CG Showcase of Overbalanced Wheel

[norman6538]

While I admire animations I do not trust them because they can do thing that are not real. With that I'll summarize where I am after many great idea failures of my own. When I see great movements in drawings and animations its not about movements but center of gravity.

So lets get to the basics
to make a balanced wheel rotate you have to shift the CG  by lifting
a weight up and that takes work - ie moving something down takes no
work and moving something horizontal takes little work..
I have such a mechanism based on the garage door we all know but then comes
the problem and that is the reset so we can repeat the process. Attracting magnets have the same problem. 

So when I look at a movement I look to see where the CG is and frequently the movement ends up making the wheel bottom heavy and that will make it stop.
For example suppose we have weights on a balanced wheel and we move the one at the top up such that the CG is higher and the wheel rotates from that weight rotating and falling to the bottom of the wheel. We used work to move it up and get rotation and we have to use more work to move it back to a balanced position.

So I simply say look at the CG to see if it will work.

Norman

[johnny874]

  helloha,
This is an idea I've discussed with someone. they tried building it but with how many scissors/levers
it takes, I could understand why they were cool to the idea.
It's based on Bessler's Mt's 25, 26 and 138. When the lever rotates 90 degrees, it would cause the scissors
to fully extend. And when the lever passes bottom center, it would slowly start retracting the scissors.
In the drawing, the scissors have a total of 20  -  2 inch links. And when the lever rotates extending them,
the red line is a link or could be a tether to the top of the scissors. With it being a tether, there would be a
pulley above the scissor and on the bottom of the lever so a line could be looped kind of like a fan belt on a car.
I know it'd be a lot of work but thought I'd mention it. I'm going to take a break from this, it's a lot of
math and that gets old after a while.
With something like this, just one set would show if something like this might be possible and if Bessler
might have done something like this.

                                                                                                       Jim
     

[johnny874]

With something like this, just one set would show if something like this might be possible and if Bessler
might have done something like this.

                                                                                                       Jim
   

  @All,
the trick with something like this is the weight on the scissors would weigh about 10 times as much as the weight on the lever.
With such a ratio, if the scissors open from 28 to 32 inches, the weight on the lever is accounted for and any extra extension would be over balance. Using a distance of 2 inches from center of pivot to center of pivot on the links, a link being pulled down 1.4 inches could open
the scissors as much as 12 inches. In reality, it might only be 10 inches. This would have the equivalent of a 1 1/4 lb. weight being added
to the outside of the wheel.
If pulles were used, they'd be attached to the frame of the wheel and loop like in the drawing. This would mean that as the lever rotated 90 degrees
ahead or 90 degrees back, the scissors would open or close accordingly.
Only reason I mention pulley's is that Bessler said he used them as well as scissors. This si one way the could work together with a lever.

                                                                                                                                                             Jim

edited to add; thought I'd mention that with something like this, if the scissors are retracted close to bottom center, then 2 scissors might be extended on the over balance side at the same time. Kind of wish Anthiny Burr were here. He did some really good work with scissors, his shot out like a rocket.

http://www.youtube.com/watch?v=OlLre-lEgqE&feature=autoplay&list=UUoikS5b8Ybmou9b6KfQl_uw&playnext=1

[helloha]

So when I look at a movement I look to see where the CG is and frequently the movement ends up making the wheel bottom heavy and that will make it stop.
For example suppose we have weights on a balanced wheel and we move the one at the top up such that the CG is higher and the wheel rotates from that weight rotating and falling to the bottom of the wheel. We used work to move it up and get rotation and we have to use more work to move it back to a balanced position.

So I simply say look at the CG to see if it will work.

Norman

norman, a wise man with a wise word.
unfortunately, i wasnt knowledgeable to determine roughly where center of gravity is. 

[helloha]

the bessler wheel is way to advance for normal brain like me to understand