Results 1 to 8 of 8
  1. #1
    New Member
    Join Date
    Apr 2012
    Posts
    5
    Location
    Pelverata Tasmania
    Tractor
    Massey

    Default Another Log Splitter Question

    Hi I am new here but have often viewed the great advice given regarding hydraulics.

    I am building a wood processor - I'll post some pics later. It has twin Cassapa 20gpm open centre tandem pumps, a 30hp kubota diesel, a lifting table/ram/spool, a log splitter spool feeding a 4"x2"x18" cylinder and a hydraulic motored 12' conveyor attached.

    Question, how to power the whole circuit

    I'm thinking of combining the pump outflows and feeding these first to a 2 spool valve block with PB facility - one spool for the lifting table (with in-line one-way reducer) and the other a motor control spool feeding perhaps a priority valve for conveyor speed control and then taking the PB to feed the detent splitter valve. The hyd motor will run all the time.

    Will the motor (an axial piston type running at low revs) rob the splitter valve too much or conversly, will the splitter valve opening stall the motor?? I don't want to get into flow dividers as they will cause heat build up, I think.

    Any thoughts or advice are most welcome

  2. #2
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    16,760
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Another Log Splitter Question

    It will take about 41 HP to run a single 20 GPM pump at 3000 psi.

    If you use a motor spool in the same valve, with a log splitter, you will share the fluid, when the other spool is activated, thus reducing the speed. Not a big deal on a conveyor.

    If you want the hyd motor to run at a constant speed, you will need a splitter or flow divider.

    If you have two pumps, use a solenoid operated motor spool valve, with relief on one of the pumps.

    Don't think you have enough HP for both pumps, and the 30 HP engine will stall out under load.

    Your 30 HP will do a 14.6 GPM pump at 3000 psi.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  3. #3
    New Member
    Join Date
    Apr 2012
    Posts
    5
    Location
    Pelverata Tasmania
    Tractor
    Massey

    Default Re: Another Log Splitter Question

    Many thanks for the prompt reply.

    Yes the HP may be a bit shallow for 20gpm but I guess the ram is not going to take that much under load being only a 4"dia with 2" rod. I toyed with a 4.5 or a 5" ram but was advised against it due to HP requirements exceeding my 'free' kubota motor. The wood we have in Tas is rated mid-strength and most splitters here use this size ram quite sucessfully.

    Yes there are 2 pumps so a solonoid operated motor spool valve is a possibility but could be quite expensive I think

    Given the splitter ram spool will be operated from the PB on the combined first valve block (ie., the one operating (occasionally) the lifter table and (constantly) the conveyor motor), do you think operating the splitter valve will stall out the conveyor motor completely because (without a divider) all the supply will flow to the splitter ram?

    PB arrangements always befuddle me in terms of how the oil actually flows in a PB arrangement.

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    16,760
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Another Log Splitter Question

    PB means power beyond or a supply for fluid for downstream operation. The tank port was not designed for high pressure operation. If all valves have PB, then the PB from all valves are connected in series, as in PB to IN port, and so on. The last valve does not need PB as it is going to tank.

    A solenoid motor valve would only be around $150 and you need the subplate

    Surplus Center - 12 VDC 10 GPM OC MOTOR SPOOL SOLENOID VALVE
    Surplus Center - 1 STATION DO3 SUBPLATE OPEN CENTER

    As far as stalling out the motor, what it will do is take part of the fluid and slow down the hyd motor.

    If you want constant speed on the conveyor, you need a separate hyd supply or a splitter/divider.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    New Member
    Join Date
    Apr 2012
    Posts
    5
    Location
    Pelverata Tasmania
    Tractor
    Massey

    Default Re: Another Log Splitter Question

    Again many thanks, and not so costly in the USA.

    The circuit I have in mind is this one, but with one of the first-fed spools replaced with a motor spool - see http://www.google.com.au/url?q=http:...IqrRhk15wUMyGw

    Should work?

  6. #6
    New Member
    Join Date
    Apr 2012
    Posts
    5
    Location
    Pelverata Tasmania
    Tractor
    Massey

    Default Re: Another Log Splitter Question

    ..but maybe not if when operated, the motor spool closes off the PB. So it would seem a splitter is the best option

  7. #7
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    16,760
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Another Log Splitter Question

    Are you sure that valve has a motor spool kit?

    Best way would be to go to a stacked valve, and add options to suit your purpose.

    Surplus Center - 3 SPOOL SV VALVE OPEN CENTER
    Last edited by J_J; 04-05-2012 at 08:03 AM.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  8. #8
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    16,760
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Another Log Splitter Question

    You could also use an open center valve not a tandem center valve for motor control.

    Tandem center spools lock the cyl or motor, and are not used for hyd motor circuits.

    You probably want a motor spool valve with detents, to lock the motor on.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

Similar Threads

  1. log splitter hydralic question
    By jockum in forum Hydraulics
    Replies: 5
    Last Post: 02-23-2011, 11:05 AM
  2. Log Splitter Question
    By bstnh1 in forum Attachments
    Replies: 17
    Last Post: 08-27-2010, 04:53 PM
  3. New and yup, ANOTHER log splitter project
    By Wineslob in forum Build-It Yourself
    Replies: 32
    Last Post: 11-04-2009, 05:39 PM
  4. Mini Splitter Air/Hydraulic Log Splitter
    By BobRip in forum Build-It Yourself
    Replies: 7
    Last Post: 01-13-2009, 09:40 PM
  5. 3Pt Log Splitter Hydraulics Question
    By centex in forum Attachments
    Replies: 4
    Last Post: 12-06-2006, 05:26 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.