[TheForge] 15Ton Press
Ed Fasula
[email protected]
Sat Jan 5 09:50:01 2002
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
> >
> >
> > _________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at http://mail.yahoo.com
> >
> > _______________________________________________
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://albums.photopoint.com/j/AlbumList?u=1169182
> > ___________
> >
> >
>
>
>_______________________________________________
>http://mailman.qth.net/mailman/listinfo/theforge
>theforge mail list group photo site is
>http://albums.photopoint.com/j/AlbumList?u=1169182
>___________
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com