[TheForge] Cylinder Size

Sun Jul 13 18:27:00 2003

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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