[TheForge] Krause/Nazel type air hammer

Sat Dec 14 08:42:01 2002

Yes, this sounds like reasonable overkill.

When I was drilling I built quite a number of hydraulic tools and devices. I
always oversized everything I could except: pumps, motors and rams. They
must be properly matched for proper performance. Oversizing: hoses,
fittings, valves, etc, made for much cooler running equipment. I have to
assume the same is true for air powered equipment.

I'll have to look through the drawings, pics and whatever other info I can
find before I can develop an opinion on spool valves. I haven't looked at
the JPGs you just posted long enough to puzzle out yet. I'm bookmarking the
URL Steve H. posted as well. It's my bed time and they'll have to wait till
my next weekend. I hate graveyard shift. <sigh>

Thanks, I love brainstorming this kind of stuff.

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

----- Original Message -----
From: "Steve Smith" <[email protected]>
To: <[email protected]>
Sent: Friday, December 13, 2002 3:27 PM
Subject: Re: [TheForge] Krause/Nazel type air hammer

> I'm thinking that high volume in this case means a valve with at least
> the cross section of the smallest restriction in the system (well, maybe
> twice that). If I have half inch ports on my cylinders, there isn't much
> benefit to making the valve flow cross section much bigger than 1".
> Sound like the right idea?
>
> I think spool valves come up in the context of people wanting an option
> to machining their own (i.e. something they can buy).
>
> Steve Smith
>
> Jerry Frost wrote:
> > A number of years ago I did the same thing but didn't have anybody to
bounce
> > it off. And I couldn't find anybody willing to let me take their's
apart.
> > <sigh>
> >
> > In principle it's dirt simple; a pair of synchronized high volume
valves.
> > What I couldn't resolve to my satisfaction was the travel distance of
the
> > ram cylinder. All I came up with was a pressure bypass to the return
side.
> > Like I say, unsatisfactory. (I think)
> >
> > Mike's pics of his Onions and Alldays valves didn't tell me how it works
but
> > did verify my thoughts on valve type. Almost any type of high volume
valve
> > should work fine, the simpler the better.
> >
> > If I can figure out the porting, etc. I'd be tempted to use the simplest
> > valves possible, either flap, reed or piston port. My question at this
point
> > is: Why spool valves? Or are they only on the control/primary circuit
with
> > another set of valves handling the direct air from/to the rams?
> >
> > Frosty
> > ------------------------
> > If it ain't forged
> > it ain't real.
> > Wrought iron is.
> > The FrostWorks
> >
> > Meadow Lakes, AK.
> >
> >
> > ----- Original Message -----
> > From: "Shannell Sugrue" <[email protected]>
> > To: <[email protected]>
> > Sent: Thursday, December 12, 2002 10:47 PM
> > Subject: Re: [TheForge] Krause/Nazel type air hammer
> >
> >
> >
> >>Yeah me too, I drew up an idea I had on how it worked, ran it by an
> >
> > engineer
> >
> >>friend of mine and he had some suggestions but said it looked good,
seemed
> >>too simple though, but Ive never seen how this "krause" type valve works
> >
> > and
> >
> >>it seems pointless reinventing the wheel.
> >>
> >
> >
> >
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> >
> >
> >
>
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