[TheForge] Cylinder Size

Sun Jul 13 19:35:00 2003

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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