Former Abilities: Crossdraft kiln
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Primitive Technology: Crossdraft kiln - Building a crossdraft kiln from scratch.
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About This Video:
I built a cross draft kiln and fired a pot in it to test ideas about how cross draft kilns operate. A cross draft kiln is one in which the flames travel from the firebox and across a horizontal wear chamber before traveling vertically up a chimney and out of the kiln. Unlike an updraft kiln there is no perforated floor that the pottery sits on. Instead the pot sits on the floor of the wearchamber as the flames pass around it.
Taking soil from a previous kiln and mixing it into mud, I formed the kiln so it was less than a meter long. It was 25 cm wide and tall inside the tunnel formed by the kiln though a slight curve was added to the tops of the side walls. The walls were covered with sticks and a roof of mud was put in place onto this. A chimney about 25 cm wide and 65 cm in total height was made at the end of the kiln to draw flames through the kiln due to natural draft. 5 grate bars made of clay were installed in the firebox to make combustion more efficient. A side door was cut into the kiln to access the ware chamber (25 x 25 cm).
Clay was taken from the creek bank and mixed with previous crushed pottery as grog. It was formed into a pot with a pouring spout. This was dried and then placed into the kiln. The kiln was fired with the flames acting as planned and the pot was fired in a relatively short 1 hour and 20 minutes. It would have been a shorter firing time had the kiln not still been wet. The pot was tested with water and held it satisfactorily.
Cross draft kilns are an apparent improvement on updrafts with the reasoning being that more efficiently retain heat as the hot gasses don"t immediately exit the kiln leaving the colder gasses inside. Hot spots are less likely to develop giving a more uniform firing of the pottery. Cross draft kilns developed early in Asia, evolving from the practice of excating tunnels into the side of hills to fire pottery. It"s unknown whether the European cross drafts were adopted from the east or were the result of the gradual extension of the firing arch outwards from the conventional updrafts. My personal experience is that this type of kiln fires quickly and evenly though I need to experiment more to understand the positive and negative aspects more fully.
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Primitive technology is a hobby where you build things in the wild completely from scratch using no modern tools or materials. These are the strict rules: If you want a fire, use a fire stick - An axe, pick up a stone and shape it - A hut, build one from trees, mud, rocks etc. The challenge is seeing how far you can go without utilizing modern technology. I do not live in the wild, but enjoy building shelter, tools, and more, only utilizing natural materials. To find specific videos, visit my playlist tab for building videos focused on pyrotechnology, shelter, weapons, food & agriculture, tools & machines, and weaving & fiber.
Transcription
Scribbing kiln footprint (about 85 cm by 25 cm) Crushing up pieces of old furnace Water Mixing mud Layer 1 Digging out pit for fire box Layer 2 Layer 3 Layer 4.
Layer 5 Making top of side walls curved to form an arched profile (from front to back) Bridging the gap with sticks Adding mud roof. The curved profile helps prevent roof collapse Building the chimney to create the draft effect Digging a side door to access the pottery Adding to chimney Making grate bars from clay Adding side shelves to hold grate bars.
Installing grate bars. These hold the fuel off the ground so air can come up through the fuel bed, increasing combustion efficiency several times. Making fire with firesticks Fire started at entrance of firebox Crossdraft effect working Chimney draws hot air through kiln Adding to chimney as fire helps dry it Creek bank Digging clay Clay into pit.
Slake with water Crushing old pottery as grog (prevents clay from cracking during firing) At hut Wood ash to stop clay sticking to rock Lump of clay Form an "ash tray" as the base of pot Add coils of clay to increase height Some time was left between adding layers so that the pot stiffened as it was being built. This prevents slumping. Adding a spout.
Putting pot in kiln Closing up kiln door Sealing door shut with mud Starting fire in ash pit of loaded firebox so that the wood on the grate bars catches fire Flames travel right to the back of the kiln almost immediately You can just see the edge of the pot through the top of the chimney In about 30 minutes flames reach the top of the chimney About an hour in Pot is glowing orange hot at about 1 hour 20 minutes.
Opening kiln about 4 hours later Taking out pot carefully Fired pot Water test Holds water and pours it satisfactorily Making a new kiln, and so the cycle repeats. Crossdraft kiln
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Author: Author Link: Youtube Link: https://www.youtube.com/watch?v=RnvtXikwrIU Category: Channel Name: Primitive Technology Channel ID: 28 Tags: primitive,crossdraft,kiln,primitive technology crossdraft kiln,primitive technology cross draft kiln,crossdraft kiln primitive technology,cross draft kiln primitive technology,primitive technology,crossdraft kiln,cross draft kiln,cross draft,primitive,technology,crossdraft,kiln,building a kiln,how to build a kiln,building a kiln from scratch,building a crossdraft kiln,how to build a crossdraft kiln,building a crossdraft kiln from scratch,how to build kiln,how to build crossdraft kiln,
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7 thoughts on “Former Abilities: Crossdraft kiln”
9:39 subtitles: “and so the cycle repeats” XD
Can u supply the Walmart say number please?
Does the arched roof abet in producing more heat or is it factual for strength of the structure?I mediate I'm going to originate one thing luxuriate in this nevertheless I'm going to are trying to originate a mountainous removable high as a change of the tiny aspect door.
couldn't one originate the chimney barely taller and keep apart three notches on high to behave as a range
Is this mud? Kinda seems luxuriate in clay. If that’s the case, where gain you peek this worthy clay in a bizarre forest?
A mud rocket range kiln, that used to be amazing. Thanks John.
что не делает то печка)