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    sucky forge details

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    panne
    Fresh Blood

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    Fresh Blood Doesn't meanI'm new to crossbows

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    Post by panne on Thu Feb 14, 2013 12:22 pm

    it's made from 4.5" drill pipe. the front section is about 20" and the
    riser is about 4', welded together at 90 degrees. i trimmed a 6" damper
    plate used for woodstoves and bolted it together in the top of the
    riser. it worked well with only one 5' section of stove pipe, but heated
    much faster when i added another 5' section. at over 10' i had to add
    some guy wires and also couldn't leave it assembled since a good wind
    gust would blow it over. the chimney cap is an aluminum hot water heater
    vent cap. i welded two 1/2" bolts to the bottom and used them to attach
    the heat bent leaf springs leftover from a suspension upgrade on my
    chevy astro camper conversion.

    if i were to do it over i would
    use a 6"-8" pipe, add a clean out at the rear and a fire grate. i'd
    leave the chimney at 4.5"-6". a 6" riser would eliminate the need to
    refabricate the damper and allow more room for larger pieces. the upper
    heavy steel riser should also be completely replaced with stove pipe.
    the thinner the chimney metal the faster and hotter it will get. the
    heavier steel chimney takes longer to heat up making it harder to light.


    i no longer own this one and have another rocket stove i'm
    tinkering with that would work better for forging. the 4.5" diameter
    pipe is too small to heat and bend a stirrup, unless you could manage to
    make all your bends before it cools. i'll try to take a few pictures of
    it, because it's easier to build and more functional. it is basically a stack of bricks
    with a 5' section of 8" double wall chimney sitting on top. eventually it will become the business end of a thermal mass rocket heater.

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    jds6
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    Post by jds6 on Thu Feb 14, 2013 1:38 pm

    Thanks for the details, looking forward to the photos

    jds6
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    Post by Geezer on Thu Feb 14, 2013 8:30 pm

    With a stack that high, you oughta get a great draft. Back in the 1890's, warships had high stacks like that. They developed a great draft until somebody put a few shell-splinters through the middle... then fuel economy went to hell. As long as you avoid a shelling by the Italian navy, you're probably in good shape.
    Geezer... the battleship guy.
    avatar
    panne
    Fresh Blood

    Doesn't mean
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    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 46
    Join date : 2012-10-21
    Location : abbeville, la

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    Post by panne on Fri Feb 15, 2013 6:41 am

    geezer, with a 10' stack it almost draws too much. on smaller parts, i had to pay close attention because it could overheat them pretty fast. on larger projects it heated them pretty quick, but the burn chamber was a bit small to work in. i ended up trading it with a friend who uses it for heating a small workshop. most of the materials came from the dumpster, so it was a no brainer to swap it for his 1966 4 hp mcculloch outboard.

    on another note, i noticed the mention of using charcoal. for those that are new to forging it needs to be clarified that it needs to be hardwood charcoal and not the commercially available briquettes used for grilling. cooking briquettes have a high sulfur content that can weaken the steel. if you don't have charcoal available you can make your own from hardwood using a metal container, to burn it in oxygen starved conditions, until it stops off gassing.

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