[TheForge] Krause/Nazel type air hammer

Wed Dec 4 02:38:00 2002

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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