[TheForge] hydraulics

Wed Apr 16 00:03:00 2003

Hey Ed,
My press uprights will be 4"x1 1/2" inch bar stock so  when the 1"x 6" cross
plates are welded on either side of the uprights there will be a 4" gap
between them. When I make my dies for drifting and punching the receiving
die will be on the top cross plates to take advantage of the open space to
pass the drift through.
You want to use as long a ram stroke as you can to permit working on large
work stock and specialty die plates.
If you are having the cylinder custom made recommend about a 14" stroke.
Make sure that the cylinder head and rod connection ends use attaching
fittings that minimize the length need to connect to the press.
Also I like to build in a little slop in the attaching fittings  to minimize
side loading on the ram seals when forging off center.
 For what it's worth an old time hydraulics guy told me that if you use
identical cylinders,fittings and plumbing lengths and sizes the rams
shouldn't need a flow divider.
Chuck

----- Original Message -----
From: "Ed F" <[email protected]>
To: <[email protected]>
Sent: Tuesday, April 15, 2003 9:24 PM
Subject: Re: [TheForge] hydraulics

> Hi Chuck,
>
> I just checked into a rotary flow splitter - guy at the hydraulic shop
says
> they will start at about $500.  Wheew, I think I'll look at doing it with
> one again.  The inverted style or whatever you call it with the cylinder
> below the work-surface pulling on tension bars may work ok for punching if
> the top of the cylinder is put on blocks to allow for a horizontal hole to
> push the slug out with.  The blocks would eat up clearance to the floor
but
> I was thinking of spacing the low cross-member pieces out so that they can
> clear the outside of the barrel.  Ya know what I'm sayin?
>
> Ed
>
>
> ----- Original Message -----
> From: "chuck schaeffer" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, March 20, 2003 12:11 PM
> Subject: [TheForge] hydraulics
>
>
> > To everyone interested in Hydraulics,
> >
> > Something I picked up from the Batson plans was looking at what the end
> product is going to be.  Buying a piece here and there makes it  very
> difficult to gain compatibility with all of the parts.  I buy all new
parts
> due to having been burned on used stuff a couple of times.  This also
allows
> you to match the parts to give you a better system.  Having your plan in
> mind you can pick up pieces as the funds are available.
> >
> > I buy quite a few things from the farm stores around here.  Their prices
> are good and have it in stock or will order it for you.
> >
> > Marathon motors make single phase motors up and including 10 hp.
> www.marathonelectric.com
> > The prices they list are considerably higher than what I pay around
here.
> >
> > To hook two cylinders in parallel you will need to place a divider in
the
> power side coming from the pump or it could be placed in the return side.
A
> rotary divider will give you the best results.  There are other types out
> there that use slides to control the flow.  Be sure that they are 50:50
> divider with balancing at one end or the other.
> >
> > I agree with Ralph about using the pumps at lower speed and half volume.
> Not only quieter but will give you much better pump life.
> >
> > Anyone using electric control valves, check for pressure relief.  Those
I
> have used required an external pressure relief.
> >
> > Sorry I got a little wordy with this.
> >
> > Chuck
> >
> > Chuck Schaeffer
> > Metals Magic Shop
> > [email protected]
> > Ph. 608.798.4296
> > Fax 608.798.1940
> >
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