[TheForge] hydraulic pump

Wed Mar 19 23:39:01 2003

Gee you have some amazing prices there, I just rang around here in Australia
and a 5hp 2500/700psi 8/4gal per minute would cost me $1200 thats $700 USD
then I need a coupling, bellhousing etc, another place suggested using 2
pumps one high flow one high pressure and a hi low valve to shut one out
when the pressure rises, this was more like $900 Aust. Where are the cheap
pumps :)!!

----- Original Message -----
From: "Ed F" <[email protected]>
To: <[email protected]>
Sent: 19 March, 2003 1:51 PM
Subject: Re: [TheForge] hydraulic pump

> 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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