[TheForge] Cylinder Size

Sun Jul 13 23:24:01 2003

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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