[TheForge] Krause/Nazel type air hammer

Sat Dec 14 13:09:01 2002

Mark Krause left the "clamp" ports out of his valve for the home made
hammer. That made his drawings much simpler.

Darrell

http://www.machinemaster.com

----- Original Message -----
From: "Jerry Frost" <[email protected]>
To: <[email protected]>
Sent: Saturday, December 14, 2002 5:27 AM
Subject: Re: [TheForge] Krause/Nazel type air hammer

> 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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