The Lumberjack is a machine that harvests and replants trees in a 16x16x16 area. It also turns the logs into planks.
The Lumberjack needs to be placed next to an engine and must be redstone powered.
When a chest is placed above it, it will deposit its output in that chest.
One must watch out not to place it near a building made out of logs, or else it will harvest those logs as well.