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[petersohn]

So, I built a retracting bridge from kaolinite and used quartzite mechanisms to link it to a lever. I let magma on it, and, being magma safe, it didn't melt for years. But as soon as I pulled the lever, the bridge deconstructed. The mechanism is still there and hasn't melted yet. Is there any way to control magma safely in DF2010?

[FleshForge]

I have not had this problem with bridges and magma.  Are you sure the lever-side mechanism was magma-safe also?  Logically it shouldn't matter, but it wouldn't surprise me if it does.

edit: actually now that I think of it, you're not the first person reporting that kaolinite is acting as if it isn't magma-safe even though it should be.  I can tell you for sure I've controlled magma with bridges made of other materials, e.g. mica or obsidian.

[petersohn]

Then I'll try it. Both mechanisms were made out of quartzite I think. The lever is either marble or siltstone.

[Fellhuhn]

The lever and the mechanism in the lever shouldn't matter as long as both are not in the magma... but you wouldn't be able to pull them then, right?

[FleshForge]

Yeah it shouldn't matter - but maybe it does anyway.

[WrathNail]

The kaolinite floodgates in my magma channel are still good to go, so.. The bridge shouldn't deconstruct either me thinks. All I can say is check if those mechanisms were really made of quartzite.

[gtmattz]

Something to keep in mind, and may possibly have something to do with this situation, is that if ANY of the mechanisms in the magma-submerged device are non-magma safe, the device will deconstruct when the lever is pulled.  I found this out by building a bridge and linking it to a lever then realizing I had linked chalk mechanisms, so I removed and re-built the lever, and re-linked with some bauxite mechanisms.  What this did, however, was left a chalk mechanism in the bridge from the first linkage.  When it came time to use the bridge it deconstructed, I am assuming because of the chalk mechanism, even though that one was no longer being used.

[petersohn]

It seems that the bridge didn't really deconstruct. I just couldn't see it because the 'q' screen hides the top line in DF2010 (a very annoying bug indeed). That doesn't explain the mechanism I found lying around there, which made me think it deconstructed in the first place (plus past experiences with doors). It may have been there all the time, hidden by a "pool of magma", then got washed away by the flowing magma, revealing it.

On another note, what's up with doors? I had them deconstruct when controlling magma before (kaolinite, too). I guess it is something like doors can't crush magma, or some other items were washed in the way, and doors can't atom-smash them, so it deconstructs when I close them.