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[mattmoss]

I want to tear out a chunk of the mountain, clear it out. Suggestions on the quickest way to do this?

I figured I could dig out the lowest level, then channel all around it (on all levels), but if I recall, this will only drop the whole chunk down a Z-level, not completely collapse it / hollow it out.

Do I really need to dig out every level? If so, what do you think is the safest method? Digging it out as up/down stairs?

[Cruxador]

Channel out ramps.

[LeoLeonardoIII]

The wiki doesn't specify. I'm assuming that if you have multiple levels of floors that are already mined-out, collapsing them will result in all the intervening stone being crushed. Right?

So if I hollowed out the inside of a mountain, then supported everything with pillars and mined out around the edges, and then removed the bottom pillar, the whole thing would come craching right down and destroy most/all of the stones from the falling floors?

[darkflagrance]

The wiki doesn't specify. I'm assuming that if you have multiple levels of floors that are already mined-out, collapsing them will result in all the intervening stone being crushed. Right?

So if I hollowed out the inside of a mountain, then supported everything with pillars and mined out around the edges, and then removed the bottom pillar, the whole thing would come craching right down and destroy most/all of the stones from the falling floors?

Stone would be destroyed. Don't know about most; I've seen between 80% and 40% at various times, depending on the scale.

I'm not sure if up/down is viable, because you have to remove the up stair and then channel the down stair that remains, if you otherwise just designate "remove stair" you're left with hanging down stairs. On the other hand, ramps just murder fps.

[Warlord255]

Any amount of stone, when disconnected from solid ground, will fall as far as possible. I've dropped an entire hill down a pit that way.

[Draco18s]

Any amount of stone, when disconnected from solid ground, will fall as far as possible. I've dropped an entire hill down a pit that way.

The problem (with regards to the OP) is that its still a hill, and that the unmined stone remains intact, just in a different place.

[mattmoss]

Any amount of stone, when disconnected from solid ground, will fall as far as possible. I've dropped an entire hill down a pit that way.

The problem (with regards to the OP) is that its still a hill, and that the unmined stone remains intact, just in a different place.

Correct. I've tried dropping a large section before, and anything unmined remains intact, just lower.

I just wanted to see if anyone found a better way. Digging out ramps is pretty good, although occasionally I've brained a miner because of what was above the ramp now falls and lands on his head. It seems like digging up/down stairs might be even safer, though I have yet to test this.

But mostly, I was just hoping to avoid digging it all in one way or another.

[Cruxador]

Sadly, achieving your hope is impossible, with current dwarftech.

However, you could try seeing what happens when you drop an atomsmasher on a falling hill.

[ikkonoishi]

Stairs. They are the safest way to dig out large sections.

Once you dig the stairs you can channel each layer out from the top safely so long as you do one at a time.