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Tractor Talk Discussion Forum

hyd cylinder calculations

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time to quit fa

04-06-2006 19:13:16




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does anyone know how they figure capacity of cylinders as far as lifting or pushing.i would think it would be something to do with pressure bore and leverage. im building a dump trailor to haul wood with a 4x4 combine back axle for flotation and have several cylinders laying around to choose from,mostly from tractor loaders.but i need to know if 2 two inch cylinders would lift 4 tons with out having to cut them off and put in bigger ones later. i see these log spliters advertised as 44 ton of force but i have a hard time believing they can lift a 44 ton load with a 10 hp engine and 4 in cylinder?

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Midwest redneck

04-07-2006 09:38:02




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 Re: hyd cylinder calculations in reply to time to quit farm, 04-06-2006 19:13:16  
Pressure X area of piston bore = force. IE. 1500 psi X 2 bore cylinder = 4600 lbs. area of piston bore is D2 X .7854....2" bore cylinder is 3.1412 sq. inches.



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time to quit farm.

04-07-2006 16:38:05




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 Re: hyd cylinder calculations in reply to Midwest redneck, 04-07-2006 09:38:02  
thanks guy's for all the info. as i am only 30 i have alot to learn about this stuff. usually it is trial and error. i had been relying on my naibor for the thinking part while i do the building on both our projects but he passed away last week so i am a bit in the dark.. thanks again



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time to quit farm

04-07-2006 03:10:56




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 Re: hyd cylinder calculations in reply to time to quit farm, 04-06-2006 19:13:16  
i will probably use my 6420 deere or allie d19 they both run just over 2000 . i was planing on putting the cylinders as close to the front as i can as this would equal more lift i know and the ones i want to use have a 50inch travel so it will lift high enough.. thanks for the help guy's.



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jhill

04-06-2006 19:28:18




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 Re: hyd cylinder calculations in reply to time to quit farm, 04-06-2006 19:13:16  
What are you using for a tractor? Your tractor hydraulic pressure output will determine what the cylinders will push.

Force of a cylinder is area of the piston X the hydraulic pressure exerted.

3.14 x radius squared x hydraulic pressure 2200 psi so for a 2 in cylinder.

For example

3.14 x 1 x 1 x 2200 = 6908 lbs of force per cylinder.

The angle of the cylinder will also affect the amount the cylinder will lift. A straight pus is best.

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john bud

04-06-2006 19:21:52




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 Re: hyd cylinder calculations in reply to time to quit farm, 04-06-2006 19:13:16  
There are 2 measurements for cylinders. The diameter of the cylinder (bore) and the diameter of the rod.

The push force is pressure x pi r squared

So, your 2 inch cylinder has an r of 1 inch (half the diameter). I'm going to guess your pressure at 1000 psi (cuz it's easier for me!)

1000 * 3.14159 * 1*1 = 3141.6 pounds of force.

The pull force is the same, but you have to also do it for the rod and subtract that number from the 3141.6. The rod takes up space on the surface that pushes and that's why it is subtracted.

You have to do triangles to determine effective force by calculating the vertical component of the force provided by the cylinder. If you don't know what that means, then draw out a measured picture of the mounted cylinder in the retracted position and the extended position and post that here. The math will get done for you.

jb

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