Calculating hydraulic tonnage rating: Tractor Projects  -- General Tractor Discussion Forum and Review Calculating hydraulic tonnage rating: Tractor Projects -- General Tractor Discussion Forum

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 08-27-2006, 20:11 Post: 133718
kwschumm



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 Calculating hydraulic tonnage rating

Log splitters are typically rated in tonnage, like 20 ton or 24 ton. How is that tonnage calculated? I'm thinking a 4" cylinder has a surface area of approx. 3.14*4=12.56, multiplied by 2500 psi gives 31400, divided by 2000 lbs/ton = 15.7 tons. Is that correct? Or is the rating further affected by the surface area of the splitting wedge that contacts the face of the log?






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 08-28-2006, 05:49 Post: 133723
hardwood

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 Calculating hydraulic tonnage rating

KW; Your figures look correct to me. I don't know of another way to figure it. Frank.






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 08-28-2006, 08:42 Post: 133725
Murf

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 Calculating hydraulic tonnage rating

Ken, you're right on the money.

The "tonnage" is merely a measure of brute force though. The efficiency is a whole other matter, things like splitting edge shape and size, friction, etc., all affect how well that tonnage performs though.

I have used big splitters that didn't work worth a pinch of you know what, and also smaller ones that worked just fine.

Quality and good design seem to make more difference than brute force by a long shot. The same can be said about working with them, a well thought out machine is a joy to use, a bad one can be a bear to use at the best of times.

Best of luck.






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 08-28-2006, 13:23 Post: 133731
hardwood

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 Calculating hydraulic tonnage rating

We have a local fellow who is far from a dummy, but just never let his mind become too cluttered with formal education whom allways said the formula for the aeria of a circle was all wrong. His formula goes like this - Pi are round, Corn bread R square. Frank.






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 08-28-2006, 14:07 Post: 133732
DRankin



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 Calculating hydraulic tonnage rating

Yes.... but cobblers..... which are essentially the same as pi's, are square. Or at least rectangular.

So I'm thinking it was a cobbler guy who thunk that circle deal up in the first place..........






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 08-28-2006, 14:15 Post: 133733
kwschumm



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 Calculating hydraulic tonnage rating

Thanks for the help and humor guys.

I was trying to figure out how speeco rated my log splitter for 25 tons. It has a 4.5" cylinder, so piston area s/b around 15.9 square inches. Working backwards through the numbers it looks like the pressure should be about 3150 psi. They don't give much to work with specs-wise.






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 08-28-2006, 14:28 Post: 133734
DRankin



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 Calculating hydraulic tonnage rating

That seems like a high pressure. What are the hoses rated for? 3500 psi?

Most of our tractor/FEL's are in the 2400 psi range.






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 08-28-2006, 14:40 Post: 133735
kwschumm



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 Calculating hydraulic tonnage rating

The lettering on the hose is faded away and the hose should be replaced anyway. It's stiff and old and abraded to the cord in one spot. I'm wondering if this little 8 hp engine can deliver that kind of pressure along with 16 gpm the pump is supposed to be rated for.






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 08-28-2006, 14:53 Post: 133739
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 Calculating hydraulic tonnage rating

I called Speeco and they said everything on the splitter was rated for 3500 psi.






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 08-28-2006, 14:53 Post: 133740
Murf

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 Calculating hydraulic tonnage rating

Ken, if you can get make and model numbers off the engine and hyd. pump I can look up the spec.'s and tell you what it works out to.

It may be that they are 'optimistically' rating the power like air compressor manuf. do, quoting "peak" hp ratings and such.

I did a little surfing the Speeco site and compared what they say with my catalogues here. If, for instance, your unit had the typical 5.5 Honda with an 11 gpm 2 stage pump, it would make a MAXIMUM of 3,000 psi, based on that a 4.5" cylinder would make 47,713 pounds of push power, or 23.86 tons.

This however is absolute amximum, everything is perfect conditions numbers. I suspect you would, real world operating conditions, get more like about 15 - 18 tons, certainly plenty of power still.

Best of luck.






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