to start with a robot design first. 2motors for tank steering/driving, 1motor for unloading. An ultrasonic sensor to measure distance to the wall (preferred to have 2 of them, 1 on the right side, 1 on the left). And if possible a sensor at the front to detect the wall when crossing. You will need to make a flow chart, with all needed tasks to be done by the robot, like this; At the start you don't know the direction the robot is at so; Part 1: Finding where you're at: Tank steer around untill you have visibility <50cm on the right side sensor (it should have started within 30cm of a wall, so you will be able to find it, and you'll know it's now on your right side. Part 2: Start driving to position 1: Now start driving for 2 meters straight on, but have a little correction depending on the right side distance sensor. if distance >30cm steer little right, if <10 steer little left. This should keep it alongside the wall. When finished the 2meter, tank steer 180° and drop off the package. Now use the left side sensor to drive back 2m and have a new book loaded. Part 3: Drive to pos2: Now keep using the left side sensor to stay within 30cm, and drive for 2m more, turn 180° and dropoff package 2. Return 2m and pickup load 3. Part 4: Drive to pos3: Tank steer 90° at the start location, and back up into the wall (need a flat rearend for this), this should straigthen out the robot. Drive in a straight line without compensation to cross the potentially large distance. When the wall is found at the other side, rotate 90° and go to the dropoff loc. Part 5: etcetc. Start with the robot making, and test each 'part' of the flowchart one by one. Find out howlong you need to drive for 1 meter. Find out how much you need to tanksteer for 90° etc.
  2. As it starts fast, then slows down, it seems like a pressure issue? What compressor are you using? At how many bar? And can you confirm the pressure remains at this pressure during running? Maybe make a video or something so we can see what happens.
  3. One servo motor will indeed not have enough power to rotate 4wheels of a heavy machine. If speed is no issue, use a normal motor and gear it down before sending the movement in 4 directions. Is it some sort of portal bridge or something? And about files being to big, don't try to upload them directly here. First upload on a site like your photos, then share the link here and it will show what you're trying to make if you use the correct link, give it a try.
  4. Just ordered 100 Quercetti's. Should be here within 2days, first time I'm going to make a GBC. If it doesn't work out, I'll just program my giant robot arm to pick up the inbox and throw it out a window Later I can always try to add it to my logistics center. Sorting the balls by color, loading them on pallets and store them in the high bay warehouse. Will need to see if they can handle 30balls per pallet. Edit: Balls received 36hours after order, here we go designing my first GBC!
  5. By using axles and gears you can link the servo motor to all 4 wheel hubs to steer them 90° at the same time.
  6. I said it indeed, as it's a new part ID, and the photo shown was indeed a straight gear 60T turntable. I just wonder why, maybe less friction in some setups? Or anything else better?.. If so I might need to buy 7 of them and change them out in my 6axis-robot, they all use gears as spurs, not bevelled. But I don't have the set, so can't confirm hands-on.
  7. I there anyone who has; 2 of the new 12T not-beveled blue gears Some small chain pieces Any motor to drive 1 of the gears Make a setup with the 2gears, 1driven by the motor, 1 idler make a nice chain around them. 1st test, just let the motor run, does it make clicking noise? (If you want to know what I mean, try a 16T red clutch gear as idler, it makes an awefull noise. Or a 8T gear, it's to small for the chain to bend around) 2nd test, put some resistance on the idler axle with your fingers, more and more to see if the driven gear starts to skip. (The same test with 2x normal 16T gears would either rip the chain open or stall the motor) I'ld like to know if I can use this gear to make conveyor belts, as they can be even more low profile, now the 16T gear is the smallest useable. EDIT: Extra question, does anyone have this 12T spur gear as Stud.Io part? I can't find it yet in the library.
  8. I tried that, the weigth is not enough. But right now, I'm rethinking about an older idea, of adding a rubber band to open the latch. If they would help pull it open.. And then the cylinder pushes it to a closed position again. mhmm worth trying. I already tried many setups, using springs etc, but they have a short range. Only 1 stud for the normal ones, and the large ones 2studs, but they are so big.. The pneumatic cylinder is just 5studs long and has 2studs range, so fits perfectly under a 6stud tile. For another TODO, the operation of multiple valves I already tried adding shocks to the valve to push it back closed, so I just need to push or pull the lever in 1 direction. Problem here; It's huge and 1 hard shock is not enough to move the valve (there is a lot of resistance in these). Conveyor is already finished, and fits under the gantry with the bins on top. Might have to put it a bit more up to fit another belt under it.
  9. Pneumatics are something hard to design in 3D.. It's difficult to know how the air lines will behave. The conveyor underneath needs to be high enough so stuff dropped from one side, does not flow over the wall at the other side. But as can be seen in the next render, the air line connected to the cylinder has to pass this wall. The full open cylinder (left one at front) can be in that position easy. The closed ones as well. But the right front, somewhere in the middle of the movement, will go very close to the wall.
  10. I've been modelling the full size 20 storage spaces in build order steps. I did finally find a way to render faster, but it looks really bad with the shadowing on. Will need to turn that off next time. This is the real basic needed structure to make it strong enough to withstand any forces on it. Now need to find a way to route the 20 pneumatic air lines from the back to the front, and then all 40 to a remote place where all the valves are to be operated. Now need to test and see what walls I want to put on top of this structure.. If anyone got ideas.. don't hold back and let me know. Would like it if it's semi transparant so you can actually see the sorted pins in the storage bins. EDIT: Added a missile wall setup: The height is the same as the original design, around 4,5studs. But the problem is the walls in the middle, they are 6studs wide, so the liftarm setup will not work there. (So nothing in the middle yet) Edit2: Just realised that 3+3 = 6. On to legs and conveyor belt underneath design.
  11. I've been testing some setups, and seems a 6x6 tile is a good storage bin, the gripper hand can fit inside to drop a pin. And each storage place can hold a lot of pins. I tested some real setup to see the forces on the hinges if the pneumatic cylinder is opened/closed many times with 2-3bar. The test was good, but I now need to find a way to make 20+ individual trapdoors that can be opened on request. I tried to find a good and strong design in Studio, but due to the 1stud thickness allround and the middle being shared, it's an odd number of studs. Hard to make a bin with system bricks only, so I used Technic stacked for the 13L. What's your opinion for this system/studless mix, or any idea how to get it better? Later a 3 or 6wide conveyor will run under all these trapdoors to bring the dropped items into a pallet/bag/whatever as they were sorted. Another still to do issue is how to operate 20 pneumatic valves with max 2 motors (or 3 at the limit). The pneumatic pumps will just be run by a power functions motor at constant 12V with an over pressure valve I'll build, so no worries for air pressure. Just how to get a motor to actuate 20 valves. Interval times can be like 20seconds or more.
  12. And the last, free extension 2, the scanning conveyor belt is done. Now my whole current setup can be rebuild from scratch. (Also allows me to break it completely down now, if I'm bored of testing the pneumatic release system to free up an EV3). But I need to have my Logistics center setup ready for the event in 3weeks.
  13. This is beyond awesome!! Will the track be inside? I think with the sun on the black track it will have more problems. And it seems to really dislike that one corner, I wonder what would happen if you let it run in the other direction, as now it goes off at the inside. Anyway, love the doggy!
  14. First free extension for the set is ready, the energy chain that can hold all the cables needed for; Programming / Charging the battery for a whole day running without changing the batteries / Sensor cables for sensors on the baseplate (as in my model). Anyone ever in need for an energy chain, have fun with this design, it's working perfect for me in my warehouse that has been running for 100+hours already. Next upgrade will be a simple feeding conveyor belt.
  15. Your next project looks a lot like the new Technic set with the same name I'll be following to see what you will be able to make, guess you will go bigger size with pneumatic outriggers aswell? Else you can take the new set and raise the whole upper structure 10studs.