[TheForge] Krause/Nazel type air hammer

[Jeff Harding]

Steve;

   I haven't seen the plans for the valve, so I'm shooting in the
dark, BUT, a brake master cylinder certainly produces higher pressures
than this using "rubber" cups.   Of course they are Buna N or neoprene
or something better than rubber but they hold up under a lot of
pressure in a medium that does not compress.  Seems like the same set
up if kept properly oiled would work,  pressure on the back side of
the cup would bleed through.       I think... Anyone?

      Jeff   ><>


> 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?