[TheForge] Krause/Nazel type air hammer

Sat Dec 7 23:17:01 2002

The pressure is held in the brake cylinders by the little pistons, the 
rubber parts are to keep out the dust.
L Brown

At 10:50 AM 12/7/2002 -0500, you wrote:
>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?
>
>
>_______________________________________________
>http://mailman.qth.net/mailman/listinfo/theforge
>theforge mail list group photo site is
>http://www.photoaccess.com
>Login:  [email protected]
>password:  anvil
>___________