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[Rysith]

are floodgates the only thing that require bauxite mechanisms to be used repeatedly in magma? what about a bridge that will have magma on top of it / falling through it. or floor hatches, etc?

Anything with a mechanism that will have magma on the same tile will need a bauxite mechanism. The rest of it needs to be magma-safe too, but you can make iron floodgates and such, so it's not as big a deal. So, if you wanted a bridge that would have magma on top of it, you would need to build the bridge out of something magma-safe (like iron, steel, or nickle silver) and the mechanism out of something magma-safe (like bauxite). The same for magma-covered pressure plates, magma-covered doors, magma-covered traps, and so on.

Anything that will not have magma on the same tile, or that is a construction (fortifications, walls, closed doors, non-flooded screw pumps, etc.) does not need to be magma safe. A wooden screw pump will pump magma just fine, as long as magma never gets onto the passable tile. Similarly, a closed wooden door will hold back magma.

[Savok]

RTFM: Wooden screw pumps will pump magma but rapidly become damaged and soon self-destruct. Any other material works, though.

[LegoLord]

One thing I feel I should point out, glass is a good thing to have when working with magma, as the furniture, blocks, and weapons are magma proof.  There is a mod in the community mods and utilities list (stickied thread under "modding" sub-forum) that allows more items, such as mechanisms, to be made from glass. 

[Hyndis]

Just put the [ANY_USE] tag on a metal and you can make mechanisms out of the metal. For example, steel mechanisms.

But even without doing this you really don't need any bauxite at all if you're lever about the design. For example, just use iron or steel pumps to move the magma. Granted you need to use two Z levels instead of just one for this, but its quite doable. Magma is also not pressurized, so there's no dangers with that.

[LegoLord]

Just put the [ANY_USE] tag on a metal and you can make mechanisms out of the metal. For example, steel mechanisms.

I thought Toady himself said not too long ago that metal mechanisms were not possible.

[Deathworks]

Hello!

Directed at the OP:
If the site you have really has no bauxite and you really, really love it, you should restart with a different dwarven civ. If you don't have enough choices in the dwarven civs or none of them have bauxite, there is actually one last option for you:

Change the number of civs and generate the world again.

The physical map of the world will be the same, but history will differ and hopefully, you will get dwarves who own settlements in mountains offering bauxite. In which direction you wish to change the number of civs depends a bit on your world. In general, increasing the number of civs should help you get a dwarven civ with bauxite - but you will have to wade through many civs. If you have only few mountain chains or very little land between them, decreasing the number of civs may also work if you get a dwarven civ to claim most of the mountain area - this would have the benefit of having really awesome trading partners who can bring you everything you like.

However, this would require some world genning and experimenting, so you better have some spare time for it.

Good luck.

Deathworks

[Hyndis]

Just put the [ANY_USE] tag on a metal and you can make mechanisms out of the metal. For example, steel mechanisms.

I thought Toady himself said not too long ago that metal mechanisms were not possible.

Not easily, but just go to a forge, adamantine, trap components, and mechanisms will be there.

I just made it so you can make metal mechanisms without having to use adamantine.

[Kanddak]

Change the number of civs and generate the world again.

The physical map of the world will be the same, but history will differ and hopefully, you will get dwarves who own settlements in mountains offering bauxite.

That won't help him if he's generating worlds with max volcanism.

But even without doing this you really don't need any bauxite at all if you're lever about the design. For example, just use iron or steel pumps to move the magma. Granted you need to use two Z levels instead of just one for this, but its quite doable. Magma is also not pressurized, so there's no dangers with that.

Magma does become pressurized when pumped.

[Hyndis]

Change the number of civs and generate the world again.

The physical map of the world will be the same, but history will differ and hopefully, you will get dwarves who own settlements in mountains offering bauxite.

That won't help him if he's generating worlds with max volcanism.

But even without doing this you really don't need any bauxite at all if you're lever about the design. For example, just use iron or steel pumps to move the magma. Granted you need to use two Z levels instead of just one for this, but its quite doable. Magma is also not pressurized, so there's no dangers with that.

Magma does become pressurized when pumped.

I've never seen magma become pressurized, ever. And I frequently use magma pumps to lift magma up to my workshops, in the case that the magma pipe's top is too low that I can't simply use a sacrificial dwarf to passively power the workshops.

Channeling holes in the workshop floor doesn't cause magma flooding either to pumps or to natural magma flows.

[Mechanoid]

And I frequently use magma pumps to lift magma up to my workshops

if the lava ever has to flow below the level of the pump, it will become pressurized then. obviously it won't flow above the level of the pump it was pumped from; but it will flow to the level of the pump it was pumped from.

[Kanddak]

I'll let the evidence speak for itself: http://mkv25.net/dfma/movie-1116-magmapressure

[LegoLord]

Just put the [ANY_USE] tag on a metal and you can make mechanisms out of the metal. For example, steel mechanisms.

But even without doing this you really don't need any bauxite at all if you're lever about the design. For example, just use iron or steel pumps to move the magma. Granted you need to use two Z levels instead of just one for this, but its quite doable. Magma is also not pressurized, so there's no dangers with that.

Okay, you're right.  But for some reason the only work order related to mechanisms from the manager menu is "construct mechanisms" not "construct adamantine mechanisms".  It also has the added side-effect of allowing you to forge clothes from the metal.

[LegacyCWAL]

Instead of vulcanism, I usually jack up the number of volcanoes.  You probably don't wind up with as much magma that way, but you do get a lot of magma pipes popping up in pretty much any surrounding.

[Bryan Derksen]

If what you need is an emergency or rare-use "floodgate" to shut off a magma channel, you can build one that doesn't require any equipment other than a wooden bucket and a source of water. Simply build a staircase next to the magma channel to create a dwarf-accessible one-Z-level drop onto the magma, and then designate a "pond" over the magma. Whenever you need the magma shut off just order that the pond be filled. A dwarf will grab a bucket of water and turn the tile of magma under the pond designation into obsidian. To reopen the channel just re-channel the obsidian tile.

If you need a more rapid and reliable response than waiting for a dwarf to haul a bucket, you can create a single-tile reservoir over the magma channel with a door or hatch that dumps the water onto the magma. The hatch or door only contains water, so it needn't be magma-safe to be reusable.

I've tried having dwarves dump water directly onto magma but it seems that when using a single bucket-load you need the water to fall a Z level before it hits, otherwise the water evaporates without cooling the magma sufficiently. I think a reservoir with more than 1 water level in it can be dumped directly onto magma, though I haven't tested this as much.

[Hyndis]

Just put the [ANY_USE] tag on a metal and you can make mechanisms out of the metal. For example, steel mechanisms.

But even without doing this you really don't need any bauxite at all if you're lever about the design. For example, just use iron or steel pumps to move the magma. Granted you need to use two Z levels instead of just one for this, but its quite doable. Magma is also not pressurized, so there's no dangers with that.

Okay, you're right.  But for some reason the only work order related to mechanisms from the manager menu is "construct mechanisms" not "construct adamantine mechanisms".  It also has the added side-effect of allowing you to forge clothes from the metal.

Yup. Its an odd oversight that you have to manually order metal mechanisms from the forge instead of using the manager, and yes it also lets you make clothes out of steel. But I just restrain myself from doing that, and instead just use the mechanisms. After all, steel would be a far better candidate to make a mechanism than a block of stone. Stone tends to be too brittle, whereas metal is just flexible enough for machine parts.