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[DoubleG]

I had a very nice lae trap over my east gate, but for some reason 3 out of the 6 nether cap block bridges decided to deconstruct. I think they may have done it when I loaded the game. They were set up with obsidian mechanisms, nether cap blocks. It even worked once to drown Giant in a spectacular pillar of lava. It lasted for over a season, there should have been no reason for it to deconstruct. Couldn't see anything about Nether ca blocks being a case of any bugs, perhaps if i made if from obsidian?

[Schmaven]

When was the last time the bridge was activated?  Maybe another giant gained some size since the last time and is now too big for the bridge?

[Bumber]

When was the last time the bridge was activated?  Maybe another giant gained some size since the last time and is now too big for the bridge?

Pretty sure species adult size is used.

[PatrikLundell]

Nether cap isn't magma safe, so if you get magma on a lowered bridge it should be able to destroy the bridge (I'd expect it to be set on fire, actually). Also, I thought giants were large enough to interfere with bridges (causing them to fail to rise/open while the creature stands on it, or deconstruct when lowered on top of them, and, I think, deconstruct if the creature happens to stand on the swivel tile when you try to raise it).

If your bridge is an opening one that drops magma down on creatures below, I suspect the usage of wood in the construction of the bridge causes it to be destroyed over some time. Despite Nether Cap's description, the wood can't deal with magma (a Nether Cap mine cart sent into magma to scoop some of it up disappeared without a trace, and pumping magma into Nether Cap mine carts resulted in badly damaged carts).

Thus, I'd try magma safe materials for both the bridge and the mechanism (obsidian stone or stone block are both good choices).

[FantasticDorf]

Magma safe is a interaction with the liquid, not the heat, which gratefully bridges are immune to being affected by it because in both states of up and down they have the properties of turfs. Nether caps on the other hand if we use a alternative example catch fire and materially are destroyed, but the contents stay cool as like inside a barrel, with exception to what i've been told is the buggy evaporation of liquids.

I've often wondered if you could use this to a advantage to set up timed barrel traps or dropping nethercap beer barrels in lava to force a explosion (or vice versa, single drop of lava spreads out dropped from above for a chain reaction), but like i've said with the evaporation it limits the uses of extreme sources of heat (dragonfire etc) from having your farming area violently engulf in incinerating flame.

My bets are on a freak bit of magma-mist reached up and just very gently touched your bridge, since the magma mist is the gaesous form of magma, then it check it was magma safe, said no and decided to deconstruct itself based on the wooden material. All obsidian, or glass & obsidian should be relatively cheap and fine for your bridge.

[PatrikLundell]

@FantasticDorf: I fail to understand what you mean. The only meanings of "turf" I know of (and not added to by a single guick Google search) are essentially "grass cover" as in lawn, and the transferred meaning of "my area", neither of which seems to be what you refer to. My limited imagination hasn't been able to come up with any potentially matching word it could be a misspelling of, and I'm not able to figure it out backwards either (i.e. based on what I know of about DF bridges). Could you please clarify the statement?

[DoubleG]

Thanks for the replies all. The bridges are retracting bridges, made from nether cab blocks, placed over my eastern entrance. The giant did stop my entrance quartzite bridge from closing, (bridge survived fine, apart from refusing to shut) but the massive column of lava that dropped on the giant obliterated her without trace. The Nether cap bridges closed fine after, the drop chamber started filling again quickly.

I saved and reloaded and, after a while, noticed the 3 bridges closer to the inflow had deconstructed and there was a bit of extra lava where it shouldnt be. CAn't seem to reproduce it but it might be safer toi go over to something more conventionally magma safe.

[PatrikLundell]

I've had problems when I've tried to construct a "3D printer" to wall off a very high cavern (20+ Z levels, and probably more) in that the mechanism gummed up with obsidian because fluid somehow remained when it shouldn't have).

[FantasticDorf]

@FantasticDorf: I fail to understand what you mean. The only meanings of "turf" I know of (and not added to by a single guick Google search) are essentially "grass cover" as in lawn, and the transferred meaning of "my area", neither of which seems to be what you refer to. My limited imagination hasn't been able to come up with any potentially matching word it could be a misspelling of, and I'm not able to figure it out backwards either (i.e. based on what I know of about DF bridges). Could you please clarify the statement?

Sorry, force of habit, i mean things that aren't objects (placed objects in the world, tables, chairs, loose objects) or units (dwarves, goblins) but rather the landscape (as in the natural and built features like "A tower made entirely from soap bars", that isn't affected by things it ought to be, like dragonfire or just plain dirt/rock turf not melting underfoot of a dragon's breath)

Units and objects are affected by temperature (you can drop the temp in arena so cold that giant insect bodies accrue damage as well as kill off the insect without insulating fur like a yeti) while ice and trees are coded seperately when coming into contact with sources of fire and magma.

[DoubleG]

Managed to reproduce it. This time when the chamber was full above. All the bridges deconstructed. It must be when I reload. Perhaps the nether cap cap forgets it's supposed to have a fixed temperature for a second on loading. Obsidian this time, at least they all deconstructed.

[DwarfStar]

I just built about 150 nether cap mine carts recently because I didn’t understand that didn’t work. Nether-cap is an interesting material, but it can only be used for magma applications like screw pumps where the magma is just adjacent to the nether-cap and never on the same tile. In that specific case the temperature property of nether-cap protects it.

[DoubleG]

I think it only happens when the lava is on the same tile, like with retracting bridges, and you load the game. First time only the bottom 3 bridges deconstructed as the lava chamber wasn't full, only those bridges were covered. Second time the whole thing was covered when I loaded up the game.  If I don't load the game it seems to last fine. I guess it might be considered a bug.

Dwarfstar, I'm not sure about minecarts made from nether cap. I reckon they would be fine unless you reloaded the game when they were full, but loaded magma might be considered different to loose lava. I think there might be some !science! testing there.

[DwarfStar]

I imagine a loaded nether-cap minecart actually might be able to hold magma. The problem is, there’s no way to fill them because they turn into smoke instantly when they enter the magma tile. I disposed of mine...in the magma incinerator.

[DoubleG]

Ahh !science! done. Nthercap does seem to have odd properties. My raising nether cap bridges that I use elsewhere seem to be fine, raised or lowered. Minecarts burn, and retracting bridges deconstruct on reload. Seems pretty odd.

[DwarfStar]

It might be that saving and loading just causes some temperature recalculations that would have happened anyway eventually, but maybe not before the magma evaporated otherwise. In which case it’s not exactly a bug as much as a “lossy” side effect of temperature CPU cost management. Or it could be something else entirely.