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coal forges


AndrewJohnKarow

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Hey guys I'm back and I'm wondering how I should build my new coal forge. The one I currently have is a fire extinguisher that I cut in half and attached a shop vac to the bottom. It works but I can only heat blades two to three inches long. So I'm wondering if there's a better way.

Andrew Karow

 

Of the four elements, air, earth, water, and fire man stole only one from the gods. Fire. And with it, man forged his will upon the world."-anonymous

 

The Armorers accomplishing the knights, With busy hammers closing rivets up, Give dreadful note of preparation." -Shakespeare

 

“The pen may indeed be mightier than the sword, but the wordsmith would do well to welcome the blacksmith back into the fold, so that artisan craftsmanship the world over may fend off the ravages of industrialised homogeneity and bland monoculture.” -Alex Morritt
The blacksmith is the heart of the pack, and the blacksmith is the heart of the pack. - Me
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Charcoal or mineral coal? They prefer different setups, but whichever one you use a shop vac is WAY too much air. My Centaur coal firepot is about 8x10 x 4" deep, bottom blown, and can heat about six to eight inches at a time to forging heat, around four inches for welding heat. That's fine, since that's about all you can forge in one heat anyway.

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its mineral coal. (I was lucky to find a deposit in the cliffs near my house!) and the shop vac is a 2.5 hp 1 gallon type with a flow control made from the fire extinguishers leaver. Mine is also bottom blown. I'll post some pics soon.

Edited by AndrewJohnKarow

Andrew Karow

 

Of the four elements, air, earth, water, and fire man stole only one from the gods. Fire. And with it, man forged his will upon the world."-anonymous

 

The Armorers accomplishing the knights, With busy hammers closing rivets up, Give dreadful note of preparation." -Shakespeare

 

“The pen may indeed be mightier than the sword, but the wordsmith would do well to welcome the blacksmith back into the fold, so that artisan craftsmanship the world over may fend off the ravages of industrialised homogeneity and bland monoculture.” -Alex Morritt
The blacksmith is the heart of the pack, and the blacksmith is the heart of the pack. - Me
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Even the little shop vacs are way too much air, which with coal will give a very small very hot fire. And I hope your free coal is good! Not all coal is equal, which is why metallurgical coal sells for nearly $200/ton and bad stove coal sells for around $75/ton. If it's fairly hard and shiny with no yellow or greenish spots or inclusions, and it cokes up rather than just turning to ash, it may be decent.

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then its great coal it doesn't create much ash at all it just burns away

Andrew Karow

 

Of the four elements, air, earth, water, and fire man stole only one from the gods. Fire. And with it, man forged his will upon the world."-anonymous

 

The Armorers accomplishing the knights, With busy hammers closing rivets up, Give dreadful note of preparation." -Shakespeare

 

“The pen may indeed be mightier than the sword, but the wordsmith would do well to welcome the blacksmith back into the fold, so that artisan craftsmanship the world over may fend off the ravages of industrialised homogeneity and bland monoculture.” -Alex Morritt
The blacksmith is the heart of the pack, and the blacksmith is the heart of the pack. - Me
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then its great coal it doesn't create much ash at all it just burns away

 

Here is a decent video on starting a coal fire:

 

 

Notice how gentle the blast is after it cokes out and is ready for forging.

 

Good coal = cokes well, hot, low ash, low clinker

 

Bad coal = won't coke well, low heat, lots of ash, clinkers that would choke a horse

 

On a 1 to 10 scale, I've used 1 (free from the church basement) to 10 (Blacksmith Depot bituminous).

 

I takes a little experience and experimentation to know the difference.

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