[TheForge] hydraulic pump

Tue Mar 18 22:26:01 2003

Dave & Ralph,

Northern Hydraulics has an outlet store in Hudson WI, and you can get the
pumps and cylinders for about 1/2 price there.  I say about because
sometimes they are miss-marked and you can get a deal of a deal.

Northern Tool Outlet
1701 Ward Ave
Hudson, WI  54016-2129
(715) 377-1620

Matt is the manager and is extra helpful.  They don't always know what they
have, as I just alluded to though.

I bought a 28 GPM 2-stage pump which I figured would give me .47 in/sec and
1.9 in/sec with a 6" cylinder and a 1725 rpm motor, about 7 hp electric
motor required.  I think it cost me about $80 and still had the plastic port
covers on it.  It was marked cheaper than a 16 gpm pump.

What do you think of those speeds?  I sort of guessed between Batson's book
and the lies I heard here.

Ed

----- Original Message -----
From: "Ralph Sproul" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 18, 2003 5:52 PM
Subject: Re: [TheForge] hydraulic pump

>         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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