This quite simple machine repeatingly creates cave-ins. If you place it over a chasm or bottemless pit it can generate cave-ins forever. I think this is on of the coolest but also one of the most useless and anoying machines ever made in DF.
Idea and concept: http://www.bay12games.com/forum/index.php?topic=39629.0
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Submitted by: Kami - 2009-10-31
http://mkv25.net/dfma/movie-1578-obsidiancave-ingenerator .oO( Of course someone did it before me... )
Submitted by: Kanddak - 2009-11-01
Very nice.
I do notice that it tends to indiscriminately slop magma all over. Any ideas for how to prevent that? Maybe some kind of synchronization logic?
I'm also curious about the edges of the reaction channel. How do you have that set up to keep support away from the cave-in tile? It looks like you have raised drawbridges, but don't those need to be built over floors, which would support the tile?
Submitted by: Kami - 2009-11-02
I donīt think you can totally avoid it. Maybe it has to do with fluctuations in the speed magma and water is pumped. I have seen moments where magma on the bridge was only 3/7 while water was 7/7. Probably making the magma- and watersupply whider could help. I donīt know if you can build a retracting bridge in the center.. Hmmm, Iīll test it.
How it workes: Bridges donīt give support. The long 5x1 bridges north and south are raised and work as walls. The short 2x1 bridges work as floors. Unter and over the center is a free space of 9x9. so there will be no support in every direction. (Iīm not sure if the obsidin is created on the level of the bridges or water and magma combine one level under it, because the cave-in message is taking you there.) You build the bridges north and south on top of a 5x1 wall, raise the bridge and remove the three wall elements afterwards.