[TheForge] hydraulic pump

Tue Mar 18 18:39:01 2003

        Dave,  Correct on the pump not being a two stage.  Hydraulic
equipment has more HP and needs high volumes of fluid moved to deal with
their work requirements.

        Chuck's comments on the Batson Plans being something to read is a
good suggestion.
        Rule #1 in Hydraulics.  1Hp(electric) = 1 GPM @ 1500 psi.    You can
not run a 10-20 GPM pump(from a fork lift) with a 2-5 hp motor with any
success at all.
        The two stage pumps are the way to go.  The pump you select is
determined by the RPM of the motor you use.  The two stage pumps are rated
at 3600 RPM for log splitters and gas engines being set on run which is
about that speed.
        To listen to an electric motor run hydraulics at the
speed.............good luck, break out your hearing protectors!   I prefered
to run the 16 gallon/4 gallon per minute pump(rated at 3600 rpm) on a 1750
RPM motor.......thus giving me 8 gallons per minute in the low pressure
section (for speed -1" per second) and 2 gallons per minute in the high
pressure section for reaching 36 tons of force with my press(at 1/4" per
second travel speed -with a 6" cylinder).

        If you totally understand what I just wrote.......have fun building
your press............if you don't get what I just said, buy the Batson
plans and read them until you understand them.  That is my advice.

Ralph


----- Original Message -----
From: "Dave Brown" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 18, 2003 11:51 AM
Subject: Re: [TheForge] hydraulic pump


> At 06:10 03/18/03 -0500, you wrote:
> >         The pump of a press is the heart of the tool, my advice is to
buy a
> >new two stage pump to start with.  I put three used valves on my press
> >trying to save money - they all leaked. There is usually a reason that
> >hydraulics are in the junk yard (I've found them to be less than a 50/50
> >chance of being what you'd like).  New is pricey, but clean.
> >
> >Ralph
>
>  From what I was told, the lift was scrapped because of the drive wheel
and
> motor.  The hydraulics were, presumedly, in good working order.  But you
> have a good point.  However, it may be worth it to go back and scrounge
the
> fluid reservoir and maybe some hoses which look pretty new.
>
> Also, am I correct in getting the inference from you and Roger Degner that
> the pump on these lifts is probably NOT 2-stage?
>
>
> Dave Brown
> Heritage Smithing
> Green Bay, WI
> ABANA, UMBA, GoM, MODA, ARG
>
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