Pneumatic Control

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Subject Author Date
Pneumatic Control Andrew Mawson 10-12-2006
Posted by Andrew Mawson on October 12, 2006, 5:56 pm
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> My apologies for the language, and I'm not having a go at you
Andrew, but
> you brought back some very unpleasant memories and I wouldn't want
anyone to
> suffer like that, or worse.
>>SNIP<<

.
>
> Greg

Greg,

You seem very skilled in assuming that you are the font of all
knowledge regarding safety on this group, and that everybody else has
no apptitude / skill / experience / or common sense. Many is the time
I have bitten my tongue and refrained from replying to some of your
irritating posts, as I have no wish for a flame war, but really at
times you demonstrate a very annoying trait.

That said, as one who has lost an eye in an accident at the age of
five, I sympathise with your aluminium accident.

AWEM



Posted by Greg on October 12, 2006, 6:13 pm
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> You seem very skilled in assuming that you are the font of all
> knowledge regarding safety on this group, and that everybody else has
> no apptitude / skill / experience / or common sense.

I'm sorry Andrew but the very fact that you were operating with water
dripping into the melt means you were not taking safety seriously enough.
But hey, if you don't want to hear from someone who's been put in hospital
from the same mistake then that's up to you, it's your life. So flame away
to cover your mistake, I'm not bothered and won't waste my time answering
you. But what you WON'T do is stop me from trying to help others who may not
have realised how dangerous it was, you're not the only person in the world
working with molten metal you know.

Greg



Posted by Wayne Weedon on October 12, 2006, 1:41 pm
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Andrew Mawson wrote:
> I am rebuilding a tilting 'furnace body' ie an induction furnace coil
> unit with crucible mounted in it so it tips just over 90 degrees to
> pour the molten metal. Tilting is by a pair of double acting pneumatic
> cylinders acting in parallel, with the air controlled by a single
> spool valve lever up/off /down thingy. This beast has been out in the
> open for too long and the bearings and pivots took quite some freeing
> to get the rust out. Now it 'sort off works' but the control is far
> too crude. Raising to tilt is ok'ish but the down stroke wacks it down
> far too roughly. Somehow I need to set the air flow rate so things are
> a little more gentle and controlled. Is it just a case of throttling
> the air with a valve, or is there an analogue version of the spool
> valve rather than the digital on/off type that is fitted?

Exactly the reason they used Hydrocheck circuits on the old pegboard
machines to control feedrates.

Air just cannot be made to behave properly, if you want smooth motion.

Could you arrange another cylinder in parallel but use oil rather than
air and a flow control valve to adjust resistance. The Air circuit will
then work against the hydraulic circuit.

Wayne....

Posted by Peter Neill on October 13, 2006, 2:58 am
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On Thu, 12 Oct 2006 17:30:54 +0100, "Andrew Mawson"

> Somehow I need to set the air flow rate so things are
>a little more gentle and controlled. Is it just a case of throttling
>the air with a valve, or is there an analogue version of the spool
>valve rather than the digital on/off type that is fitted?
>
>AWEM
>

Andrew, if it would help you I have 2 sets of pneumatic catalogues
from both Festo and SMC. Both are pretty big at 3 volumes each and you
would be welcome to borrow these if it would help.

I'm going to the Midlands exhibition on Saturday and could bring them
up in the car if there is anyone who could collect them from me to
pass on to you.

I don't need them for a while so no rush to get them back.

Peter

Posted by Andrew Mawson on October 13, 2006, 5:39 am
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> On Thu, 12 Oct 2006 17:30:54 +0100, "Andrew Mawson"
>
> > Somehow I need to set the air flow rate so things are
> >a little more gentle and controlled. Is it just a case of
throttling
> >the air with a valve, or is there an analogue version of the spool
> >valve rather than the digital on/off type that is fitted?
> >
> >AWEM
> >
>
> Andrew, if it would help you I have 2 sets of pneumatic catalogues
> from both Festo and SMC. Both are pretty big at 3 volumes each and
you
> would be welcome to borrow these if it would help.
>
> I'm going to the Midlands exhibition on Saturday and could bring
them
> up in the car if there is anyone who could collect them from me to
> pass on to you.
>
> I don't need them for a while so no rush to get them back.
>
> Peter

Peter,

Very kind of you but I am unable to get to the Midlands this year -
running a Polly course at SM&EE but thank you for your very kind
offer.

AWEM



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