[TheForge] 15Ton Press

Sun Jan 6 13:52:35 2002

Hey Ed,
The advantage of my design is that it minimizes side loading of the piston
seals at maximum ram extension with work off center in the dies, the
cylinder is not subjected to heating and flux spatter as the cylinder on top
is, the center of gravity is lower, the frame is lighter and smaller, and on
my basic design, the die working heigth is adjustable. (Steward didn't
include that option in his press).

Your design should work OK, but a problem area will be your top die sliding
frame, when you try to forge off center. We have made my style of press with
32" long cylinders cut down to 28"by modifying the attachment eyes. I
suspect that your cylinder will have a working travel of about 11" which is
a good length for using drifts, But your design will make this operation
difficult unless you use a heavy wall pipe for your base to provide
clearance for the drift.

In addition to the increase in HP that Steve mentions, Speeding up the pump
will dramatically increase the noise level and shorten pump life. You will
possibly create other problems in the system such as cavitation and higher
operating temperatures.

I would strongly recommend that you get a larger pump and properly sized
1800 rpm motor and use a flow valve to fine tune the ram speeds.

Jim Batson is a retired rocket scientist and he put a lot of research into
writing his hydraulics primer. The more you deviate from his recommendations
the deeper in DUDU you will be wading.

The recommended ram speed for blade forging is between 1 and 2  IPS.
Chuck

----- Original Message -----
From: Ed Fasula <[email protected]>
To: <[email protected]>
Sent: Saturday, January 05, 2002 10:27 PM
Subject: Re: [TheForge] 15Ton Press

> Hi Chuck,
>
>  >...have to be extremely tall to accommodate a 32" cylinder... There are
> enough advantages to my design over the cylinder on top that I
>  >wouldn't recommend that route.
>
>
> Oops.  Brain fart.  32" is the one for splitting wood.  The press cylinder
> is 6"x24"
>
> Here is a link http://www.geocities.com/edfasula/smithing.html
> to a sketch of the current thought I have for a structure.  I think I can
> keep it under 8' without too much worry.  Please criticize now, not after
I
> build it!  What disadvantages do you see with the cylinder on top?  While
> you're at it, let me know if you have any input on my plan with the pilot
> valve (there also).  [Also not how I try to pass of images from my scanner
> as digital camera pictures.]
>
>  >I'm not clear
>  >on why you need to vary the motor speed in a hydraulic system.
>
> Because I'll probably split wood with the pump (run out the forge door
with
> hoses with quick connects) and I want it to go fast enough.  But I hear
> (here) that the pumps scream at 3600 rpm.  I'm not sure what speed I want
> the ram to travel at.  Some in the book went 2"/sec.  That would take 3600
> rpm with the pump I'm looking at.  So if I decided if I really wanted to
> run the press at that, I could, but sill turn it down for delicate work or
> if I was sick of the racket.
>
>  >...why I'm using the C P
>  >pump.The flow is full volume until you reach the maximum pressure.
>
> Do you know what ram speed full volume gives you?
>
> Hope you health is coming back well for you.
>
> Ed
>
>
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