40d:Machinery

Machinery (including axles, gear assemblies, and screw pumps) acts differently from other constructions. It can be built in one of two states:

• Stable Foundation - The machinery is built on top of a floor, either natural or constructed.
• Hanging - The machinery is built attached to another piece of machinery. No additional support is required (except for screw pumps). The supporting machinery needs only to have been designated for the hanging machinery to be built. If the supporting machinery is canceled, disabled, or removed the hanging machinery will collapse to base materials.

Connections

• Windmills may only connect to machinery directly below their center tile.
• Water wheels may only connect to machinery on either side of their center tile.
• Screw pumps may connect to machinery from any tile in any direction. (However, the walkable tile of the screw pump MUST have a floor under it, so it cannot connect directly below the walkable tile unless the trick with gear assemblies connecting through floor can be made to work)^[Verify]
• Gear assemblies connect in all directions.
• Horizontal axles connect to either end.
• Vertical axles connect directly above and below.

Unusual behavior

• In the diagram below,

  1 should work fine,

  2 works as long as dwarves can reach the building site. Any tile adjacent to the windmill will do.

  3 is valid, but has no connection between the machinery, and

  4 can't be placed.

Side view

-	=	-		-	=	-			*				*
	*				*			-	=	-		-	=	-
	1				2				3				4

• A gear assembly which has been disconnected by a lever does not support machinery. No machinery can hang on top of it, and anything already hanging on it will fall apart. In 2 (above), disconnecting the gear assembly would dismantle the windmill and prevent another from being built until it was reconnected.
• Windmills built on floors can transfer power through them.