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  1. Replies
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    Re: Project of robotic Arm with dynamixel motors

    Do you mean 'TorqueOff' ?
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    Re: Project of robotic Arm with dynamixel motors

    This is looking pretty good I think.
    I have experienced this sort of jerkiness when trying to get a pair of dynamixes to trace a path.
    The truth is that these are not stepper motors, and can't...
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    Re: Project of robotic Arm with dynamixel motors

    The details of the api may be different depending on what code you are using. I was using the OpemCM code, which starts like:

    Dynamixel Dxl(1 /*DXL_BUS_SERIAL1 = cm094 */);

    I was using a...
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    Re: Project of robotic Arm with dynamixel motors

    You can use
    Dxl.getLoad(inId);
    to get the load. This is the amount of power required to drive the motor to the requested position.
    Detecting a collision using this could be tricky because this...
  5. Re: Self-navigating rover, and how to ruin an AX-12A

    Could it be an angular momentum thing? Does the slipping happen if you spin the wheels in the air with no surface contact?
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    Re: First test of robot arm

    Yeah, the hubs are a bit of a sore point because the exposed soldering on the back, aluminium frame and the Arbotix M serial port did not mix well. I printed backs for them, but too late to save the...
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    Re: First test of robot arm

    Here is a bit more info on the design of the arm.

    https://www.youtube.com/watch?v=xPKi3ssETbM
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    First test of robot arm

    Here is a video of the first attempt to run a sequence on my robot arm.

    https://www.youtube.com/watch?v=B417vTm4DDM

    The arm is still a bit of a work-in-progress, and uses a linear actuator to...
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    Re: Some love for the Money Pit

    I see 4 independent drives could allow you to spin on the spot.
    You could probably gear you ax12s by a factor of almost 2 and still keep your range of movement, say by a timing belt or a simple...
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    Re: Some love for the Money Pit

    Nice project. Have you considered using a micro-linear-actuator for steering? These seem to be a bit more expensive than the ax12, but might handle the load better. If you can rig it to only use 1...
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    Project Re: MX-Phoenix hexapod and some more

    Wow, that is a great video. Creepy, but in a good way.
    Hugh
  12. Re: Ressources for OpenCM-companioncomputer UART communication?

    The OpenCm will "forget" what it was doing if you give it a command and unplug it. ie, the program will restart.
    It depends on what you get your program to do when it starts (the blinking LED was a...
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    Re: Capacitor for MX28?

    I tried the capacitors, no difference.
    I swapped out the power supply for a better one, but only rated 2A, and it works fine. It appears to draw 0.7A while the actuator is running. So I'm thinking...
  14. Re: Ressources for OpenCM-companioncomputer UART communication?

    I think the IDE is a rebranded Arduino IDE which looks like it is Java based.
    You could try the rpi version of Arduino IDE and see if you can select the OpenCM board - might need to copy some...
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    Re: Capacitor for MX28?

    Thanks - I'll give it a go. Sounds like i might need to work out an oscilloscope solution for myself too.
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    Capacitor for MX28?

    Hi
    I'm running a linear actuator and 2 mx28s from the same 12v power supply.
    The supply is rated for 10A, which should be fine I think.
    However, when the linear actuator starts or stops, the mx28s...
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    Re: ArbotiX-M partially dead

    The actuators seem ok. When it happened, I though "you idiot!". But maybe not toooo much damage and a good lesson.
    Mind you, adding a 1c piece of plastic on the back of the connectors would make...
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    ArbotiX-M partially dead

    Hi,
    I think I killed the Dynamixel serial port on my ArbotiX-M when I accidentally shorted the bottom of a connected power-hub.

    The motors seem ok using a different board, and the usb...
  19. Question(s) Re: Assistance in understanding Phoenix Gait routine

    Looks like a beast! Would love to see it moving.
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    Re: An impossible robotic arm?

    Depending on the accuracy you are after, you could use cheap linear actuators to do this. They certainly have the torque - not sure about the millions of times. Here is a example costing only a...
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    Re: Experiment with linear actuators

    Here's a little update to the design using the position feedback to allow control via USB.

    http://youtu.be/QMMlMlj_-NA
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    Re: Experiment with linear actuators

    Good points - the laws of robotics suggests that I should not try to harm anyone. I saw somewhere that someone had added a stiff spring with displacement measurement to a linear actuator to create...
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    Experiment with linear actuators

    I was looking to build a robot arm with a reasonable lifting capacity (couple of kilos), and had difficulty finding something stronger than robot servos but cheaper than a full-spec industrial arm. ...
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    Re: CM-530 controller issue

    I managed to reset the page offsets from the offsets menu. They all appeared "0", but the program did not send the values to the robot until either I wiggled the values or hit the initialize button...
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    Re: CM-530 controller issue

    Yes, setting the position via RoboPlus Manager works, and also the initial position works. Now I am suspecting a funky motion offset because when I move motor 0 to a bigger position, the value...
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    CM-530 controller issue

    Hi,
    I am running a bioloid premium robot. It was working fine, but now things have gone very odd. When I use RoboPlus Motion to view the "Pose of Robot" (after enabling the torque) many of the...
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