[TheForge] 15Ton Press

Sat Jan 5 12:54:34 2002

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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