Eucalyptus splitter.

[wade23454]

Your pump size is way too big and will result in a 13 ton max output. If you use a 13GPM pump, you'll get 30 tons of force.

My math should be verified by an expert, lol.

Edit: Guess you can get two stage pumps that give the speed/force combination you are looking for.

http://www.ebay.com/itm/28-GPM-2-ST...ics-Wood-Splitter-/271303389853#ht_382wt_1126

 

[simonsays]

Your pump size is way too big and will result in a 13 ton max output. If you use a 13GPM pump, you'll get 30 tons of force.

My math should be verified by an expert, lol.

Edit: Guess you can get two stage pumps that give the speed/force combination you are looking for.

http://www.ebay.com/itm/28-GPM-2-STAGE-HYDRAULIC-LOG-SPLITTER-PUMP-ToolTuff-Hydraulics-Wood-Splitter-/271303389853#ht_382wt_1126

What was that limiting factor you came up with?

Here is what I was thinking.


http://www.surpluscenter.com/Hydrau...-Pumps/28-GPM-DYNAMIC-2-STAGE-PUMP-9-7971.axd

 

[simonsays]

Doing some calculations of a cylinder with a 5" bore running @ 3000psi.... I only come up with 29 tons of force. I was hoping to do more for this build. I have been trying to source a cylinder with a 5.5" or 6" bore at a reasonable price but have come up short.

 

[wade23454]

I'm new to log splitters, so didn't know that they use a "two stage" pump. The high capacity stage pumps until resistance is met, and then it automatically shifts to the smaller stage. The smaller the gpm of the pump for a given motor HP and cylinder bore size, the higher the force exerted. If you 28 GPM pump is actually a two stage with a 20 gpm and 8 gpm per say, then the smaller gpm would give you the force you want.

 

[simonsays]

I'm new to log splitters, so didn't know that they use a "two stage" pump. The high capacity stage pumps until resistance is met, and then it automatically shifts to the smaller stage. The smaller the gpm of the pump for a given motor HP and cylinder bore size, the higher the force exerted. If you 28 GPM pump is actually a two stage with a 20 gpm and 8 gpm per say, then the smaller gpm would give you the force you want.

Correct!

 

[wade23454]

What was that limiting factor you came up with?

Here is what I was thinking.


28 GPM DYNAMIC 2-STAGE PUMP

The pressure exerted at engine stall on the 7gpm pump would be almost 5400 psi without a relief valve. Since it's pressure is rated at 3000 psi max, then max force exerted would be 29 tons as you stated. Guess you would need a bigger diameter ram to get more force, or a higher pressure rated pump/system.

As a reference, there is a log splitter on northern tool that exerts "37 tons", and it has a 5" ram, but 3500 psi max pressure setting. In the specs, it lists continuous force as 34.3 tons. You would need 3770psi to get real 37 tons.

Sorry for the thread jack, you are helping me build my log splitter also.

As for your original post, I would guess that the hedge apple trees in the midwest would most closely resemble the "springiness" of the eucalyptus tree.

 

[simonsays]

5" x 24" looks to be the biggest I want to go for the money. A 6" x 24" is more than double.

 

[simonsays]

Well the search it continuing. I found a 6"x25' ram at a recycling center/ junkyard. Got it for scrap price…. $45 :drink: Seams to be in decent shape.

 

[wade23454]

I'm sure you meant 25", lol. That would be a real tree splitter otherwise. Sounds like you are well on your way to an industrial stregth splitter.

 

[Aussiebushman]

Red Gum is one of the most sort after fire woods around here 25 ton rams will handle nearly everything.

You are splitting redgum for firewood?? Have you no soul?

Alan