[TheForge] Cylinder Size

Sun Jul 13 22:22:01 2003

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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