PDA

View Full Version : [Question(s)] Dynamixel



Grand Robot Master
04-24-2009, 10:28 PM
Can dynamixel servos be used on the lynxmotion SES?
do they only respond to the bioloid "brain"?

lnxfergy
04-24-2009, 10:30 PM
The bigger problem is that they have a completely different size and mounting layout, they won't work with SES brackets. They also won't work with SSC-32 because they use a serial bus, not servo-style pulses.

They do however, come with their own bracket set, which is comparable to the SES brackets.

-Fergs

Grand Robot Master
04-24-2009, 10:34 PM
I see.
crap.
now i have to either go buy a bioloid, or get some hitec servos.
Does anyone know where to get servos cheap?

DresnerRobotics
04-24-2009, 10:36 PM
Hobby servos good enough to build a solid robot won't be cheap, and the Bioloid kits tend to hold their value when sold as used rather well. Short answer, not really.

The AX-12s, at about $45 a piece, are very cheap considering.

Adrenalynn
04-25-2009, 12:13 AM
I'll just underscore what Fergs said: The AX-12 servos come with their own brackets.

DC Robotic
04-25-2009, 08:19 AM
I was faced with the same choice a month ago. I went with the Dynamixels, controlled with USB2Dynamixel. A few other differences that mattered to me. The AX-12s have multiple very secure mounting points via retained nuts. They also have a mounting point to provide a rotation point opposite the servo horn which can add a lot of stiffness to joints. These features make fabricating stiff brackets a lot easier. Take the dimensions of the AX-12 and mounting points - Make a CAD drawing - print to scale - stick to aluminum or plastic- cut, drill and fold - and you can easily make custom brackets. Additional pro's: they wire serially with 3 wires; and provide lots of feedback information which servo's do not. This also allows for some protection from overheat and overstress. As you can probably tell, I have been quite pleased with them.

Grand Robot Master
04-25-2009, 03:36 PM
ill probably just get a bioloid.
ive heard many good things about it

Gorbag
04-25-2009, 05:56 PM
A bioloid seems to be worth the money, particularly when you price out the AX-12s separately. You're getting a tremendous value in the comprehensive kit (http://www.trossenrobotics.com/bioloid-comprehensive-robot-kit.aspx); even if you never use the included CM-5 (I bought a gumstix to do my controlling).

siempre.aprendiendo
04-26-2009, 03:43 AM
Can dynamixel servos be used on the lynxmotion SES?
do they only respond to the bioloid "brain"?

This post (http://www.lynxmotion.net/phpbb/viewtopic.php?p=42745#42745)(lynxmotion forums) from Jim Frye (lynxmotion owner I think) announce a new SSC-NG which would support AX-12 servos, but trere are no news about it since last year (http://www.lynxmotion.net/phpbb/viewtopic.php?p=45298#45298)