[TheForge] Cylinder Size

Mon Jul 14 00:33:00 2003

Just a thought I had if I ever got around to building an air hammer. I
thought I would control the position of the lower pilot valve w/ the
treadle, after the throttle valve was wide open further depressing the
treadle would move the pilot valve downward.
Randy Mundt
----- Original Message -----
From: "Chuck Robinson" <[email protected]>
To: <[email protected]>
Sent: Sunday, July 13, 2003 4:20 PM
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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