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[melphel]

Wait, why can't you still do a bridge over floor grates?  Grates might not be able to support each other, but you can just make a smaller room, or devise a pattern in which to put the grates so that they are more spread out but still connected to an anchoring wall/floor.

Maybe I'm not understanding the set up you are thinking of.  You want to have a bridge with magma on it that you can dump gobbos on?  And then you would retract/raise the bridge to drop the magma + goblinite onto the grated floor below?  If this is it, I don't see why it wouldn't work....if it isn't what you were thinking of, then consider this application instead!  If you use the same magma being drained through the grates to refill the bridge, you'll even have a closed system and won't need to bring up more.

[Intro1827]

melphel, that's the idea, but since grates won't connect to each other, a floor made only of grates is impossible. Making smaller grates sections surrounded by walls/floor might be the next best thing, at least it'll get rid of a lot of magma.

Something like this, maybe

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###
#+#
###Place floors on walls and link grates all around. Yeah, sounds good

[melphel]

iirc, grates can't be supported diagonally.

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.#.
#+#
.#.would be your base, fortunately, this shape can tessellate.

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###+####+###
#+####+####+
####+####+##
##+####+####
+####+####+#
###+####+###

[Intro1827]

Right, nothing can be supported diagonally. And yeah, that looks good, plus grates all around supported by walls

[Vindictus]

Magma pressurizes when pumped, ya?

Build a multi-layer pit, then set up a 'grate' floor, and then set it so it'll drain into your obsidian factory.

'Grate' floor-
O=floor
#=grate

##0##0##0##
##0##0##0##
0000000000000
##0##0##0##
##0##0##0##
0000000000000
##0##0##0##
##0##0##0##

This grate floor is set up for maximum drainage/stability. It could also be set up

##0##0##0##
##0##0##0##
##0##0##0##
##0##0##0##
##0##0##0##
##0##0##0##
##0##0##0##
##0##0##0##

which would allow for even more drainage, but still leaves some issues if a cave in destroys one or two squares of the 'support beams'. Not that that should be a real issue, honestly, but better to be safe with your deathtraps, right?

[ohgoditburns]

How big do you need?

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=====
#####
#####
=====
2-wide, use all grates

%%%%%
.....
#####
#####
.....
%%%%%
4-wide, use grates + pumps on either wall



[Oaktree]

I drain mine out via a magma-proof floodgate that leads to a grate over a "sump".  Grate holds the good stuff for picking up.  And the same access tunnel is also where I have a pump installed for pumping magma from the sump back into the pit.  The sump itself is connected to the main magma reservoir of my fortress via floodgate and fortifications in case I ever need to refresh the supply (and for the initial filling).

Oh, and depending on the surface you want to floor/pave the sump.  Otherwise you might get a tree growing there that blocks the drain.  Imagine being the dwarven woodcutter "volunteered" to go and clear that out... 

[Wistil]

Woah woah... you don't need to go through all that to get a room full of grates to catch the goblinite and let the magma drain through.  You can construct grates over a room full of down staircases.  I've not tried using just downstairs alone because it doesn't look all that great.  I tried this back in the 40d days but it was horrible because the grates flashed when placed over stairs but not anymore.



Personally I like this design for cooking my goblins:

Spoiler (click to show/hide)

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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#  <-- MAGMA!
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#
#=================================#  <-- Bridge
___________________________________  <-- wide (~3-5 tiles) grated hallway that can be sealed
#                                                        #
#=================================#  <-- Bridge
#                                 #
#                                 #  <-- Magma catchment
#                                 #
#_________________________________#


You could reverse it so that the 2nd bridge is the one the goblins walk over and below that is the grated goblinite catcher so you can retrieve the spoils of magma safely.

[Ace_Warbringer]

but better to be safe with your deathtraps, right?

SAFE!?

You elf...

[Intro1827]

See, I knew there was something very simple I was overlooking. Grates over stairs, that's perfect. Thanks a lot