bot hand

[A J]

Some ETH-Zurich researchers are open-sourcing their bot hand class.

I marvel at the complexity of the human hand; it has served us well.

https://rwr.ethz.ch/slides/2025/02_Slides_Design_Fabrication_Focus_Talk.pdf

[Stephen Williams]

That is a great reference.

Helps validate whether all of the options have been considered, for the main mechanics anyway.
This only mentions the sensor side.

My current obsession is thinking about how much of a full working hand I can include in a single 3D FDM print, including a 2 material IDEX print.

Stephen

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[Thomas Messerschmidt]

I personally like the three-finger hand—two fingers and an opposable thumb, with the thumb positioned between the two fingers. That configuration allows gripping almost anything, yet, is only 3/5 as complex. 

Thomas

On Sep 29, 2025, at 11:19 PM, 'Stephen Williams' via HomeBrew Robotics Club <hbrob...@googlegroups.com> wrote:



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[Dave Everett]

On Tue, 30 Sep 2025 at 17:10, Thomas Messerschmidt <thomas...@gmail.com> wrote:

I personally like the three-finger hand—two fingers and an opposable thumb, with the thumb positioned between the two fingers. That configuration allows gripping almost anything,

Except for a drinking straw, sheet of paper, sock, wire, wet noodlle :)

I have struct limits on my parallel gripper.  Drink can, jar, mug, plate, gold nuggets.

Dave

[Stephen Williams]

On 9/30/25 12:24 AM, Dave Everett wrote:

On Tue, 30 Sep 2025 at 17:10, Thomas Messerschmidt <thomas...@gmail.com> wrote:

I personally like the three-finger hand—two fingers and an opposable thumb, with the thumb positioned between the two fingers. That configuration allows gripping almost anything,

Except for a drinking straw, sheet of paper, sock, wire, wet noodlle :)

Good point!

I have struct limits on my parallel gripper.  Drink can, jar, mug, plate, gold nuggets.

If you can do 3 fingers well, 4-5 shouldn't be much harder.  While the uneven geometry of the human hand seems unnecessary, sometimes it comes in handy.  So to speak.  In any case, it is an interesting design & engineering problem.

sdw

Dave