[TheForge] Hydraulic Press Control

Sun Feb 3 23:54:10 2002

Hey Ed,
Just about any switch that will handle the amps, have a spring return to
neutral. and be moisture and dust resistant should work.
Chuck
----- Original Message -----
From: Ed Fasula <[email protected]>
To: <[email protected]>
Sent: Sunday, February 03, 2002 10:00 PM
Subject: Re: [TheForge] Hydraulic Press Control


> Hi Chuck,
> Good to hear the foot switch works well you, I was hoping it would work
out
> ok when I bought the solenoid valve.  I don't know what you mean by micro
> switch.  I was thinking of using a couple foot switches or making my own
> 2-way rocker switch.  I figured that a pedal like on a Bobcat skid steer
> would be good.  I was thinking of using a steel plate with contacts in
> front and back.  Rock forward to press, back to lift.  That way, you could
> put your weight on the switch and stand still while working.
>
> How about a helmet with a mercury switch, look down to press, up to
> lift.  Crazy but would be cool.
>
> Keith used the rapid cycle to work a bowl cold.
>
> Ed
>
> At 01:51 PM 2/3/02 -0600, you wrote:
> >Hey Ed,
> >I haven't received the  UMBA tape yet, so I'm not clear as to the
advantage
> >of using an automatic repeat cycle on a hydraulic press. The press works
so
> >much more slowly than a power hammer so that you loose heat to the dies
very
> >rapidly.
> >  I would suspect that Keith uses adjustable limit switches to cycle the
> >cylinder.
> >  A friend of mine, who used to work at Vickers while in grad school, at
one
> >time told me about an idea he had to build a press with a 12" cylinder.
It
> >would be powered by a large gpm pump and a regenerative valve that cycles
> >the cylinder return flow directly back into the inflow side. He said that
> >the cycle timing could approximate the bpm of a power hammer. At those
> >speeds the billet would stay hot much longer.
> >  I have used both manual and solenoid control valves and I believe foot
> >controlled micro switches controlling the flow direction of a remote
> >solenoid valve located on your power pack are the way to go.
> >----- Original Message -----
> >From: Ed Fasula <[email protected]>
> >To: <[email protected]>
> >Sent: Sunday, February 03, 2002 11:01 AM
> >Subject: [TheForge] Hydraulic Press Control
> >
> >
> > > We had a thread going here about building a hydraulic press.  I'm
getting
> > > materials together to build it, but I also want to use electronic
> > > controls.  In the UMBA tape mentioned Keith Johnson demonstrates an
> > > automatic control setup to repeatedly stroke the cylinder.
> > >
> > > To set the force, I think Keith used an adjustable pressure relief
> > > valve.  He didn't detail how he controlled the repeat cycle.  I would
> >guess
> > > that he had a flow sensor on the relief valve outlet which worked with
a
> > > solenoid valve and an adjustable timer.
> > >
> > > I was thinking that the same could be achieved with a pressure sensor
> > > replacing the relief valve and flow sensor.
> > >
> > > Also, I don't know why he doesn't use an electric switch to control
his
> > > solenoid valve when in manual mode instead of the mechanical valver.
> > >
> > > Has anyone got advice on how to do this and where to get the stuff?  I
> >have
> > > a spring center open solenoid valve already.
> > >
> > > Thanks,
> > > Ed
> > >
> > >
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