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[Ashery]

What the hell is checked when buildings collapse? Using a slightly modified (Mainly for higher volume) water tower setup.

Planned it to look like this upon completion:

Code: [Select]

P = pump
. = water on level below
w = water on current level
o = gear assembly
- | = axles in their respective direction
m = waterwheel (There are more planned off to the left)
# = unmined wall

Level Z
######D###
......PPw#
......|###
.mmm..PPw#
.mmm..|###
.mmm..PPw#
##|###o###
--o---o###

Z+1
#######D##
#####wPP.#
####### ##
#####wPP.#
####### ##
#####wPP.#
##########
##########

Z+2
######D###
#####.PPww
###### #ww
#####.PPww
###### #ww
#####.PPww
##########
##########
Note that I focused only on setting the southernmost pumps up initially so that I could flood my farmland quickly...Not going to require the high volume for a year or two..

I set this up using the standard method of channeling underneath the solid segment of the pump in order to transmit power easily. Completed the southmost pump on the top two levels and resumed construction on the bottom pump (I wanted to move some obsidian from behind the pump) while I went about setting up various levers for flooding my farms.

Came back a couple minutes later...and the top two pumps collapsed in on themselves and the bottom one either failed to be constructed or collapsed as well...despite the bottom one being constructed entirely over solid ground...

How the hell did this happen?

[Magua]

The pumps require something underneath the "out" end.  Try to place a pump in a pump tower where the "out" end has no floor, and there's no pump below, and you'll see that it won't let you.

What you're running into is that it allows you to build pumps even when there are only designated, but not yet built, pumps.  It gives you a certain amount of time after the building of the pump to complete the one below it -- if you make it during that time, great.  If not, it collapses, as you've seen.

The solution is to build your pump towers from the bottom up, not from the top down. 

(You can see the same behavior with, eg, water wheels.  Put a gear next to a river, and then build two water wheels as so:

Code: [Select]

.WW
*WW
.WW

After designating both wheels, suspend construction of the one connected to the gear.  The second will still complete, but after some amount of time will deconstruct itself because it has no support.)

[Ashery]

Ah, so there's a time limit in there...also explains why my water wheel collapsed earlier (The axle leading to it had issues...kept getting suspended for some reason).

And I thought for sure that the screw pumps didn't require solid ground underneath the solid square, but after testing it myself, you are indeed correct.