ArboristSite.com Sponsors
 
 


Can a hydraulic splitter be to fast

Discussion in 'Firewood, Heating and Wood Burning Equipment' started by Gamedic, Jan 4, 2012.

  1. Gamedic

    Gamedic ArboristSite Member

    Joined:
    Feb 10, 2011
    Messages:
    56
    Likes Received:
    6
    Location:
    North Georgia
    I was playing around on a log splitter speed calculator I found online. I filled in all the fields with different size cylinders and pumps just to get some ideas. One of the calculations was a 3 1/2 inch cylinder with a 20 inch stroke and paired with a 22 gpm pump.The cycle time was 4 seconds. I know that sounds ridiculous, but I started thinking. Is such a thing even possible or would the internals of the cylinder self distrucked under that kind of speed. I don't know anything about hydraulics. but I figured you guys could answer my question. Thanks.
     
  2. TXTreeSurgeon

    TXTreeSurgeon ArboristSite Operative

    Joined:
    May 15, 2010
    Messages:
    105
    Likes Received:
    20
    Location:
    Duffau, TX
    I am no expert, but I have seen tractors and backhoe's using hydraulics with faster cycle times than that. Seems to me like the faster the cycle time, the better! By the way, my dad is building a woodsplitter for me and I would like to make sure the cycle time will be fast enough. Can you post the link to that calculator?
     
  3. Somesawguy

    Somesawguy Addicted to ArboristSite

    Joined:
    Oct 28, 2009
    Messages:
    1,872
    Likes Received:
    412
    Location:
    Maine
    You have to remember that those numbers are without a load. Once you get into the wood, the pump will slow down to whatever the 2nd stage will pump. Usually it's around 16gpm or so.
     
  4. lone wolf

    lone wolf MS 200T King

    Joined:
    Oct 5, 2009
    Messages:
    47,124
    Likes Received:
    33,474
    Location:
    Prowling The Pine Barrens
    Sounds insane to me.That is way to fast to be safe.
     
    Jed1124 and sb47 like this.
  5. Gamedic

    Gamedic ArboristSite Member

    Joined:
    Feb 10, 2011
    Messages:
    56
    Likes Received:
    6
    Location:
    North Georgia
  6. sam-tip

    sam-tip Firewood Helper

    Joined:
    Dec 21, 2011
    Messages:
    1,375
    Likes Received:
    2,677
    Location:
    Central IOWA
    I use a 4" cylinder with 24" stroke with a max of 27 gallons/min (Bobcat Toolcat with highflow). Love it. Never measured the time but it is fast and keeps going.

    I would realy like to try 36.5 gallons/min on a 5" cylinder with 30" stroke.
     
  7. MNGuns

    MNGuns [INSERT COOL STUFF HERE]

    Joined:
    Aug 3, 2008
    Messages:
    2,780
    Likes Received:
    1,416
    Location:
    Princeton MN

    Kinetic splitters claim a 3 second cycle time and I've still got all nine of my fingers.. ;)
     
    Ductape likes this.
  8. MNGuns

    MNGuns [INSERT COOL STUFF HERE]

    Joined:
    Aug 3, 2008
    Messages:
    2,780
    Likes Received:
    1,416
    Location:
    Princeton MN
    Keep in mind the heat it will generate and what you need to do to cool it.
     
  9. Hddnis

    Hddnis Addicted to ArboristSite

    Joined:
    Sep 4, 2007
    Messages:
    3,481
    Likes Received:
    1,155
    Location:
    PNW


    The calculator you posted gives a time of almost 5 second for these specs (assuming a 1 1/2" rod), not 4.


    Here are some more calculators that let you know force as well. Surplus Center - Tech Help


    Such speeds are no problem. Modern skid-steers and mini-excavators run much faster than that all the time, all day long. You'll need to make sure you have a hydro oil cooler when you start pushing the speeds.





    Mr. HE:cool:
     
    Last edited: Jan 4, 2012
  10. TXTreeSurgeon

    TXTreeSurgeon ArboristSite Operative

    Joined:
    May 15, 2010
    Messages:
    105
    Likes Received:
    20
    Location:
    Duffau, TX
    Couldn't you keep the heat down by having more hydraulic oil capacity? It seems that 5 gallons of hydraulic oil could be run at some pretty high speeds before it overheats. I guess it all depends on how fast we are talking, but I think I would just prefer a large oil reservoir instead of running an oil cooler.

    Maybe I am off-base, what do you guys think?
     
  11. Hddnis

    Hddnis Addicted to ArboristSite

    Joined:
    Sep 4, 2007
    Messages:
    3,481
    Likes Received:
    1,155
    Location:
    PNW


    More oil is one way to do it.

    There are plenty of guidelines published on designing splitter systems, including cooling. I tend to lean towards more cooling is better.



    Mr. HE:cool:
     
  12. CJ1

    CJ1 ArboristSite Guru

    Joined:
    Apr 8, 2011
    Messages:
    902
    Likes Received:
    304
    Location:
    MICHIGAN
    No you are not off base, I used a 20 gallon res and could run basically all day with fuel breaks and such. 24 GPM 6.5 second cycle times. More surface area=more cooling and time to heat up. 5 gallons, you would be hot in 45 min even with good plumbing unless it was 20 deg out. CJ
     
  13. moose5180

    moose5180 ArboristSite Operative

    Joined:
    Mar 31, 2011
    Messages:
    145
    Likes Received:
    46
    Location:
    Wyoming, USA
    I think my home made splitter is about 12 seconds.
    This is about as fast as i can work, so anything faster would be a waste and probably take some fingers with it.
    Personally i would not want one faster than about 8-10 seconds just for the safety factor.
     
  14. Kevin in Ohio

    Kevin in Ohio Addicted to ArboristSite

    Joined:
    Jan 2, 2009
    Messages:
    1,696
    Likes Received:
    1,980
    Location:
    Ohio Stop Jawin' and start Sawin'

    Here's a way to think about it. With a 28 gpm pump you empty and fill it over 5 times EVERY minute with a 5 gallon tank. Elbows, valves and smaller lines all restrict it and adds to the equation. If you run your splitter for hours it's easy to see how the heat builds. Hope this helps.

    For a 28 gpm pump I was always told you need about a 30 gallon tank.
     
    mr.finn and c5rulz like this.
  15. blades

    blades Addicted to ArboristSite

    Joined:
    Nov 19, 2008
    Messages:
    3,321
    Likes Received:
    1,907
    Location:
    SE WI
    Harbor Freight 30t with OEM plumbing 11 gpm pump about 5 gallons fluid in system do not remember cycle time, not fast. After about an hour of constant use you would not want to touch the cylinder for fear of getting blisters. Constrictions of all kinds plus an improperly located return line on the tank created the excess heat. Just to give an example of what friction in hydro system can result in.
     
  16. flyboy553

    flyboy553 Oakaholic

    Joined:
    Jan 23, 2011
    Messages:
    1,337
    Likes Received:
    927
    Location:
    Central Minnesota
    Only one thumb? Or still have all three?
    Ted
     
  17. flyboy553

    flyboy553 Oakaholic

    Joined:
    Jan 23, 2011
    Messages:
    1,337
    Likes Received:
    927
    Location:
    Central Minnesota
    Can a splitter be too fast? NO
    Can an operator be too slow? Yes

    Ted
     
    GVS and kevin j like this.
  18. CRThomas

    CRThomas ArboristSite Guru

    Joined:
    Mar 15, 2011
    Messages:
    901
    Likes Received:
    213
    Location:
    Southern Illinois
    Speed

    I took a three point 20 log splitter mounted it on a steel table a three hp electric motor. A 12 gpm pump a five gallon tank never over heats and it's faster than me. Run 6 hour in 80 to 90 degree weather. Never over heat. I also have a 20 ton on my tractor with princes 24 gpm pump it is faster than me. It has a 5 gal tank on it no over heat. I went to the 500 mile race one time didn't care for it. Speed does not split a lot of wood consistent does. That's my thought for now
     
    Sandhill Crane likes this.
  19. Haywire Haywood

    Haywire Haywood Fiscal Conservative Social Retard

    Joined:
    Aug 19, 2006
    Messages:
    6,299
    Likes Received:
    2,131
    Location:
    Kentucky
    I've got a 28gpm pump and a 15 gallon tank on my splitter, and I can vouch for the fact that it gets hot after an hour of running. If I were to build it again, the tank would be bigger, the baffles inside would be different, and the return would be in a different place on the tank. Actually, the pump is rated for 28gpm but that's at 3600rpm, but the older engine running it only goes 3000. I have about a 6-7 second cycle time with my 4x24 cylinder.

    Ian
     
  20. indiansprings

    indiansprings Firewood Purveyor

    Joined:
    Dec 15, 2008
    Messages:
    4,009
    Likes Received:
    1,101
    Location:
    SW Missouri
    Nope, can't make them too fast. Safety is in the hands of the operator.
     
    kevin j likes this.

Share This Page