[TheForge] hydraulic pump

Tue Mar 18 20:16:00 2003

I'll second Ralph on electric motor rpm on a two stage pump. I initially 
ran mine at 3600 rpm, and it really screamed. 1750 rpm is much nicer.

At first I had mine set up for 2" per second (when not under load). This 
is *way* too fast, a bit scary. 1" per second is plenty.

Steve Smith

Ralph Sproul wrote:
>         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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> 
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