IForgeIron Blueprints
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BP0394 Side Draft Forge
by Richard Thibeau
At the Dancing Frog Forge, coal is burned in a side draft forge. The construction is fairly simple as the base of the forge is stacked concrete block with a 4’x 4’ SS diamond plate sheet as the table. The chimney is 10 inch diameter stovepipe sitting in chimney block and resting on the table top. The stovepipe goes up to a commercial metal chimney. No mortar was used on the block, it is stable because of its own weight. The firepot is from Centaur Forge. At the bottom of the stovepipe, a “T” connector was cut out in an arch for the opening facing the firepot. My favorite method of starting the fire is by using a shovel full of coals from the wood stove. It’s simple, quick, and very efficient. During cooler weather (most of the year around here) the wood stove is the first thing to get going, so there is a ready supply of coals.
A little air added to the coals from the wood stove gets them ready for the coal. ' The coal is raked onto the wood coals and a little more air is added. The coal has coke mixed in from the last time the forge was used and catches quite readily. Notice how the flame is being drawn into the side draft of the chimney. More fresh coal is added and the amount of smoke increases, but it is being sucked out and up the chimney. To make this happen easier, either start with a small fire and gradually build it up, or preheat the chimney by placing burning paper or coals from the wood stove inside to start the updraft. The fire is now well established and ready for forge work. The more the air is cranked up, the higher the flames go, and the more draft will be produced to suck the flame, smoke, and heat up the chimney. Fresh coal is piled up along the perimeter of the fire and watered to start the coking process. It will be raked into the middle to maintain the fire as work progresses. There will be little, if any, smoke at this stage. At the end of the forging session, the firepot is shoveled out and the coal fire allowed to die out. The coke can be saved separately or left to be used in starting the next fire. In this session, two hammer heads were heated for tempering and no clinkers were formed. The forge is left as is, ready for the next fire to be made.
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