Eccentric

[webby2]

This is the build I am working on at the moment.
I have taken the name of one of my other devices and changed it,
Simple Circumferential Rotary Entrained Wave Device, SCREWD.

I have been playing with a few AIs to go through this setup and the PDF is what Claude.ai wrote up after a short conversation.

The testing, when I get done building, will be a simple test.

I am using 6 little stepper motors as the cross slide assembly and an old DC motor as the generator but instead of an output I will use the motor as a load motor.  I will assume a 30% efficient motor and then simply compare the draw for all 6 steppers with and without a load to the input I place on the load motor.

Feel free to share this

[webby2]

Well I thought that this time Chatgtp was going to not make it past the Law of conservation, but backing into the system purely from a Newtonian perspective without energy considerations got the force and distances and all the motions and interactions make sense to Chat.

The kinematics are there, this means that the geometry passes the math test, the forces are there because they are required,, it is a loop.

This file is one of the "presentation" files Chat has prepared for me but I ran out of higher level calculation time so what is promised tomorrow is a polished file that I can share with all the stuff explained.

[webby2]

This is Claude.ai walk through of the setup before invoking the Law of Conservation.

This is just the geometry and kinematics view,  it is not perfect but does show the math

[webby2]

the build so far

[webby2]

just adding this pic and document.

I had Chatgtp write this up for me after we walked through it all yet again.

[webby2]

the steppers I chose were a very bad move, they show the same current whether they are loaded or not, so I ordered some little brushed motors and will need to redo the whole shebang.

[webby2]

I was getting the steppers to work nicely when I realized that the draw from the steppers was not changing and that they were going to use all they can all the time.
I did take a moment to see how much those 6 steppers could lift, so I turned the test bed so the sun gear was vertical, clamped it into my vice and hung a string from the top with a weight on it, it could lift about 4000g and another about 50g took them into a stall.  All of that was close to the spec sheet for these motors which means the system was doing its job of combining all of those motors into 1 uniform distribution fairly efficiently, and the frame and stuff held up to the load.

I had to increase my arm length a little bit to get the sun and ring to lock together, slop and printer error adds up so I compensated by increasing the arm length.  When I ran it the sun orbited and the ring followed and rotated its 60 degrees per cycle while the "pin" rotated 360 degrees leaving a 300 degree slip between the ring gear and the pin.

Steppers 28byj-48
board uln2003
atmega mini clone controller

5V @ 1.41A draw

Now I am redesigning the whole test bed so I can use a brushed motor instead