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[dwarfguy2]

so i had this idea which i might be able to make endless supplies of obsidian, so i want to know, could it work?

basically the idea is moving the lava in a certain way with dwarf-made tunnels, and then run into a floodgate to stop it's movement. then i would do the same to some water in a tunnel adjacent to the lava, then hook up a lever to both floodgates and that should give me obsidian. would that work?

[MrFake]

That's the right idea.

Though, it's safer to drop the magma on the water or the water on the magma.  With the water and magma on the same level, there is the potential to create obsidian on top of the floodgate, door, or bridge, preventing their operation (the bridge works as normal, but there's still an obsidian wall blocking the way).  It may be sufficient to pump magma and water into the same space, but you won't have the same output as dropping one onto the other.  Just fill a room with magma, fill a room above it with water with the entire floor made of retracting bridges, then retracting the bridges.

[Derakon]

You definitely need to drop one of the fluids on top of the other; otherwise, you just end up with a pool of magma, a pool of water, and an obsidian wall between them.