Steam Saw (Flaxbeard's Steam Power)

The Steam Saw is a tool from the Flaxbeard's Steam Power mod. The Steam Saw is a felling tool that is powered by steam. It must be wound up before use, and while it is spinning, will use steam. To spin it, the use button must be held down until the second durability bar is at the desired amount. It will never break. Steam will not be used when it mines blocks, but will instead be used when it is spinning. It can be filled with steam in the Steam Filler machine.

Technically, it can be used without being spun first, but it runs at such a slow speed that is entirely impractical.