How strong are the dynamixels ax-12+ ?
How strong are the dynamixels ax-12+ ?
by JavaRN
Sun Mar 30, 2008 9:30 pm
Right now I am building a new robot using the bioloid kit. I read somewhere in this forum that the dynamixels ax-12 are quite strong and durable. What I would like to ask is what is the maximum weight one dynamixel can bare, because in the robot I am building right now, the whole thing (including the standard 9.6v batteries that come with the pack) will be all on one pan/tilt system.
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by tom_chang79
Tue Apr 01, 2008 2:47 am
Well, the stall torque is rated at 16.5 kg/cm (roughly 229 oz/in). So the weight would really depend on the length of the lifted object from the servo horn. The stall torques are usually rated with a weight attached to a small servo horn (possibly the one that's on the servo), so the radius at the rating would be the shortest length possible.
The force that the servo can exert is inversely proportional to the length of the radii.
Of course, this is stall torque, you don't really want to operate anywhere near there for any length of time...
The force that the servo can exert is inversely proportional to the length of the radii.
Of course, this is stall torque, you don't really want to operate anywhere near there for any length of time...
by JonHylands
Tue Apr 01, 2008 3:14 pm
Are you talking about putting a humanoid chest/arms/head all on one AX-12?
I've done that with BrainBot, and what we found was we needed to add springs to "help" the tilt servo recenter...
Watch the video on this page:
http://www.huv.com/blog/2007/12/brainbo ... ntrol.html
you can see the springs on the front side. Keep in mind that BrainBot is somewhat heavier than a stock Bioloid - two battery packs, heavy cameras, plus half a dozen extra servos for the head and the grippers.
Worst case, you can run two AX-12's in parallel, so they are both supplying torque for the tilt mechanism.
- Jon
I've done that with BrainBot, and what we found was we needed to add springs to "help" the tilt servo recenter...
Watch the video on this page:
http://www.huv.com/blog/2007/12/brainbo ... ntrol.html
you can see the springs on the front side. Keep in mind that BrainBot is somewhat heavier than a stock Bioloid - two battery packs, heavy cameras, plus half a dozen extra servos for the head and the grippers.
Worst case, you can run two AX-12's in parallel, so they are both supplying torque for the tilt mechanism.
- Jon
by JavaRN
Tue Apr 01, 2008 8:17 pm
Are you talking about putting a humanoid chest/arms/head all on one AX-12?
How do you know?!?!
Thanks both you were very helpful. I tried it (with just the pan and tilt) and it seems to have worked - I still have to test it extensively during this week.
Thanks again.
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