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Posted by theChas. on February 18, 2007, 1:01 am
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I imagine a propane forge would be as noisy as the rivet forges the railroad
here used to use. Very noisy. One could hear them a mile away. So one
should not consider using a propane forge in a city. Right?
. . . .Next, how many burners would a propane forge need to be able to
easily heat an eight pound sledge hammer head, so it could be worked?
--
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Posted by Pete Keillor on February 18, 2007, 6:53 am
Please log in for more thread options On Sat, 17 Feb 2007 23:01:38 -0700, "theChas."
>I imagine a propane forge would be as noisy as the rivet forges the railroad
>here used to use. Very noisy. One could hear them a mile away. So one
>should not consider using a propane forge in a city. Right?
>. . . .Next, how many burners would a propane forge need to be able to
>easily heat an eight pound sledge hammer head, so it could be worked?
The one I built my son isn't that noisy. We run it in the garage, and
if it were objectionable, SWMBO would have let us know. I wear
hearing protection when something's really noisy, like a 4.5" grinder.
This isn't bad at all. I patterned it after Ron Reil's designs, i.e.
naturally aspirated. A forced air design would probably be a little
noisier, depending on the blower.
Objectionable in this town would have been a coal fired forge, which
is what the kid wanted. And SWMBO would have blown a fuse at a 12"
galvanized duct sticking 4-5' above the roof ridge line.
Pete Keillor
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Posted by Kyle J. on February 18, 2007, 1:47 pm
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>I imagine a propane forge would be as noisy as the rivet forges the
>railroad
> here used to use. Very noisy. One could hear them a mile away. So one
> should not consider using a propane forge in a city. Right?
> . . . .Next, how many burners would a propane forge need to be able to
> easily heat an eight pound sledge hammer head, so it could be worked?
>
Not at all! Of course if you are planning to heat eight pound chunks of
metal you will need to crank up the volume a bit... I use a chamber with an
inside volume that is about eight inches in diameter by 2 foot long and I
hold it at 1750-1900F with a flame that is barely audible. If I need to
crank it up for welding heat then it has a soft roar. Not what I would call
loud though. This is a T-Rex burner and the forge chamber is lined with a
couple of inches of Inswool. I have a commercially made forge that runs on
forced air and is considerably louder and a LOT less heat efficient that I'm
not at all happy with... My T-Rex in the forge I made would heat your
hammer head to forging temp in about 15-20 min - single burner. Personally
I would use a more robust design if I was interested in forging that much
metal.
GA
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Posted by Trevor Jones on February 18, 2007, 2:04 pm
Please log in for more thread options theChas. wrote:
> I imagine a propane forge would be as noisy as the rivet forges the railroad
> here used to use. Very noisy. One could hear them a mile away. So one
> should not consider using a propane forge in a city. Right?
> . . . .Next, how many burners would a propane forge need to be able to
> easily heat an eight pound sledge hammer head, so it could be worked?
>
>
>
I have no idea what you heard from the railyards, but I am certain it
was not a rivet forge. A rivetting hammer perhaps, along the lines of a
pneumatic hammer?
All the forges I have been near are pretty quiet, its the equipment
around them that make noise that could be heard from outside the room,
stuff like power hammers and the like.
A propane forge usually runs pretty quiet, a dull roar at best, but
nothing that is loud enough to require raising ones voice to be heard
over, until one gets into seriously BIG forges.
To work a lump large enough to make an 8 pound sledge head, you will
need a forge large enough for it to fit into, that is all. It will heat
faster if there is some thermal mass in the forge walls for it to draw
heat from, otherwise the cooler mass acts as a heat sink, and cools the
whole interior space. This is less of an issue with ceramic wool lined
forges, as the material has little mass to heat and cool.
Cheers
Trevor Jones
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Posted by heChas on February 19, 2007, 3:15 pm
Please log in for more thread options > I have no idea what you heard from the railyards, but I am certain it was
> not a rivet forge. A rivetting hammer perhaps, along the lines of a
> pneumatic hammer?
************
It was rivet forges ok... on 90 pound natural gas and 150 air pressure.
Boxes about 18 inches or 20 inches on all sides.
I really missed the boat. Up until 1984 we had 3 blacksmith shops here,
owned by the Anaconda Company. One at the railroad, one at a company
foundry, and one on the smelter. I even knew one of the railroad
blacksmiths, but never thought in a million years I would ever developed an
interest. I was once in the smelter blacksmith shop in about 1954 as they
re-bent (cold) a set of main leaf springs for my friend. There must have
been 24 men there, with the laborers, journeymen, and apprentices. I don't
know how many worked at the foundry, but I know they had some huge steam
hammers. Parts of the movie 'Runaway Train' were shot in the blacksmith
shop on the railroad. And the roundhouse locker-room.
--
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