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About ord

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  1. I admit, there is something nice about having the axes in the same plane. If you were to control it with linear actuators you could do away with the lower turntables and have it mounted on pins, I think, to streamline it a bit. I wonder how luffing is driven in the actual machine...
  2. You could mount the boom axis above the luffing axis (rather than on the same plane)? This looks like how it's done in the Gradall excavator photo you attached. This could also lend itself well to controlling luffing by linear actuators, if you want to go down that path. Great project btw - it has a lot of similarities with an industrial robot arm. Well, I guess it kind of is a robot arm... on tracks
  3. Nice robot arm! I'm working on one myself so will be following this thread. I haven't done it before but was considering using the Robotics toolbox for Matlab to simulate the arm and get joint coordinates to plug into python. Any idea how you might approach it?
  4. ord

    General Part Discussion

    I imagine the notches are there to allow the inner core to slide out during molding.
  5. Here are some pics of the mechanisms. It is really quite simple: blue cams are horizontal segments and red cams are vertical segments. The segments fall back due to gravity The code is the complicated part (screenshot here). Basically: The first loop returns the tilt angle as an integer between -9 and 9 (and its modulus for simpler coding later on) The second loop rotates the motors (in parallel) every time this value changes. Motor positions are determined by... The next four loops. They constantly determine which segments should be on or off, depending on the integer(s) returned in the first loop
  6. Since the release of the Powered Up technic hub, I've wanted to experiment with its internal tilt sensor(s). I planned to create an aircraft simulator that displayed both pitch and roll mechanically, however, due to lack of parts it only shows the pitch (accurate to 10 degrees): It works by having 4 motors each controlling 2 segments of the display (8 moving segments total) via cams. Each motor can be in one of four positions, putting its respective segments to OFF-OFF, ON-OFF, OFF-ON or ON-ON. It's not as responsive as I had hoped but was a fun little build
  7. ord

    [GBC] Let's build ball mechanical flowmeters

    Thanks for the explanation @Thierry-GearsManiac - a truly unique concept P.S. That linear drive by Yoshihito ISOGAWA is great
  8. ord

    [GBC] Let's build ball mechanical flowmeters

    Fascinating. Can you define what the output dial actually reads (in your initial model)? i.e. it is the average flowrate of the balls but across what period? For example, a real life situation might be: 10 balls, 10 no balls, 10 balls, 10 no balls... In this situation will the dial tend towards 100%, 0%, 100%, 0% or hover closer to 50%. Is changing the period simply a matter of adjusting the speed of the cvt?
  9. Thank you very much. Great work
  10. @kbalage I experience that when controlling the motor directly with the slider but with a variable in between, as above, it seems less pronounced and can even stabalise. Still, it is far from usable.
  11. Thank you all for the kind words. It should be noted that the steering requires a ~0.2 second delay to function properly is buggy in this version of the app (3.0.0), making it impractical to operate. Hopefully something that gets fixed in a future update.
  12. Using the controller GUI in the Powered Up app, it is possible to remote control a vehicle with electronic differential. w = wheelbase t = track v = velocity (of virtual motor in centre of vehicle) a = steering angle (+/- 30°) r = turning radius A = steering motor C = left drive motor D = right drive motor The theory: https://www.researchgate.net/publication/224184352_Ackermann_mobile_robot_chassis_with_independent_rear_wheel_drives
  13. ord

    Axle Collection Thread

    Here's an idea I had for a live axle with sprung linkarms, to soften front/rear collisions. Top shaft is steering, bottom shaft is drive