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Thread: Is it easy to use MX-64/MX-28/AX-12A all together?

  1. Is it easy to use MX-64/MX-28/AX-12A all together?

    Building an arm using all three of these motors, is the integration/programming going to be a challenge using a servo not in the MX series>

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    Re: Is it easy to use MX-64/MX-28/AX-12A all together?

    As long as you are using MX-28T and MX-64T at a baudrate of no more than 1Mbps, then you should have almost no problems with all of the servos chained together on a single dynamixel buss. Polling servo positions might give you a bit of trouble as the MX servos support sync_read and bulk_read functions that the AX servos do not, so just stick with individual read packets to get present position feedback from the servos and sync_write to send new goal positions to all servos at once. The AX servos and MX servos use different position ranges and resolutions (AX is 1024 ticks from ~30 to ~330 degrees with 180 located at top dead center; MX is 4096 ticks from 0 to 360 degrees with 180 located at top dead center), so any software should use degrees or radians in calculations/poses then convert each angle value to the proper goal position value for the given servo when building the sync_write packet to update the goal positions of all the servos simultaneously.
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  3. Re: Is it easy to use MX-64/MX-28/AX-12A all together?

    Or you could avoid the limitations of using the AX-12 by using the MX-12.

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    Re: Is it easy to use MX-64/MX-28/AX-12A all together?

    Only the MX-12W is commercially available, and it does not have the torque required for most joints. Modifying an MX-12W into an MX-12A by replacing much of the gearset is not something most beginners would be willing to try on their own when they can just buy the cheaper AX-12A that will work immediately.
    Please pardon the pedantry... and the profanity... and the convoluted speech pattern...
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  5. Re: Is it easy to use MX-64/MX-28/AX-12A all together?

    Quote Originally Posted by tician View Post
    Only the MX-12W is commercially available, and it does not have the torque required for most joints. Modifying an MX-12W into an MX-12A by replacing much of the gearset is not something most beginners would be willing to try on their own when they can just buy the cheaper AX-12A that will work immediately.
    Changing gears requires a screwdriver, cleanliness and some dexterity. Anyone working with these servos should know how to repair them.

    Using the MX-12 servo avoids the hardware and software limitations of the AX-12 servo mentioned earlier. Also the MX-12 magnetic position sensor will not wear out unlike that of the AX-12 potentiometer position sensor.

    Ultimately it's a trade space of time, money and skill which only memmerich can to do.

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