[TheForge] Krause/Nazel type air hammer

[theforge@mailman.qth.net]

On Sat, 07 Dec 2002 08:51:53 -0700, you wrote:

>Here are a couple of ideas aimed at minimizing or eliminating machining:
>
>Treadle Valve
>This seems like the hardest part to most of us.
>Why not make the fit a tiny bit less exact (maybe to 0.001") and fill=20
>the gaps with grease? I think the pressure is only around 50 psi.=20
>Inelegant, but it should work fine.
>As an alternate idea, how about plastic seals? Can you use a plastic=20
>that gives a bit and bore the plastic out a little undersize, then push=20
>the valve center into it?

 A friend has a 100lb Spanish air hammer, and th evalve is very simple
- pasically a machined cylinder in the casting, with a poppet valves
and cutaways. The rear cyl is ~6" diam and the hammer cyl is ~4.5"
diam. The air pressure (measured witha guage on the top of the pump
cyl) is 15psi. Hope this helps
Geoff