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Force multiplier

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electrodacus:

--- Quote from: IanB on February 11, 2023, 11:24:11 pm ---Yes, I am saying we can construct a mechanism so that when the human pulls on the rope, the gearbox mechanism moves towards the wall.


You are the smart one here, you figure it out.

I am pretty sure everyone else reading this thread can make a post that says, "I can see how to construct such a mechanism."

Let's see how many do.

--- End quote ---


I think I know what you have in mind so keep in mind that the input and output string can not be offset. It should be as in the diagram.
Offset equal and opposite forces will create a torque (rotational force) and that is not what we are discussing here as the is no offset in diagram (a)

electrodacus:

--- Quote from: PlainName on February 12, 2023, 12:00:39 am ---I can easily see how to construct such a mechanism.

--- End quote ---

See replay I made to IanB.  Offset is not allowed.

IanB:

--- Quote from: electrodacus on February 12, 2023, 12:01:56 am ---I think I know what you have in mind so keep in mind that the input and output string can not be offset. It should be as in the diagram.
Offset equal and opposite forces will create a torque (rotational force) and that is not what we are discussing here as the is no offset in diagram (a)

--- End quote ---

If there is any offset between the two strings then the rotational torque created will cause them to line up in a straight line. If the two strings are normal flexible cords, there is no way for them not to be in a straight line when pulled taut as shown.

PlainName:

--- Quote from: electrodacus on February 12, 2023, 12:02:37 am ---
--- Quote from: PlainName on February 12, 2023, 12:00:39 am ---I can easily see how to construct such a mechanism.

--- End quote ---

See replay I made to IanB.  Offset is not allowed.

--- End quote ---

Who needs offset? Just you, I think.

I get the impression that you'll start disallowing this and that until we're eventually left with a single piece of string and no mechanism. Whether it is offset or not is irrelevant - as you note, that would cause some torque until it naturally aligned anyway.

electrodacus:

--- Quote from: IanB on February 12, 2023, 12:08:02 am ---If there is any offset between the two strings then the rotational torque created will cause them to line up in a straight line. If the two strings are normal flexible cords, there is no way for them not to be in a straight line when pulled taut as shown.

--- End quote ---

Not quite sure you understand what I mean by offset.
I'm referring to a spool with two diameters with the string connected to wall on one diameter spool and the one connected to human on the other diameter.
In that case there will always be a an offset and they will not be on the same line as the spool is constantly falling over.
As soon as the two equal and opposite forces are offset you get a rotational force. It is like in case (a) I will apply the force F1 to other part of the wheel other than the bottom directly in line with the F2.
So the two separate strings should look as in the diagram as if it was a single string.
So say you have a cube box and two holes in the middle of opposite faces just as large to have the string pass trough. Then inside you can have whatever you want (of course not a battery and motor :)).
 

And why not have the exact mechanism in case (a) ?

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