On 5/16/24 03:55, Chris Albertson wrote:
Just by chance is anyone here interested in advanced machine control and CNC’d
metal parts?
Here is a real product you can buy today for $16K that defines the above. It is
just like our 3-axis milling machines but 43-axis. It just went on sale. API
is on GitHub.
See video —>
https://www.unitree.com/images/Unitree%20G1%20EN%201080p%20%281%29.mp4
Now that, for $16k, is very impressive. I could buy one, but how long
would it take me to program it to hold my beer and watch this? Writing
gcode for LCNC is more my speed.
No connections to LCNC except to show what a few guys in China are making with
their CNC mills.
Already on another list, people are organizing some sort of group to buy one
for shared access. This is not at all like the Boston Dynamics “Atlas” which
cost millions of dollars and was never intended to be sold. This machine is
currently being mass produced and is for sale today.
For the technically minded. The robot has up to 43 motors, half of which are
in the hands. Each motor accepts commands for position, velocity, and torque
and has two rotary encoders, one on the motor and one on the joint after the
geared reduction drive.
There is a network protocol to send the motor commands. They need to go over
WiFi unless you pay extra for a second computer that fits inside and then
commands can go over Ethernet.
The other control mode works in cartesian coordinates and you can give
high-level commands like “stand and balance” or “walk” or “move hand to X,Y,Z”.
The internal battery claims a 2-hour run time based on some average motion.
Mechanically, it is just some BLDC motors and sun-planet gear reductions of
maybe about 6:1 or 9:1, lower than some might expect. All of the rotation
shafts are hollow to allow cables to be routed through the moving joints. What
is impressive is the machine work. As seen in the video, It is light enough to
be lifted by one of the engineers at Unitree.
No more science fiction or “some day you will be able to buy a robot…”. If
you've got $16K it ships directly from China. The company has a decent
reputation for building good quality hardware.
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Cheers, Gene Heskett, CET.
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