Logsplitter 2.0

   / Logsplitter 2.0
  • Thread Starter
#311  
Finishing up the welding on the 4-way ... probably be done within the hour ... then time for some testing.

And pics of course.
 
   / Logsplitter 2.0
  • Thread Starter
#312  
Well, things didn't go quite as I had hoped ... best laid plans and all that ... :rolleyes:

Got the 4-way wedge essentially done ... turned out ok, but not perfect. It does slip over the fixed wedge on the beam both ways with no problem (flippable) ... but it's loose enough that it cocks a bit and will jam on ... so you can't just pull it off. So far, tapping it with a plastic HF deadblow hammer un-wedges it so it can be removed/flipped.

Biggest surprise was that even with the 3" cylinder, the log lift would not pick up a large round (30" mebbe ?) It was fairly heavy ... at least several hundred pounds I'd guess. Think it may have been some ash that appeared to be dead already when they delivered it.

The cylinder did have enough power however to snap the welds on one of the pieces of 1" solid square bar stock that I used to build the brackets on the log lift for the attachment of rod end of the cylinder, after repeated attempts to lift the round. Probably need some gusseting.

I think part of the problem is the initial angle of the cylinder lacking enough mechanical advantage to get started.

After trying to lift that round and failing, I decided to just try splitting something with the 4-way that I could lift up onto the beam, so I grabbed a round of that Sycamore that they brought me last year ... was probably 20" or so in diameter. This stuff was very green when I got it but it has been drying for almost a year. It has a very twisted grain and when I tried splitting it green last year, the splitter couldn't handle larger pieces. Tried it with the 4-way and that wouldn't touch it. Tried it with just the fixed wedge and that wouldn't touch it either. Kills the engine at around 2000 psi ... which brings me to the next issue.

The engine is still leaking a considerable amount of oil ... way too much to ignore.

It's not coming out of the valve cover, so I did manage to get that sealed ... but may be coming out of either the crank seal or the base of the jug ... or perhaps both. It was getting dark around the time I was messing with this, so I need to look at it in the light and see if I can figure out where it's coming from.

I tried adjusting the unloader and was still able to the kill the engine on any settings I tried - whenever the pressure built to 2000 psi.

Kinda surprising ... since the engine (theoretically) should have enough power to drive the pump at 2500 psi in low flow/high pressure mode ... although using Surplus Center's calculator it says it is for electric motors and to double the hp requirements for gas. Based on the pump displacement, it is only flowing 3.02 gpm in lo flow mode.

The engine - 6.5 hp Briggs - is perhaps marginal for this pump (Barnes 1300486 - spec sheet: Concentric AB HI LO PUMP US) ... so I'm considering a re-power, and maybe going with a 8 hp Predator from Harbor Freight ... rather than messing around an old engine that may have multiple issues.

A 13 hp Predator is another possibility ... one advantage being it has electric start and plenty of power I would think ... but it's way more expensive ($359 vs. $239)

May have to change at least one half of the Lovejoy coupling with either of them, depending on the shaft sizes.
 
   / Logsplitter 2.0 #313  
Yea, 6-6.5 HP engines are normally paired with the 11 gpm pump.

With yours being a tad more at 13.....in combination with a tired engine.....I think an 8hp motor is a wise call. Get that pressure back up to 2500 +/- and that might have made the difference in the log lift.

Got any specs on the log lift, or some measurements, And I can figure out what your theoretical lift cap should be? Even just a sketched 2-d drawing showing cylinder, lift , and pivots, and I can tell you what numbers I need.
 
   / Logsplitter 2.0 #314  
I found an older picture, assuming it's still the same design, I'm post 272.

Reference this pic
IMG_20160831_133901157-1200x2133.jpg

What are the lengths AB, BC, AC, and AD when o. The ground. And what does BC become when raised?

The design of that lift, (similar to a front loader) is such that the lifting force is greatest at the lowest position. And gradually diminishes as it is raised, as angle c becomes less and less. But at some point the round will start rolling toward the splitter, and the load the cylinder needs to lift it also lessens
 
   / Logsplitter 2.0
  • Thread Starter
#315  
Yea, 6-6.5 HP engines are normally paired with the 11 gpm pump.

With yours being a tad more at 13.....in combination with a tired engine.....I think an 8hp motor is a wise call.
I'm just wondering if 8 hp is going to be enough ... :confused3:

The engine didn't have too much of a problem with the easier stuff last year, splitting mostly ash and some pine. The pine was tougher ... but it seemed to cut right through the knots without too much trouble.

Probably going to have to redo the mount for the engine, whichever one I go with.

Get that pressure back up to 2500 +/- and that might have made the difference in the log lift.
Yeah ... the difference in 2000 psi vs. 2500 psi is around 3500 more lbs of force: 14137 vs 17671.

Need to check the pressure and make sure it is only developing 2000 psi ...

Got any specs on the log lift, or some measurements, And I can figure out what your theoretical lift cap should be? Even just a sketched 2-d drawing showing cylinder, lift , and pivots, and I can tell you what numbers I need.
I can take some pics and include some measurements.

The cylinder for the log lift was almost vertical ... need to get a little more angle on it I think ... but I'll need to relocate the base end attachment point ... :(
 
   / Logsplitter 2.0 #316  
I can take some pics and include some measurements.

The cylinder for the log lift was almost vertical ... need to get a little more angle on it I think ... but I'll need to relocate the base end attachment point ... :(

Get them measurements and I can do some numbers and we can go from there.
 
   / Logsplitter 2.0
  • Thread Starter
#317  
Here's the measurements:

On the ground:

AB = around 6" ... a whisker under ... mebbe 5 7/8" (log lift hinge pin to cylinder base end attachment point pin)

BC = 18 1/4" (cylinder base end attachment point pin to rod end attachment point pin, retracted)

AC = 25" (log lift hinge pin to cylinder rod end attachment point pin, retracted)

AD = 34 1/2" (log lift hinge pin to center of log lift base panel)

Raised:

BC = 26 1/4" (cylinder base end attachment point pin to rod end attachment point pin, extended)

All measurements involving pins are from the center of the pin.
 
   / Logsplitter 2.0
  • Thread Starter
#318  
Confirmed that the engine dies at 2000 psi by retracting the log lift cylinder.
 
   / Logsplitter 2.0
  • Thread Starter
#319  
Broken weld:

IMG_0571.jpg
 
   / Logsplitter 2.0
  • Thread Starter
#320  
Side profile of the log lift, show the relation of the hinge pins and rod end cylinder attachment point:

IMG_0573.jpg
 

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