[TheForge] Krause/Nazel type air hammer

Wed Dec 4 23:10:01 2002

Darrell,
Thanks for the tip.
Bob
----- Original Message -----
From: "Darrell" <[email protected]>
To: <[email protected]>
Sent: Wednesday, December 04, 2002 1:35 AM
Subject: Re: [TheForge] Krause/Nazel type air hammer


> I think John Larson solved the con rod problem. If I understand what he is
> saying, his power cylinder is mounted on a swivel at the top and the
piston
> rod is connected to the crank so the cylinder swings back and forth
> following the crank.
>
> Darrell
>
> ----- Original Message -----
> From: "Bob Smolen" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, December 03, 2002 8:18 PM
> Subject: Re: [TheForge] Krause/Nazel type air hammer
>
>
> > I concur with Bob Schade's comments. I did not see Mark's hammer operate
> so
> > if you have, please comment on the crank and connecting rod in terms of
> > noise and vibration.
> > The valve is important , but the mechanical power transmission to the
work
> > cylinder may be the achilles heal for the home built model.I hope not,
but
> I
> > hope to find out soon.
> > Bob
> >
> > ----- Original Message -----
> > From: <[email protected]>
> > To: <[email protected]>
> > Sent: Tuesday, December 03, 2002 11:12 AM
> > Subject: RE: [TheForge] Krause/Nazel type air hammer
> >
> >
> > > andy,
> > >
> > > i thought of that too. in fact i bought 2 three way ball valves from
> > mcmaster carr. i still think it might work but i was dissuaded by
someone.
> > the problem (they said) was that the valves don't open progressively.
that
> > is because the opening in the valve isn't a straight sided opening like
a
> > square or rectangle. it starts opening with just a little crescent and
> then
> > goes from there. you can visualize better than i can describe (i hope).
> > >
> > > i think a better and just as easy solution would be to make (as mark
> > describes in his booklet) two three way spool valves. i think it's
doable
> by
> > most.
> > >
> > > just drill the hole undersize, ream about .0005 undersize, then lap
your
> > spool to a nice fit. go to your engine rebuild/hot rod shop for help on
> > lapping as they do it all the time (or used to) when lapping valves.
mark
> > shows the spools being made by filing or grinding (bench grinder) the
> > openings in them.
> > >
> > > this is all a moot point as far as i'm concerned so whether it could
be
> > done or not is still debatable. i am a machinist but if you're not and
you
> > need machining done there are guys out there that will do it by the
hour.
> > >
> > > what turned (!) me off to the whole krausehammer project was this.
marks
> > hammer hits 305 beats per minute. light blows are 305 bpm, hard blows
are
> > 305 bpm. this means that the double ended (pump) cylinder is stroking at
> 305
> > strokes per minute. as bob smolen mentioned earier the pump cylinder is
> > connected to a crank. the connecting rod would be 3" long (the longer
the
> > better in order to lessen the side load on the pump cylinder) and going
> > around at 305 rpm.
> > >
> > > when i work on a project that will need some power hammer work i turn
on
> > my 25 LG and just leave it run. all day, a few hours, whatever the
project
> > needs. the whole time it's running it's a 1horse motor just sitting
there
> > idling. no long shaft moving at 305 rpm. when i need power i step on the
> > treadle and use it.
> > >
> > > with the krausehammer would you leave it idle and have all the
hardware
> > (connecting rod/pump cylinder) stroking away? maybe so. i think mark
> > mentioned once in an email that he turns his on and off.
> > >
> > > in the end it seemed like i would end up with a hammer (if it worked)
> that
> > maybe had better control but also had a downside (to me). it just didn't
> > seem worth all the trouble to me. why not buy an aircompressor that is
> made
> > to pump air and build a kinyon?
> > >
> > > having said all that if bob smolen or you or ? get one working and it
> > works good i'd be the first in line.
> > >
> > > i'll shut up now.
> > >
> > > bob
> > > ______
> > >
> > > >I decided not to build one of these because of how much time I don't
> > have,
> > > >but after gazing at Mark's book and my sketch pad for hours, I
> concluded
> > > >that the job could be done by a linkage that activates two ball
valves.
> > One
> > > >opens as the other closes.
> > > >Times two, of course, for upper and lower air passages.
> > > >Get the proportions of the levers right for the treadle travel, and
> > you've
> > > >got it with components you can buy at Ace Hardware.
> > > >Simple, huh?
> > > >Not as cute as Mark's, but it would work.
> > > >
> > > >Andy G.
> > > >
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