I recorded myself using a hand-grinder to grind come coffee beans, but it works for nearly any sort of grinding sound. Good for videos with machines and such.
Ive played this metalbox near my house at a church. Its like a square metallamp with no lightbulb in it, and recorded from the inside with a r-09. Processed in logic. Eastjutland, holme, århus, denmark.
Recorded using only an android phone and 'recording machine' app. The recording was made on the metal jetty at london greenwich a minute or so after the ferry had departed. The sound is of the metal plates of the walkway rubbing together as the jetty gently rises and falls on the swell. Eerie and atmospheric. Strangely quiet considering it was recorded in a major city.