> On Jul 17, 2025, at 10:35 AM, gene heskett wrote:
>>
> I hope I live to see it do that Chris. There appears to be 2 problems, the
> first being how to spec the targets with sufficient accuracy which it didn't
> do in that demo and how to do that on a step and repeat basis.
>> _
Clasic CNCi
On 7/17/25 13:04, Chris Albertson wrote:
Yes. And now with the BLDC servo motors, they run a relatively low gear ratio
of maybe about 8:1, so that when Electric-Atlas lands the motors are back
driven and create back EMF.Kind of the same thing. It’s intentional, it
makes the joints compli
Yes. And now with the BLDC servo motors, they run a relatively low gear ratio
of maybe about 8:1, so that when Electric-Atlas lands the motors are back
driven and create back EMF.Kind of the same thing. It’s intentional, it
makes the joints compliant.
Back to machine tools…. How long wil
The new Atlas robots are all electric VS the old series that were
electro-hydraulic. As a "retirement" thing, Boston Dynamics released a video
compilation of Atlas' robots worst fails, including many burst hydraulic hoses
that they'd never shown before. Apparently a large part of designing all t
On 7/16/25 12:23, Chris Albertson wrote:
In the old days there were huge differences in how they were controlled. But
today we use microcontrollers for everything.SO there is some convergence
but still I think we can see differences in the physical motors
1) Stepper is just a BLDC motor
Actualy for this they use motion capture from a human dancer to collect “target
points.” The points are (x,y,z, time). Then, of course, the robot does not have
the same mass distribution as a human and would fall down if it exactly copied
the human’s moves.
So they use an “MPC” controller.
> ...
> How would you like to write the “g-code” for this machine (28 axes).
> https://youtu.be/I44_zbEwz_w
If you do the kinematics and inverser kinetamtics I would prefer the usual
g-code with six degree of freedom. Compared
to ordinary industrial robot bolted in floor it would have have an ad
We had to sign DOD forms to allow a 15MB control in the shop. Something
about a control for nuclear subs. It is a '28' axis control.
I could see using the center of gravity with an orthogonal cartesian
coordinate system. Then calculating the limb positions for each pose.
Gcode - nah
On Wed,
In the old days there were huge differences in how they were controlled. But
today we use microcontrollers for everything.SO there is some convergence
but still I think we can see differences in the physical motors
1) Stepper is just a BLDC motor is “dozens” of poles and perhaps two or thre
