Grind metal on a grinding machine in a factory: Listen & Download Grind metal on a grinding machine in a .mp3 Error! Change your browser, please! ⇓ Download Spectrograph ⚠ Compressor industry ⚠ On, Forklift, off, standby ⚠ Steam pump ⚠ Factory Atmosphere ⚠ Electric generator (hum) ⚠ Hammer knocking, Car factory, welding ⚠ Crusher ⚠ Robotic assembly line ⚠ Hydraulic activator ⚠ The atmosphere of the factory, rattling ⚠ Oil pump ⚠ ★★★★★