[TheForge] Cylinder Size

Mon Jul 14 13:05:01 2003

The picture site pics are hard to identify. The one I assumed was yours has
a red fairing around the hammer head.
Would appreciate it if you could email the pics directly to me.
Chuck
----- Original Message -----
From: "Shannell Sugrue" <[email protected]>
To: <[email protected]>
Sent: Sunday, July 13, 2003 10:14 PM
Subject: Re: [TheForge] Cylinder Size


> Is there a photo of my hammer on the photo site cause I cant find it, its
> not in the tools or hammers folders. Not sure if you are seeing my hammer.
>
> ----- Original Message -----
> From: "Chuck Robinson" <[email protected]>
> To: <[email protected]>
> Sent: 14 July, 2003 11:42 AM
> Subject: Re: [TheForge] Cylinder Size
>
>
> > I see how you actuate the top pilot valve, but don't see the bottom one.
> > Chuck
> > ----- Original Message -----
> > From: "Shannell Sugrue" <[email protected]>
> > To: <[email protected]>
> > Sent: Sunday, July 13, 2003 6:25 PM
> > Subject: Re: [TheForge] Cylinder Size
> >
> >
> > > Ive reread your post and realise I misunderstood what you meant by a
> > > completion sensor. In my opinion that will slow your hammer down
> > > considerably, if the hammer has to wait before the piston stops moving
> > > before the air reverses and pushes the cyl back up you will loose many
> > > millisecs, having the hammer reverse before it hits keeps the speed up
> and
> > > has little impact on the force of the blow, a double pilot valve is
the
> > only
> > > way to go in my opinion and allows all sorts of setup combos, along
with
> > an
> > > air pressure reg for the top port (another very highly reccommended
mod)
> > > which I have plumbed in with a 3 way valve so I can bypass it at the
> flick
> > > of the valve handle and get full pressure blows.
> > > Quote
> > > "The only problem I fore see with this design, is where to mount the
> > > adjustable bottom pilot valve, hence the desirability of using a
> pneumatic
> > > stroke completion sensor."
> > > Take a look at mine, another way would be to have the rollers on the
> > inside
> > > of the outer tube or even sticking into a slit in the outer tube with
a
> > ramp
> > > at top and bottom of the ram.
> > >
> > > ----- Original Message -----
> > > From: "Chuck Robinson" <[email protected]>
> > > To: <[email protected]>
> > > Sent: 14 July, 2003 7:50 AM
> > > Subject: Re: [TheForge] Cylinder Size
> > >
> > >
> > > > Hey Shannell,
> > > > I'm slowly building a 200 lb air hammer.
> > > > I don't like the cantilevered hammer slide on the kinyon hammer, so
I
> > > > designed the head to reciprocate inside a vertical square tube
shell.
> > The
> > > > rectangular head has 2 guide grooves milled on opposite sides and
they
> > > slide
> > > > on adjustable steel rails attached to the corresponding inner faces
of
> > the
> > > > tube. The top adjusting bolts of the guide rails will have a small
> hole
> > > > drilled thru the long axis of the bolt to provide lubrication to the
> > > sliding
> > > > surfaces of the hammer head. Since there is no side loading on the
> head
> > > wear
> > > > will be minimal.
> > > > The only problem I fore see with this design, is where to mount the
> > > > adjustable bottom pilot valve, hence the desirability of using a
> > pneumatic
> > > > stroke completion sensor.
> > > > ----- Original Message -----
> > > > From: "Shannell Sugrue" <[email protected]>
> > > > To: <[email protected]>
> > > > Sent: Saturday, July 12, 2003 9:13 AM
> > > > Subject: Re: [TheForge] Cylinder Size
> > > >
> > > >
> > > > > I use the dual pilot setup and its great, hits hard, fast and is
> > easily
> > > > > adjustable on the fly. I think any type of "stroke completion
> sensor"
> > > > might
> > > > > be overkill, I often slide my roller valves when working or when
> > putting
> > > a
> > > > > piece under the hammer.
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Chuck Robinson" <[email protected]>
> > > > > To: <[email protected]>
> > > > > Sent: 12 July, 2003 9:13 AM
> > > > > Subject: Re: [TheForge] Cylinder Size
> > > > >
> > > > >
> > > > > > One of the problems I've noticed is the relatively soft hit if
the
> > > > Kinyon
> > > > > > style hammers.
> > > > > >  I suspect the automatic reversing switch in the single pilot
> > control
> > > is
> > > > > > valve is the culprit, since the piston switches direction before
> the
> > > > > hammer
> > > > > > hits the billet. This also reduces dwell time of the hammer on
the
> > > > billet.
> > > > > > A double pilot control valve will eliminate this problem but the
> > > bottom
> > > > > > pilot valve must be adjusted for the billet thickness.
> > > > > > Is there any brave soul out there who has played around with
> stroke
> > > > > > completion sensors to maximize hammer dwell time and
automatically
> > > > adjust
> > > > > > for stock thickness?
> > > > > > Chuck
> > > > > > ----- Original Message -----
> > > > > > From: <[email protected]>
> > > > > > To: <[email protected]>
> > > > > > Sent: Friday, July 11, 2003 2:13 PM
> > > > > > Subject: Re: [TheForge] Cylinder Size
> > > > > >
> > > > > >
> > > > > > > If you go with a larger bore on the cylinder you would need to
> > also
> > > > have
> > > > > > the ports on the cylinder and and the valve be as large as
> > > possible.The
> > > > > > trick is the amount of air flow you can get through the system
as
> > fast
> > > > as
> > > > > > you can get.You can have a large bore cylinder with big ports
but
> if
> > > the
> > > > > > valve ports are small and have a low cv rating then it will not
> > cycle
> > > > that
> > > > > > fast.I have a 2" bore cylinder on my 25lbr with 3/8" ports on
both
> > the
> > > > > > valve(which also has a high cv rate)and cylinder.it will do 240
> > beats
> > > > > > /minute before that I had the same style valve with 1/4" ports
and
> a
> > > > lower
> > > > > > cv and could only get 180 beats/minute
> > > > > > >
> > > > > > > --
> > > > > > > Bob
> > > > > > > HotAnvil Forge
> > > > > > > http://members.tripod.com/hotanvil_forge
> > > > > > >
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