Need help finding a motor plus how to use it

Hey guys, hope your doing well, I hate to inconvenience you but I need your help

I am making a prosthetic leg for school and need an electrical motor for it

The motor must be able to turn the “skeleton” (a small piece of wood) forward and back, additionally it must be able to turn at different velocities (e.g. one speed for walking and one speed for kicking)

Now I’ve used motors before but I don’t know how to make it turn forward and back and additionally at different, not sure if I need to buy a specific one online or if I just need to do something with a normal motor

Once again thanks for your time and your help, I really appreciate it

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  1. 11 months ago
    Anonymous

    Ok you need an inverter and a voltage regulator and a breadboard and then you need some knowledge of electrical engineering. In short, reversing the polarity of the electrical current will in turn reverse the motors drive direction(provided the motor is as bisexual as you) regulating the voltage will allow you to increase or decrease the power to the motor defining it's speed.

  2. 11 months ago
    Anonymous

    You can harvest all this from some shitty rc car. Don't over think it kid.

  3. 11 months ago
    Anonymous

    Find a new project. Not trying to be a dick, but his project is out of your skill set. If you draw out on a piece of paper what you want, I can show you where the major problems will be. But you’d be better off posting your assignment, and getting suggestions that you might be able to accomplish.

  4. 11 months ago
    Anonymous

    The gear reduction and mechanical linkage is being to be the tough part. For a motor, just a stepper motor out of something and drive it with a stepper controller board.

  5. 11 months ago
    Anonymous

    The real problem isn't the motor. The one you posted is cheap. The non-cheap problem is simple. You can't actually do anything with even a small motor like picrel without anything mounted on the axis of rotation.
    I fell for this meme in the early 1990's.
    Only buy motors which have a useful tool attached to the axis of rotation, like picrel.

    • 11 months ago
      Anonymous

      i would suggest sourcing rc car parts: servomotor, esc, lipo battery and transmitter. Simple brushed motor is too twitchy to control him without any kind of gear reduction. Servomotor is like small electric motor with gears changing all the rpms for torque, all in one small package

      • 11 months ago
        Anonymous

        Will do, asap.
        All 3 of my 3d printers are down. All I can do is code, tbh.

        • 11 months ago
          Anonymous

          Post some diagrams. I feel like you haven’t thought this out.

          • 11 months ago
            Anonymous

            I've only been thinking about this since I could code in Atari Basic.
            All I could post would be elemental quadrature Fuchs' methodology equations. Very few anons could make sense of these ideas and almost none of them could prevent the weaponization of them.
            Sorry, anon. Not gonna lie or kill for money. Go talk to /k/ if you want that shit.

            • 11 months ago
              Anonymous

              > Atari Basic
              That’s all we ever needed.
              You could probably put a million complete Atari 800s SoCs on a single epyc die nowadays.

            • 11 months ago
              Anonymous

              Ok moron

    • 11 months ago
      Anonymous

      >Tiny part you literally can get from anywhere in any number and size you want
      Lol
      What he actually needs, is a powerful enough (torque...) motor to actually handle the task (sustain the body), not a ridiculous milk frother shit.
      Like a (appropriately sized) stepper servo motor; 5 sec search:
      https://www.portescap.com/en/industries-supported/medical/motors-for-exoskeleton-applications
      https://www.celeramotion.com/news/articles/5-tips-for-using-servo-drives-in-exoskeleton-robots/
      https://www.instructables.com/Exoskeleton-Arm/

      • 11 months ago
        Anonymous

        >What he actually needs, is a powerful enough (torque...)
        I can already replicate that. I paid good money for the circuit diagrams and mathematics to do it.

        Paul Babwiener got his room clean and his shit wired.
        Those force equations didn't get there without help.
        I will go through your argument as soon as I can. The above link is the premise for my arguments because it is science which is relatively cheap to replicate on standard physics principles.
        I want to prove something valuable to humanity.
        The very difficult part of doing this is not harming humanity in the process.
        Is what I'm suggesting even reasonable to type on a keyboard these days or WHAT?
        I remain only happy to help other humans when it is called for.
        Wut Do?

        • 11 months ago
          Anonymous

          Best luck to you

  6. 11 months ago
    Anonymous

    scavenge a cordless drill, the only part you don't need is some of the plastic housing and maybe the battery if you have a different power source

  7. 11 months ago
    Anonymous

    This is for a stepper motor, but I think you're really overselling your skills when you say you've "used motors before". You can do it with a regular DC motor as well, but you'd need some kind of a feedback system, at least a limit switch or two. And then a microcontroller and a motor driver.
    Tying it to a power drill would be the most ghetto, but simple way of achieving what you want.

  8. 11 months ago
    Anonymous

    Stepper + driver shield: cheap from China but you have to keep track of steps and zero it
    Big metal geared 12v rc servo: very easy to control, may cost you $100 tho and a bit noisy
    Pololu 12V + encoder + motor driver: cheap, most control, but you’d have to write your own position/velocity feedback

    I’d go for the stepper or servo really, many easy tutorials for cheap controllers too

  9. 11 months ago
    Anonymous

    Do you guys realize he is just attaching a small wooden leg to a motor, so it spins?

    • 11 months ago
      Anonymous

      >small wooden leg to a motor, so it spins?
      Automated ass-kicking machine?

  10. 11 months ago
    Anonymous

    Can you post a photo of what you are attempting to build instead of a shitty stock photo of a component that probably wont work for what you are making anyways?

  11. 11 months ago
    Anonymous

    I am way out of my field of expertise here but I immediately thought of a window wiper mechanism and controller. I'm a big dummy but I'd start there.

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