Keep face away from front of device.
The Terrain Smasher is one of the Devices added by Thermal Expansion. It breaks blocks in front of it, and ejects the drops from its sides. While active, the Terrain Smasher attempts to break a block every 0.8 seconds (16 ticks).
If the Terrain Smasher cannot eject drops from broken blocks anywhere, it stops working until it can.