The LeRobot / SO-ARM101 uses $9 motors [1] has 5 degrees of freedom and is available with all parts for $300 [2] fully assembled. They don't quote a payload, reach, speed or repeatability. Their target market is people who want to play around with things like imitation learning outside of simulation at the lowest possible price, and who don't care about payload, reach, speed or repeatability.
The reBot Arm B601 uses $150 motors [3] has 6 degrees of freedom and a kit with all parts is $1200 [4] not assembled. They claim a 1.5kg payload, 650mm reach, and 0.2mm repeatability - numbers that are good for the price, if true (take that 0.2mm with a pinch of salt). It has no brakes, so don't lift anything you're not willing to drop. Obviously it doesn't compare to a $40,000 industrial arm, but for the price you wouldn't expect it to.
They actually describe it as "6+1 degrees of freedom" [1] with the gripper being the "+1" - so it's got base, shoulder, elbow, wrist1, wrist2, wrist3, and gripper.
This is a conventional way of describing things. Traditionally robot arms come with a "tool flange" where you attach your own "end effector" (which might be a gripper, or a suction cup, or a welding gun, or a paint sprayer, or whatever) and we count the degrees of freedom before the tool flange separately from those after the tool flange.
Occasionally robots come with 7 degrees of freedom [2] which gives you more options for reaching the same tool flange position. This can be useful in certain applications, like working around obstacles in the environment. It's uncommon though.
It should be noted that 6 degrees of freedom is the minimum that enables reaching any point with any orientation of the effector, while 7 degrees of freedom is what a human arm has with the shoulder fixed, which enables reaching some points even around some obstacles that would block a 6 degrees of freedom arm.
Including the movements of the shoulder, a human arm has 9 degrees of freedom, but the additional 2 degrees of freedom do not provide a new capability, they just extend the range of possible motions beyond that limited by the joints of the other degrees of freedom.
An arm with many degrees of freedom, like an octopus arm, could reach some places even when having to avoid many obstacles.
The reBot Arm B601 uses $150 motors [3] has 6 degrees of freedom and a kit with all parts is $1200 [4] not assembled. They claim a 1.5kg payload, 650mm reach, and 0.2mm repeatability - numbers that are good for the price, if true (take that 0.2mm with a pinch of salt). It has no brakes, so don't lift anything you're not willing to drop. Obviously it doesn't compare to a $40,000 industrial arm, but for the price you wouldn't expect it to.
[1] https://www.aliexpress.com/item/1005008284773473.html [2] https://www.seeedstudio.com/SO-ARM-101-Assembled-Kit-Pro-p-6... [3] https://www.aliexpress.com/item/1005008012684745.html [4] https://www.seeedstudio.com/reBot-Arm-B601-DM-Bundle.html
so, six variables that produce a posture. 6DoF.
but explaining this makes me feel like i'm missing some deeper meaning in your comment?
This is a conventional way of describing things. Traditionally robot arms come with a "tool flange" where you attach your own "end effector" (which might be a gripper, or a suction cup, or a welding gun, or a paint sprayer, or whatever) and we count the degrees of freedom before the tool flange separately from those after the tool flange.
Occasionally robots come with 7 degrees of freedom [2] which gives you more options for reaching the same tool flange position. This can be useful in certain applications, like working around obstacles in the environment. It's uncommon though.
[1] https://www.seeedstudio.com/reBot-Arm-B601-DM-Bundle.html [2] https://explicit-robotics.github.io/exp_robot/kuka_LBR_iiwa7...
Including the movements of the shoulder, a human arm has 9 degrees of freedom, but the additional 2 degrees of freedom do not provide a new capability, they just extend the range of possible motions beyond that limited by the joints of the other degrees of freedom.
An arm with many degrees of freedom, like an octopus arm, could reach some places even when having to avoid many obstacles.