RE: Description of the Device

fyaocn — Mon, 18 Apr 2016 01:36:03 GMT

Great advice on this design. Just like your keenly observation, in fact, there are two rotary axis for form arm movement. Two motors is needed if control both.

As far as I know from preliminary research, this design is the first attempt on movement assistance for elbow or joints. And now I know why, the principle and control logic is very complex, just to fulfill this simple idea. Therefore, I would like to achieve final goal step by step. This design is the second version. My first design has been chosen for final review of a Hardware Design Contest.

I am trying to improve the design gradually. And I will try to explain that how to alleviate this twist and other possible problem during the process.

The only problem is that I have not received the Design Pack, due to Oversea Delivery, I guess so.

Thanks a lot and I will keep pushing my design even after this challenge.

RE: Description of the Device

DAB — Fri, 15 Apr 2016 19:40:45 GMT

You might want to consider using a motor on each side.

Your current design might cause the elbow joint to twist.

You could also probably use velco straps to attach the device to the arm, though using a couple of solid bands for better strength distribution.

DAB