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Old Hydraulic Cylinder

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Skinner

12-26-2000 03:29:57




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I'm building a hyd. post driver and what I need is the most important part, a hydraulic cylinder.
I'm looking for a used cylinder that has about a 5 to 6 foot stroke. (10-12 feet extended). I could more than likely use one off a small forklift. It's going to lift a 450# weight straight up then drop it. A 2" cylinder would be perfect.




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Question?????

12-27-2000 04:22:34




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 Re: Old Hydraulic Cylinder in reply to Skinner, 12-26-2000 03:29:57  
I wonder if I'm right...how do you find out how much force you're getting out of a cylinder...find the surface area of the piston, in sq. in. and then multiply by the system pressure????



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Earl Borchardt

12-31-2000 21:11:19




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 Re: Re: Old Hydraulic Cylinder in reply to Question?????, 12-27-2000 04:22:34  
Question????,
Your exactly right! A very basic hydraulic formula is F equals PxA. "F" being force,"P" system pressure, and "A" Area of the piston.



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ralph

12-26-2000 16:50:38




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 Re: Old Hydraulic Cylinder in reply to Skinner, 12-26-2000 03:29:57  
Skinner, Don't know just what you have in mind but if you are building one simular to ours, that cylinder will have to dump the oil very fast to get the pounding effect. Ours is a single acting cylinder with no oil on top of the cup. ralph



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T_Bone

12-26-2000 10:27:13




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 Re: Old Hydraulic Cylinder in reply to Skinner, 12-26-2000 03:29:57  
Hi Skinner, What you might consider is using a fulcrum lift on your 450lb weight. Short stroke the hydraulic clinder end and long stroke the driving end. Another thought, are you sure your posts can handle a 450lb hammer blow? A 3.5" bore X 2" rod will push 40k/lbs and pull 36k/lbs.

T_Bone



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E. Borchardt

12-31-2000 16:37:44




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 Re: Re: Old Hydraulic Cylinder in reply to T_Bone, 12-26-2000 10:27:13  
T bone,
At what pressure?



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T_Bone

12-31-2000 20:32:30




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 Re: Re: Re: Old Hydraulic Cylinder in reply to E. Borchardt, 12-31-2000 16:37:44  
Hi EB, at 2000psi

T_Bone



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Earl Borchardt

12-31-2000 21:27:27




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 Re: Re: Re: Re: Old Hydraulic Cylinder in reply to T_Bone, 12-31-2000 20:32:30  
T_Bone,
Better go over your numbers. Your results do not agree with F=PA.



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T_Bone

01-03-2001 07:16:37




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 Re: Re: Re: Re: Re: Old Hydraulic Cylinder in reply to Earl Borchardt, 12-31-2000 21:27:27  
Hi EB, Those wern't my numbers but International Harvesters numbers I took out of the book. I went back to find where I read it and do you think I could find it again? No such luck for now but will post them when I find it again. I'm pretty close on what IH quoted tho and didn't give it any thought if they were correct as I've never seen info like that printed before.

T_Bone



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T_Bone

12-26-2000 10:25:34




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 Re: Old Hydraulic Cylinder in reply to Skinner, 12-26-2000 03:29:57  
Hi Skinner, What you might consider is using a fulcum lift on your 450lb weight. Short stroke the hydraulic clinder end and long stroke the driving end. Another thought, are you sure your posts can handle a 450lb hammer blow? A 3.5" bore X 2" rod will push 40k/lbs and pull 36k/lbs.

T_Bone



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Steve from Tn

12-26-2000 07:41:43




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 Re: Old Hydraulic Cylinder in reply to Skinner, 12-26-2000 03:29:57  
Hey Skinner, You might be able to use the cylindars that are used to dump the cotton out of cotton pickers. I don't know exactly how long they are, but they are loooong. There are several tractor yards in Sikeston, Mo that sell used tractor, combine and picker parts. That's about as far north that you will find cotton pickers. I hope this works. Any other time, I would have a farm mag. laying around with their phone no. I did find one in Decatur,Al Ph.# 256-353-5661

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Skinner

12-26-2000 18:43:57




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 Re: Re: Old Hydraulic Cylinder in reply to Steve from Tn, 12-26-2000 07:41:43  
Boy, did I fall into a bucket! I bought the entire mast from a Cat 5000# forklift today complete with tilt, side to side, and lift cylinders for $100. Took it home, hooked it up and everything works great. I removed the return safety valve (restrictor) and when I dump the fluid she drops like a rock! I will send pictures when I'm done. I think I will use a seperate PTO pump and tank as I don't want that surge of pressure hitting my tractor hydraulics leading to leaks everywhere.

I will have side to side, plus side to side angular, plus tilt so she ought to line up on just about any terrain. Mount a couple of levels on the side and go to town.

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Taylor Lambert

12-26-2000 18:38:28




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 Re: Re: Old Hydraulic Cylinder in reply to Steve from Tn, 12-26-2000 07:41:43  
I have one i made that i use behind my Cub. i got a 2 stage double acting cylinder off a carhauler trailer in the junk yard. i made a rail out of 2 pipe then welded an end in them and made my hammer slide between them. the cylinder raises them up 10 feet then i have a pivot in the cylindr bottom, i have a lever the pulls it out from under the hammer weight. wors good. pretty fast to.



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