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« on: December 20, 2009, 12:10:22 pm »
For question 1, magma pipes are not static in size, one level might be (roughly) 20x20 and then a level up or down from that may by 15x15 or 25x25 (again, roughly, I'm sure you know they're not square) so to find out mine upward and over towards what you think the center is, when you find the cap, which will be an open space area with visible magma, it will reveal the entire magma pipe or pool.
For your second question, let's take a smelter for example:
-X-
---
---
That's the shape of the smelter with the X being the blocked space, beneath that blocked space you need a channel and in the channel at least 4/7 level of magma. The channel only needs to be in that one space, the rest should be normal floors. So, dig out a long pipeline up to the edge of the magma pipe (not into the pipe just yet) leading out towards your fort, I tend to do something like:
#########
#
#################
#
#########
With enough room for multiple smelters, forges, kilns and glass furnaces for expansion in the future, the # simply being dug out spaces, if you keep in mind that the buildings are all 3x3, each fork should run under the middle of your line of buildings, that way whatever tile you need to channel out will get filled with magma.
After you get your tunnel for the magma to flow set up, you're ready to let the magma flow, almost.
|MM
#####|MM
|MM
the # is again the dug out spaces with | being the wall right next to the volcano and M being the magma. You can place a floodgate and link it to a lever in the # spaces if you want, this lets you stop the flow from the volcano after your channel is full but it isn't really needed unless you're planning multiple magma things like moats and the like where you need to stop the flow right near your smelters and open another channel to fill the moat. From that depiction, you'll want to go up a level, preferably where the volcano is smaller than the level your tunnel is on so that you can have a miner stand next to the spot where the # meets the | and channel it out, letting the magma flow into the tunnel. Seal the downward stairs first, either with a locked door or hatch over the stairs so that your miners don't for some reason go back down and get killed (it's happened to me before) then channel out that space and enjoy smelting/forging with no fuel.