[TheForge] 15Ton Press
Ed Fasula
[email protected]
Sat Jan 5 18:09:01 2002
Hi Steve,
I'm thinking that I'd like the variable speed so that I can double speed
the motor for splitting wood or if I want to go quicker. Thanks tho.
Ed
At 10:16 AM 1/5/02 -0700, you wrote:
>Ed, making a phase converter is a whole lot cheaper than buying a vfd if:
>-you don't need variable speed
>-you are comfortable with your skills wiring 220V electricity
>-you are a good scrounge
>
>Let me know if you want more details.
>
>Steve Smith
>
>Ed Fasula wrote:
>
> > Hi Chuck,
> > I really like how you have the cylinder low but still have the top anvil
> > the mover. The angle of the picture makes it look like you can lift the
> > unit off the wheels before the anvils are within 6" of meeting. Must be
> > the angle. Unfortunately, I can't do this with my cylinder, it's about 32"
> > overall. I think I'm going to do something like the H frame design in the
> > book, but with the cylinder on top. I'll probably have to brace it off the
> > wall to keep it stable.
> >
> > By throat do you mean the opening between the rails? Do you ever wish you
> > had more room between them? I am thinking about 12" but I'm a bit leery.
> >
> > I could get a cylinder that's 8" or 10" diameter. I chose the 6" because I
> > looked at the cost of pump, motor, and a VFD to control the motor and
> > convert single to 3 phase. Everything about doubles and I just felt like
> > 35 tons was an awful lot. But I haven't played with presses before. How
> > limited will I be at if I go with the 6"?
> >
> > I'm not clear how the adjustable pressure dump valve would work. Would I
> > set it to, say 2000 psi and above that it would spill into the
> > reservoir? So it would slow down the ram? Could I stop the ram at a given
> > pressure?
> >
> > Now that I realize that a pilot valve won't work with a 2 stage pump, I'm
> > re-thinking the roller idea. Balancing the rollers and ram off the same
> > system seems like it could be frustrating. I've been looking at using an
> > electric motor with a big reduction in rpm using a gear box and maybe a
> > variable drive shiv.
> >
> > I'm curious, when you use taper dies do you see a lot of force on your
> > lock? I'm not clear if the 3/8" or the 1" dimension is resisting the
> force.
> >
> > Ed
> >
> > At 05:26 PM 1/4/02 -0600, you wrote:
> > >Hey Ed,
> > >I sent you 2 pictures of a hydraulic press based on my window frame "H"
> > >frame design, that Steward Pitrie recently built. It has an 8" diameter
> > >cylinder. The press will operate at 70 tons at 3000 PSI, but Steward is
> > >presently running the unit at 2200 PSI, appx. 60 tons.
> > >
> > >It has a 16" throat, the slide rails are 2" square solid stock. The anvil
> > >and top and bottom side plates are 1" x 6" flat bar.
> > >I like the C P Pump because it is easy and precise to adjust the pressure,
> > >But it is much more expensive than the 2 stage gear pumps.
> > >You could probably add an adjustable pressure dump valve to the
> system and
> > >do about as well.
> > >
> > >Remember that if you want to use the press as a rolling mill you will have
> > >to balance both the cylinder and
> > >hydraulic motor pressure/flow requirements with flowvalves to optimize the
> > >system.
> > >
> > >All my dies are welded to 5" x 6" x 3/8" steel plates and the plates slide
> > >into rails welded to the top and bottom sides of the die bases on the
> press.
> > >There is a stop pin welded to the back side of the die bases to
> register the
> > >dies when you slide them into place.I lock my dies in position with a
> > >butterfly clip which is a 3/8" x 4" x 1" piece of bar stock with a 3/8"
> > >hole drilled centerline. This is bolted to the die bases so that the piece
> > >can be rotated horizontally to remove, or vertically to lock the dies in
> > >position. A 1/2 turn of the bolt locks or loosens the lock. I found that I
> > >don't need to use the lock except when I am using taper dies.
> > >
> > >For a simple stock shear I use a flat bottom die and a piece of small
> > >railroad rai lweb ( cut the top of the rail off , square off the cut
> surface
> > >and then weld the rail base to your die plate). It would be better to make
> > >the blade section from H-13 to minimize heat deformation of the blade.
> > >
> > >One of these days I hope to get a digital camera to make this easier to
> > >understand.
> > >Chuck
> > >----- Original Message -----
> > >From: Ed Fasula <[email protected]>
> > >To: TheForge <[email protected]>
> > >Sent: Thursday, January 03, 2002 9:29 PM
> > >Subject: Re: [TheForge] 15Ton Press
> > >
> > >
> > > > Hi Chuck & Ralph,
> > > >
> > > > I'm really interested in your ideas about using rollers. I'm
> designing my
> > > > press and I'd like to keep this future design in mind. I haven't
> bought a
> > > > pump yet - the compensated piston pump sounds interesting - do you
> > > > basically set it at a given pressure? Is it just one speed
> then? I was
> > > > planning on a Northern Hydraulics 2 speed gear pump, which wouldn't
> stop
> > >at
> > > > a pressure but my piston has a valve to lock it until forced to move -
> > >it's
> > > > off a construction fork lift. So I could set it to a stock thickness.
> > >Any
> > > > idea on the power required to drive the roller?
> > > >
> > > > Chuck, I'm really interested in seeing the structure for a 70 ton
> > > > press! How wide is your span? The book has a 10" opening. I'd
> like to
> > >go
> > > > at least 12". Have you ever wished to have it wider? What is your die
> > > > setup that you can change in 15 seconds? I was thinking of using 3x3
> > > > vertical bar and then plasma cutting blanks that I'd press around
> the 3x3
> > > > bar (into a female die), that would form a box with one open end, then
> > >have
> > > > a hitch pin with a ball retainer to run horizontally through the
> 3x3 bar.
> > > >
> > > > Have you guys ever thought about making a hot shear with the press?
> > > >
> > > > Can you pass along some pictures? Please use [email protected]
> > > >
> > > > Ed
> > > >
> > > >
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