To do that, you need to drain any excess magma and let your workers in through the access corridor. After letting magma in, and dropping the piston, you'll want to dig out the bottom of the piston so you can drop it again. The magma reservoir needs three parts: a magma inlet, a magma drain, and an access corridor. This will allow the piston to rest on the floor of your reservoir. The magma reservoir is artificial, so it won't have a floor made of semi-molten rock. You can't actually drop the piston directly into the magma sea because the bottom of the magma sea is semi-molten rock, and it will completely destroy any piston dropped into it. Magma reservoir The magma reservoir is dug out near the magma sea. If you need a catchment area smaller than possible with bridges or floodgates, you may use a floor-less floodgate to prevent the magma entering that square, while keeping the piston free to fall. You can also make the catchment area multiple z-levels deep. If the depth is greater than 2, then you're wasting magma if you cast it into obsidian. If the depth is 1, then the magma might evaporate and you won't be able to repair your piston. Ideally, you want the depth of the magma above the piston to be 2. The volume and size of the catchment area must be carefully calculated to ensure that you won't have too much or too little magma above the piston for casting. In a repeating magma piston, some of the magma is used to cast obsidian on top of the piston, in order to reuse it. After the piston is dropped, the magma will spread out around the catchment area. The magma will teleport to the top of the piston, as shown in the following diagram:Ī magma piston is composed of 4-5 parts: the catchment area, the magma reservoir, the support, the piston, and the obsidian caster (optional).Ĭatchment area The catchment area is located at the top of the piston. When the support is destroyed, the wall sections in the middle will fall down into the magma. Key: # = Wall ~ = Magma S = Support _ = Floor hatch or bridge (your choice) Basic magma piston design (side view) # Liquids displaced by a cave-in will "teleport" straight up to the nearest available space here, the nearest available space will be the catchment area you thoughtfully prepared earlier atop the piston.Ī simple magma piston works as shown in the following diagram: ( Beware: building the piston directly over the magma sea will NOT work!) Once the tank has been filled, drop the piston by removing its support. Rest the piston on a single support, then carve out a tank at its base which will be filled with magma pumped from the magma sea. The basic principle involves channeling out an area around a huge stone pillar, hundreds of z-levels tall, which will become the "piston" that drives magma to the top. The piston method is based on a clever abuse of cave-in physics.
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