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[PierArg]

excuse my ignorance but I can't understand the application:

If the piston pushes to the point I can't understand why the fulcrum (point b) is close to it and not to point c (which would be where the pair is discharged). I would have moved the fulcrum to point c.

 

[PierArg]

excuse my ignorance but I can't understand the application:

If the piston pushes to the point I can't understand why the fulcrum (point b) is close to it and not to point c (which would be where the pair is discharged). I would have moved the fulcrum to point c.

Could someone explain how it works exactly?

Thank you very much

 

[MBT]

excuse my ignorance but I can't understand the application:

If the piston pushes to the point I can't understand why the fulcrum (point b) is close to it and not to point c (which would be where the pair is discharged). I would have moved the fulcrum to point c.

Could someone explain how it works exactly?

Thank you very much

You don't understand. .
What do you get in a 1st-type lever by moving the fulcrum from the mid-range to the periphery?

 

[Fulvio Romano]

Have you ever seen a hydraulic cylinder work as you say? Look at the cranes. the cylinder presses very close to the fulco (ok, it's second type, so instead it's first) because increasing the strength is easy, just increase the section a bit, while increasing the race involves bigger problems

 

[PierArg]

thanks to both for explanations

You don't understand. .
What do you get in a 1st-type lever by moving the fulcrum from the mid-range to the periphery?

you get that the piston stroke must be much higher at the same displacement of the opposite end. However, saving on strength as the power arm increases considerably.

Have you ever seen a hydraulic cylinder work as you say? Look at the cranes. the cylinder presses very close to the fulco (ok, it's second type, so instead it's first) because increasing the strength is easy, just increase the section a bit, while increasing the race involves bigger problems

So in the project of cranes and/or similar systems is the priority to shifts instead of forces at stake?

 

[MBT]

you get that the piston stroke must be much higher at the same displacement of the opposite end. However, saving on strength as the power arm increases considerably.

That's right. :finger:
or vice versa, depending on where you move the fulcrum.

So in the project of cranes and/or similar systems is the priority to shifts instead of forces at stake?

depends.
Sometimes it is easier to manage the strength that the race, in other cases the race is not a problem but becomes the force.
depending on the case, use one or the other lever, or play with lightning.
Look at a crusher or a tweezer for ice.
the force is always that (the hand) but in one case you need a lot of strength (you have to break a shell...) and you get it at the expense of the race
in the other case is the opposite.. .

 

[Fulvio Romano]

So in the project of cranes and/or similar systems is the priority to shifts instead of forces at stake?

Yes, increase the race means having more bulk, more material, more weight, risk of tip load collapses, large working angles of the piston, etc. increase the strength is almost free.

 

[Fulvio Romano]

Okay, I've been too absolute. As mbt says, there are also cases opposite to those I say, but they are quite rare.

 

[MBT]

Okay, I've been too absolute. As mbt says, there are also cases opposite to those I say, but they are quite rare.

in reality they are not so rare.. .
in automation, for example, forces are often a problem
idem if the drive is manual.

Clearly, if you have a hydraulic power plant that pumps at 250 bar.... :tongue:
every problem of force becomes relative. . . .

look, take as an example the car hatch and see how the gas spring is applied... :wink:

 

[Fulvio Romano]

in reality they are not so rare.. .
in automation, for example, forces are often a problem
idem if the drive is manual.

Clearly, if you have a hydraulic power plant that pumps at 250 bar.... :tongue:
every problem of force becomes relative. . . .

look, take as an example the car hatch and see how the gas spring is applied... :wink:

Yes, I was referring exclusively to hydraulic drives. there the possibility of needing to reduce the thrust is quite rare.

 

[MBT]

Yes, I was referring exclusively to hydraulic drives. there the possibility of needing to reduce the thrust is quite rare.

in fact it is practically nothing:
if you need strength increase alesage or pressure
If you have too much, put a pressure reducer or calibrate the allotment.. .

 

[PierArg]

Thank you so much to both!! !

thanks to your answers (even in discussions where I don't take part) I'm learning a lot of practical concepts that I'm treasured with.


Thanks again