Point me in the right direction (Please)
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J_J
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jamtuc,
The limiting factor on hoses is the smallest hose, providing pressure and GPM, You say it is 3/8, so, what ever 3/8 will let flow in GPM is your limitation. You can use whatever you have, but you will still be limited by the GPM that the 3/8 hose will pass. Volume determines the speed of the cylinder. The cylinders ports might be 3/8. If you are going to be using QD's to hook up the tree cutter, I would suggest using one step larger QD, to prevent losses due to restrictions of the QD itself.
The limiting factor on hoses is the smallest hose, providing pressure and GPM, You say it is 3/8, so, what ever 3/8 will let flow in GPM is your limitation. You can use whatever you have, but you will still be limited by the GPM that the 3/8 hose will pass. Volume determines the speed of the cylinder. The cylinders ports might be 3/8. If you are going to be using QD's to hook up the tree cutter, I would suggest using one step larger QD, to prevent losses due to restrictions of the QD itself.
Scotty370
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As J_J sez: Volumn=Speed. The ultimate pressure (shear-force) will be the same with any size hose. I can't see any need for anything more than 3/8! I'd probably build it with 1/4"!!!
J_J
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As J_J sez: Volumn=Speed. The ultimate pressure (shear-force) will be the same with any size hose. I can't see any need for anything more than 3/8! I'd probably build it with 1/4"!!!
Since he will be cutting trees, he will want faster speeds, but will be limited to the 3/8 volume. I believe there is a way to hook up an accumulator to give a burst of fluid and if the hoses were larger, then more volume could flow, but the accumulator would have to be big enough to fill the cylinder at the operating pressure. During the rest period, the accumulator would fill.
J_J
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I wasn't sure, but I went back and read that he will be using a tractor, and the pump volume, hose size will be the limiting factor.
Here is an option. The pump below is for a log splitter, and jamtuc is building either a tree snipper, or a tree cutter. If you use tractor hydraulics, you have what is available. However if jamtuc were to take the pump below and add an electric clutch, and drive it off the fan belt, then he could get fast speed through some wood stock, and if the tree is tough, it would shift down to low volume and hgh pressure. He would have 22 GPM at 650 psi, and 6 GPM at 3000 psi, and to drive this pump would only take about 12 HP. The 22 GPM would definitly speed up cutting time on some stuff. He would need an add on reservoir also
https://www.surpluscenter.com/item.asp?UID=2009080914364589&item=9-4896&catname=hydraulic
I saw this little tree snipper on Ebay a while back.
Here is an option. The pump below is for a log splitter, and jamtuc is building either a tree snipper, or a tree cutter. If you use tractor hydraulics, you have what is available. However if jamtuc were to take the pump below and add an electric clutch, and drive it off the fan belt, then he could get fast speed through some wood stock, and if the tree is tough, it would shift down to low volume and hgh pressure. He would have 22 GPM at 650 psi, and 6 GPM at 3000 psi, and to drive this pump would only take about 12 HP. The 22 GPM would definitly speed up cutting time on some stuff. He would need an add on reservoir also
https://www.surpluscenter.com/item.asp?UID=2009080914364589&item=9-4896&catname=hydraulic
I saw this little tree snipper on Ebay a while back.
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J_J
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As a follow on,
There is a new automatic log splitter valve out that is automatic after you push both levers forward. It will cut and return/or open the cutting blades on the snipper, ready for the next cut. It ain't cheap, but handy. You could do the same thing with electric valves, with pressure switches, and stop switches.
There is a new automatic log splitter valve out that is automatic after you push both levers forward. It will cut and return/or open the cutting blades on the snipper, ready for the next cut. It ain't cheap, but handy. You could do the same thing with electric valves, with pressure switches, and stop switches.
Thanks guys for all the info and suggestions. I hope to get this thing completed on my next off hitch. (I work 7 on 7 off.) If it works I will try to post some pictures. I appreciate the input. Some of it OK alot of it is over my head. But I like to learn new things. I have to say I do learn alot from the TBN guys.
Alright fellas here goes. I do appreciate all the info and help. Here is the story. Finally finished the tree shear....whoo whoo.....
I got a lot of great info from you guys about how to route the Hydraulics from the loader valve. Man was I suprised when the Hydraulic Cylinder would not move. After investigation it would only move when the loader valve bypassed ( like when it is curled to Max) then I could activate the snipper. Whoo whoo again. Not so much. After cutting through some pieces of cedar log I had laying around I noticed the blade was pulling down on the cut. No big deal. Took the blade off did some sharpening on the other side of the blade. It cut straighter.
Thats when things went realllllly bad. I have never claimed to be an engineer. Well this proved out when a weld seperated and the snipper became scrap metal. It wasnt really that bad but if it was going to break I wish it would at least be a spectacular break. Those of you who have had a weld come lose know what I mean about the sinking feeling.
Anywho....thats that for this project for now. It was an expensive learning experience. I will break out the chainsaw with extra chains and get to work.
As far as the Hydraulic plumbing issue even Kubota said all I had to do was use the OUT port from the loader valve. But it didnt work. OH well back to the drawing board.
Thanks for the help guys
Jamie
I got a lot of great info from you guys about how to route the Hydraulics from the loader valve. Man was I suprised when the Hydraulic Cylinder would not move. After investigation it would only move when the loader valve bypassed ( like when it is curled to Max) then I could activate the snipper. Whoo whoo again. Not so much. After cutting through some pieces of cedar log I had laying around I noticed the blade was pulling down on the cut. No big deal. Took the blade off did some sharpening on the other side of the blade. It cut straighter.
Thats when things went realllllly bad. I have never claimed to be an engineer. Well this proved out when a weld seperated and the snipper became scrap metal. It wasnt really that bad but if it was going to break I wish it would at least be a spectacular break. Those of you who have had a weld come lose know what I mean about the sinking feeling.
Anywho....thats that for this project for now. It was an expensive learning experience. I will break out the chainsaw with extra chains and get to work.
As far as the Hydraulic plumbing issue even Kubota said all I had to do was use the OUT port from the loader valve. But it didnt work. OH well back to the drawing board.
Thanks for the help guys
Jamie
