[TheForge] FAQ

[Jerry Frost]

Hmmmm. Guess I'll have to be more contentious next time. <sigh>

I'm not bored with burners, I just hit on a combo that works more than well 
enough for my purposes. Of course, I've never built two the same and I don't 
have a decent place to work yet. Most importantly I didn't write a book. 
<grin>

I adopted the term "gun" for blower driven burners from furnace and navy 
boiler room guys.

For your first talking point, parts A-C. If you're over working yourself 
doing finish work on the anvil, you need more practice doing the rough work. 
A little more rebound or how to get it ain't going to do you any good.

Re: D. Neither. No. Go sift clinker.

I love scrolls, hate bender turned scrolls and can turn one by hand about as 
fast as the machine can. One thing wrong with the benders is the dies 
usually suck. Of course the biggest sin of bender turned scrolls is the 
result of the fabricator NOT finishing the job.

Self contained power hammers is always a good topic but I think I've done 
about all I can without putting metal together and giving it a try.

Frosty
-------------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

http://www.artmetalradio.com/

From: "Mike Porter" <michael.a.porter at comcast.net>


> Jerry,
> I don't think a full blown debate about tooling is possible, as we are 
> both
> pretty ruthless on the subject. "It is what it is" isn't an attitude that
> allows mental moss to grow thick. The best we can hope for is momentary
> differences of opinion while one of us comes up to speed. It would be
> possible to work up a weak debate about naturally aspirated burners if we
> weren't both pretty bored with the subject.
>
>
> Gun burners, to use your term (where does it come from?) or fan blown (to
> stay on the conservative side until I know your term is better) are of 
> more
> interest to me, equipment wise. Various oxy-fuels and compressed air 
> torches
> are my main interest hand-tool wise.  :)
>
> On the other hand, we could hold a public brainstorming on some piece of
> blacksmith equipment. A new forge design, scroll benders, the theoretical
> limits of anvil design? Here's a question: given that novices don't want 
> to
> make the commitment to a good enough anvil to give proper spring-back, and
> given that it isn't always convenient to use an anvil for everything we 
> wish
> to shape, and given that--at times--a soft support material is an aid 
> during
> finish work, but help (spring-back) is always useful to prevent overwork
> then...
>
> To design a limited application spring system nearly as efficient as a 
> high
> quality anvil, would you:
> (A) Put the spring in the hammer handle (spring handle peening hammers?)
> (B) Put a powerful (ex. coil spring from a car) spring in a support column
> below the soft material
> (C) Do both at different times as appropriate
> (D) Do neither because "everybody knows" that only a high quality anvil is
> any good to a smith. Impudent minds want to know :)
>
> Scroll benders could be fun, but would likely turn into about a year long
> discussion, what with equipment building to prove our points (too much 
> work
> without getting paid for it, or a valuable chance to refine 
> understanding?)
> Are scrolls even worth talking about anymore? I love scrolls but most 
> people
> get hives at the very thought of them after fifty years of cheap junk
> scrolls flooding the market. On the other hand, when I do simple 
> geometrical
> designs people get all excited (where's the justice in such perverse
> reactions? Why ask why? Ah, well. Probably no point in even discussing
> picket twisting. Water-dip painting maybe?
> Mikey
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Jerry Frost
> Sent: Tuesday, April 18, 2006 4:14 PM
> To: Sponsored by ABANA
> Subject: Re: [TheForge] FAQ
>
> Drats! How are we ever going to have a debate?
>
> Diffusers are flame shapers, my old Johnson 133a has them. In the Johnson,
> the A:F mix is manifolded to four burner nozzles near the bottom of the
> firebox. The nozzles are flat rectangular flares that cause the flame to 
> fan
>
> across the bottom of the forge.
>
> With a blower driving the flame you can make the nozzles all kinds of
> shapes. I've seen pics of needle flames, broad short cones and vortices.
> While it isn't impossible to make these things work with naturally 
> aspirated
>
> burners it's trickier. Guns are positive pressure and naturally aspirated
> are negative pressure devices. So, if somebody tells you naturally 
> aspirated
>
> burners suck you can tell them their gun burners blow. <grin>
>
> Pick a simple conical diffuser for instance. This is just an exagerated
> version of the burner flares being used to enhance N/A burners. An
> exagerated cone diffuser will increase the draw of the burner 
> exponentially,
>
> making it harder to get a proper burn. On top of that an increase (flare)
> greater than 1:12 makes turbulence that makes tuning a lot harder.
>
> Most naturally aspirated burners with diffusers are purpose built. A 
> Fisher
> burner being a perfect example. The Fisher burner was designed to make a
> very hot close flame over a wide area. It's tube is tapered over it's 
> entire
>
> length from the throat to a point just below the nozzle where the body
> enlarges well more than the 1:12 ratio. Then it's capped by a perforated
> dome. The flame of a Fisher burner is (as I recall) only about 1/2" high,
> intense blue with little feathering. It spreads across the entire dome in 
> a
> very uniform way.
>
> There's a burner diffuser in use that's been mentioned here a few times in
> conjunction with gun burners. It's a bunch of burner nozzles in an array
> made by drilling or casting a grid of small holes in a block. A burner 
> block
>
> maybe? A:F is fed into the block under pressure and it makes a wide even
> "wall" of flame in the forge.
>
> Anyway, gun burners handle different diffusers better than naturally
> aspirated burners do.
>
> Frosty
> -------------------------------
> If it ain't forged
> it ain't real.
> Wrought iron is.
> The FrostWorks
>
> Meadow Lakes, AK.
>
> http://www.artmetalradio.com/
>
> From: "Mike Porter" <michael.a.porter at comcast.net>
>
>
>> Well, I'm not sure there's anything here to disagree with. When 
>> discussing
>> dragon's breath, I'm referring to the end result exiting the forge. That
>> is
>> not the same as the high velocity flame entering the equipment from a
>> naturally aspirated burner. I like to design forges and furnaces so that
>> that furious little flame is pretty well spent and puny by the time it
>> exits
>> :-) Tell us more about diffusers please; greedy minds want to know.
>> Mikey
>> P.S. "Pandora's Tums...catchy. Now all I need is a text to go with it :)
>>
>
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