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40d:Axle
Axles are used to transmit power from a windmill or water wheel to a pump or millstone. There are two types: vertical axles move power between z-levels; while horizontal axles move it around within a given level. Axles consume 1 unit of power per tile.
Construction
Horizontal axles can be constructed from the Machine Components ( b M ) screen with the h key, vertical with b M v. Changing direction requires a gear assembly at the corner between two perpendicular axles.
Horizontal axles require wood to construct, one log for 1-3 tiles length, two for 4-6, or three for 7-10. Vertical axles, however, require one log for every z-level.
Floor tiles will obstruct the transferrance of power over z-levels, thus channels need to be dug through every floor through which a vertical axle is being placed.