[TheForge] Hydraulic Press Control

Sun Feb 3 22:58:11 2002

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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