[TheForge] 15Ton Press

Sat Jan 5 23:30:02 2002

If you double the speed, you also double the HP required out of the motor. I don't
know if this is a wise idea.

Steve

Ed Fasula wrote:

> 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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