How Machines Sing: Vibration Lessons by Eye and Ear

Field notes

The lessons move from repeating motion and frequency to shaft-speed 1X, harmonics, and bearing or gear signatures. One worked example converts a 10 g imbalance at a 100 mm radius and 3,600 rpm into 142 N; the page also explains that machine tones default to three octaves higher (×8) when small speakers cannot reproduce the original low frequency. The extracted text describes draggable controls and playback, though their operation is not confirmed by the available artifacts.