[TheForge] Krause/Nazel type air hammer

Fri Dec 6 21:04:01 2002

That's easier than what I was considering. I figured you would need a 
gibbed slide for the power cylinder, just like the ram.

Steve

Darrell wrote:
> 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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>>>
>>>
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>>>
>>
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>>theforge mail list group photo site is
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>>
> 
> 
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