Through boredom mainly, I found myself perusing the log splitters for sale on tm this arvo. A lot of the new splitters for sale seem to have quite impressive ratings or the size of the ram, which got me thinking a bit. I grabbed the calculator and started working out the actual pressure on the wedge, and it was far from what was being quoted. For example, a "15 ton" splitter, with an ID of 80mm, (3.149 inches) and a maximum hydraulic pressure of 3000 psi, can only exert 10.6 tons of force.
Misleading or what!
nathanmac,
Oct 13, 6:19pm
They'll be for splitting balsa wood, cobber.
You won't be needing any firewood soon.
gammelvind,
Oct 13, 7:01pm
Metric or imperial tons!
taipan4,
Oct 13, 7:03pm
yup you are onto it, unlike many people buying logsplitters or the people selling them, 30 tons & 6 hp (must have a cycle time of 20 secs) My home built has a hiab leg for the ram & a 60l min pump I have done the calcs fitted a pressure gauge (2250 psi)done the math & it works out to 9.5 tonne so go figure. Oh & the complete cycle time no load is 7 secs
NZTools,
Oct 13, 8:00pm
Dont get me wrong, some of those two stage pumps are pretty fast with no load, but once the little second stage kicks in, they are as slow as a wet week I have a big motherflucker of a splitter that i built a few years ago, which runs a 4 inch id ram, and is driven by a 150hp tractor. The cycle time is bordering on dangerous, and it is just a tad over 18 ton at 3000 psi. Fortunately, with the tractor's flash hydraulics, I can electronically control the flow in both directions to tame it down a bit.
I wonder is some of these sellers on here even have any clue that they are misrepresenting their goods.
NZTools,
Oct 13, 8:02pm
Metric, but even if i work it out in imperial tons (which we dont use any more) it still doesnt come close to measuring up.
NZTools,
Oct 13, 8:03pm
Have you not noticed almost every house in Queensland has a logburner! They keep telling me it can get quite cold over there. i reckon they are soft. lol
taipan4,
Oct 13, 8:04pm
yep so you have 150 hp& 3000psi = 18 ton, yet they are getting more thanthis with a fraction of the HP, perhaps math/hydraulic theory was not their strong point in 5th form science
gammelvind,
Oct 13, 8:08pm
True, just had a fiddle with the figures too, I think some one selling the splitter is a fisherman, "really it was thaaaat big" lol.
flagheaven,
Oct 14, 7:53am
maybe they are splitting hairs !
rsr72,
Oct 14, 1:14pm
Ask 'em for a copy of the test certificate proving their claims, or threaten to report them to the Commerce Commission, and OSH even.
whqqsh,
Oct 14, 5:37pm
I dont care much, as long as they split logs, cycle time doesnt matter too much unless youre doing it as a business. Mine struggles a bit with gum at times, especially knotty stuff but a bit of patience & its all good, like I said, time doesnt matter too much
snoopy221,
Oct 14, 7:17pm
Ya knoe Pete tis all in how big ya ram is and how fast ya pumpin.aye. [Wonder why my pump gauges 52. not 3-lol] Incedentaly most splitters are guessed as a 3000 pump-not many actually give the pump P S Ijust ram bore and tonnage.
NZTools,
Oct 14, 7:24pm
The guy I was lookin at on here gave all the specs, including the pumps max psi, and ram ID. the problem was his maths wasnt too flash. lol
NZTools,
Oct 14, 7:40pm
Love it.
mokaubach,
Oct 15, 1:54am
Just like most of the Chinese crap for sale these days, overrated and sub standard.
daz59,
Oct 15, 7:05pm
Bit hard to compaire as the 150hp isnt used 100% to run the pump, Most big tractors flow 100L a min or under. 20hp with a two stage pump will flow that.
NZTools,
Oct 16, 5:05am
Yes but the tractor is stillmlimited by the flow control, and the releif valve on the logsplitter. The same applies wether it be a150hp tractor diven splitter or 5.5hp b&s driven splitter. it is maximum pressure X area of the piston = tons of force. The one difference between large and small, is the small spliiter has to use it's tiny second stage of the puimp to achieve it's max pressure, which is painfully slow compared to it's unloaded full flow speed.
the-lada-dude,
Oct 16, 5:42am
v good article on wood splitters in the SHED magazinejune/july 2012
splinter67,
Oct 16, 5:43am
Buy an axe and yo willl get buff quick
treecave,
Oct 16, 6:02am
as a rule i wouldnt touch a chinese made log splitter but a neighbour got one through a TM deal and it goes amazingly well. has one of those knock off honda motors too which arent always that good.when i saw it first time i thought that it was way too light in the frameto split anything without folding up but i have seem him split some pretty chunky blocks so i guess not all chinese is cr@p.
daz59,
Oct 16, 1:53pm
NZTools, did you question the seller about it!
NZTools,
Oct 16, 2:06pm
Nope. With my username, it would justlook like I was shit-stirring. I doubt a lot of sellers would even know they were over rated. They would be taking the manufacturers word for it.
daz59,
Oct 23, 12:55pm
I questioned one guy that was selling one rated to 17ton, but by the size of piston and oil pressure he should only get 11ton, did question him about it but got no reply.
peacebird15,
Oct 23, 10:29pm
Alot of the saws are over rated to. how the cheap chinese using 25 to 1 can get more hp from less RPM than a reputable pro saw of the same size is beyond me. Oh wait they cant, they are lying.
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