A self-moving lever...

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iacob alex
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A self-moving lever...

Post by iacob alex »

...due to gravity,you can see at : www.geocities.com/iacob_alex/Some_Draft ... led016.JPG

This is a particular application (two unequal disks,two pocket money,a.s.o. ...any shapes,you can imagine ),of a general concept at :
www.geocities.com/iacob_alex/Some_Drafts/text028.JPG

All the Bests! / Alex
Simplicity is the first step to knowledge.
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re: A self-moving lever...

Post by iacob alex »

.....in an elementary mechanical expression,but this time,as a kinetic sculpture,at : www.youtube.com/watch?v=ZHh5w8nvD3M

The name: "Breaking Column.mov"

Sometimes,the art is a subtle,ingenious,crafty expression of science...

As a primary "first line on paper",we have a "self"-moving first class lever ,due to an interplay of wind ,gravity and inertia.

If the whole is simpler than the sum of its parts,we have a lever with a single variable arm...

Why not to use this simple idea?...regarding the topic of this forum?

To simplify,the proposal is:a self-rotating lever,due to gravity and inertia.


All the best! / Alex
Simplicity is the first step to knowledge.
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re: A self-moving lever...

Post by iacob alex »

.....or rotating seesaw with a single player (it's nothing more than an elementary variable leverage...) , at :

www.youtube.com/watch?v=mOGOpzGffRo

To simplify (sometimes "less is more"...) , we have :
-support (fulcrum)
-lever/bar
-fixed mass/counterweight
-mobile mass/circus performer

The continuous rotation is due to a ceaseless gravity unbalance , "tumbling" every half-turn , on the same side of the fulcrum.

If we can replace the performer's motion , with an "equivalent" unbalanced "contrivance"/mechanical..?.. , we can hope for a continuous rotation , due to gravity fall/unbalance and inertia , only!

Al_ex
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Post by AB Hammer »

Al_ex

You are obviously sold on wheel of death approach but in truth it all falls in the same problem to solve as most other designs.

PS I like the wheel of death as well but the answer for it and other will be similar if not the same.

Alan
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re: A self-moving lever...

Post by iacob alex »

.....animation , as a " continuous counterweight rotation" at :
https://youtu.be/3o6v9gwTb7s
...if we upset,roll upward the torque difference on the same side of the fulcrum , as a "self" motion...
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re: A self-moving lever...

Post by Fletcher »

This is a geared parallelogram proposition in effect. The two end cams have the same gearing from a central stator.

The important thing to learn from these is that it is balanced in any position i.e. there is no torque advantage in either direction.

The reason is to do with the GPE gained and lost on both sides of the rotor. They are the same magnitude - they are equal.

If the gearing to one cam is slightly altered then they will not have equal height loss and gain, and there will be torque produced and it will turn.

However the system will now lower its CoM which won't be recovered without energy input. The GPE lost by the lowered CoM is equal to the temporary KE gain of rotation.
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