Nothing in that article is new other than possibly the use of a PLC for
that kind of control without the use of a specific card designed for
hydraulic control. Most PLC Hydraulic Servo controls setups require a
special hardware card to do what they are doing.. and usually it is
very expensiv
On 27 September 2013 03:04, Dave Cole wrote:
> http://en.revija-ventil.si/data/strokovni-clanki/17-2011-4/situm.pdf
They seem to be rather re-inventing the wheel.
Servo-hydraulic tension-compression fatigue testing machines are all
like that, and have been running closed-loop in force or displac
Stuart,
I was looking for something else entirely on the web and ran into this
by accident. This is very close to what you want to do.
http://en.revija-ventil.si/data/strokovni-clanki/17-2011-4/situm.pdf
I use a lot of S7-1200 PLCs but I think that all of this could be done
with LinuxCNC.
Ba
On 09/23/2013 06:01 AM, andy pugh wrote:
> On 23 September 2013 03:50, Stuart Stevenson wrote:
>> Gentlemen,
>>I want to control a hydraulic cylinder (extension and retraction) with
>> LinuxCNC.
>> I want to use an axial piston swash plate pump.
>> I want to control the swash plate with a serv
>>Why would ram position not be sufficient for air bending?
I think that would work, but I would probably also want to know cylinder
pressure so I could set tonnage limits in an attempt to prevent breakage if
something goes wrong.
Decent pressure sensors are 2-$300 each. Cheap insurance compar
air bending mostly
Why would ram position not be sufficient for air bending?
Would tonnage be more important when coining?
I want to control both sides so I have the option of easily bending one end
more than the other.
On Mon, Sep 23, 2013 at 4:32 PM, Dave Cole wrote:
> I just did the controls
On Mon, 9/23/13, andy pugh wrote:
Subject: Re: [Emc-users] hydraulic servo system
To: "Enhanced Machine Controller (EMC)"
Date: Monday, September 23, 2013, 9:53 AM
On 23 September 2013 15:24, Dave Cole
wrote:
> I'd keep an eye on Ebay for servo
valves. Most peop
I just did the controls for a hydraulic press - a new machine that
swages 6 stainless steel anchors about 3/4" diameter at the same time.
It has an 8" cylinder on it and they are running about 2800 PSI system
pressure.
The press is quick as there is a 25 hp motor on it with a 10 gallon
accumu
On Sep 23, 2013 3:11 PM, "andy pugh" wrote:
>
> On 23 September 2013 20:50, Stuart Stevenson wrote:
> > 2 cylinders - one on each end
> > 500 ton 20' brake press
> > I need to control each end separately.
>
> I have a feeling that I have seen the machine?
Your feeling would be correct.
>
> The 2
On 23 September 2013 20:50, Stuart Stevenson wrote:
> 2 cylinders - one on each end
> 500 ton 20' brake press
> I need to control each end separately.
I have a feeling that I have seen the machine?
The 20 ton testing machine I ran could do 36 inches per second running
with a Moog valve. Given th
pic here - http://imagebin.org/271728
On Mon, Sep 23, 2013 at 2:50 PM, Stuart Stevenson wrote:
> 2 cylinders - one on each end
> 500 ton 20' brake press
> I need to control each end separately.
>
>
>
> On Mon, Sep 23, 2013 at 2:32 PM, dave wrote:
>
>> On Mon, 2013-09-23 at 13:57 -0500, Stuart
2 cylinders - one on each end
500 ton 20' brake press
I need to control each end separately.
On Mon, Sep 23, 2013 at 2:32 PM, dave wrote:
> On Mon, 2013-09-23 at 13:57 -0500, Stuart Stevenson wrote:
> > The cylinders I want to control are 14 inch OD which I think would have
> > 13.5 piston.
>
On Mon, 2013-09-23 at 13:57 -0500, Stuart Stevenson wrote:
> The cylinders I want to control are 14 inch OD which I think would have
> 13.5 piston.
> 24 inch minimum stroke (maybe a little more)
> 1 1/2 pipe input on the rod side of the piston
> 2 inch pipe on the other side
> I need it to extend o
On 23 September 2013 15:24, Dave Cole wrote:
> I'd keep an eye on Ebay for servo valves. Most people don't know what
> to do with them.
http://www.ebay.com/itm/Actuator-hydraulic-flight-simulator-48-stroke-with-Moog-72-315-/15024528
All set up and ready to go. (and he has 4 of them)
--
The cylinders I want to control are 14 inch OD which I think would have
13.5 piston.
24 inch minimum stroke (maybe a little more)
1 1/2 pipe input on the rod side of the piston
2 inch pipe on the other side
I need it to extend out in about 10 seconds.
the leverage is 5 to 1 - 70/14 measured with
I agree with Andy. I do quite a few industrial control jobs using
hydraulic servos.The normal setup is a swash plate pump that is self
pressure regulated feeding an accumulator (for pump efficiency and fast
response) and that feeds a
4 way servo valve or servo grade proportional valve. Th
On Sun, Sep 22, 2013 at 10:50 PM, Stuart Stevenson wrote:
> Gentlemen,
> I want to control a hydraulic cylinder (extension and retraction) with
> LinuxCNC.
> I want to use an axial piston swash plate pump.
> I want to control the swash plate with a servo motor.
This method has been used, albeit
On 23 September 2013 03:50, Stuart Stevenson wrote:
> Gentlemen,
> I want to control a hydraulic cylinder (extension and retraction) with
> LinuxCNC.
> I want to use an axial piston swash plate pump.
> I want to control the swash plate with a servo motor.
This ought to work, but it isn't the us
On Sun, 9/22/13, Stuart Stevenson wrote:
Gentlemen,
I want to control a hydraulic cylinder (extension and
retraction) with
LinuxCNC.
I want to use an axial piston swash plate pump.
I want to control the swash plate with a servo motor.
I will install a linear scale for position feedback.
Stuart Stevenson wrote:
> Gentlemen,
> I want to control a hydraulic cylinder (extension and retraction) with
> LinuxCNC.
> I want to use an axial piston swash plate pump.
> I want to control the swash plate with a servo motor.
>
The null position on the pump may not be completely repeatable.
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