[TheForge] Krause/Nazel type air hammer

[Steve Smith]

Thanks!
Steve

geoff_m@bigfoot.com wrote:
> 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 
>>the gaps with grease? I think the pressure is only around 50 psi. 
>>Inelegant, but it should work fine.
>>As an alternate idea, how about plastic seals? Can you use a plastic 
>>that gives a bit and bore the plastic out a little undersize, then push 
>>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
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