Gear Turn

How it's made

Source

meshing steel teeth strike and slide at 4-20 contacts/s. Each contact has a 0.6 ms attack, a 3-7 ms noise impact and a softer 12-35 ms sliding tail; twelve teeth form one shaft revolution.

Body

damped gear and housing modes at 340, 910 and 2130 Hz, scaled by wheel size, ring for 25-100 ms. Inharmonic, short modes give solid metal without a sustained bell-like resonance.

Layers

tooth clicks sit above 180-4200 Hz friction noise and a quiet 8th-order mesh vibration with its second partial. A broad 120-500 Hz bearing bed supplies weight without sub-bass rumble.

Envelope

continuous loaded rotation, not a start/stop. Shaft eccentricity modulates friction level and filter centre once per twelve contacts; tooth contact pressure adds faster grain.

Loop

6 s contains whole tooth cycles at integer contact rates; the renderer crossfades the seam.

Variation

seeded impact tuning varies by 2% and level by 12%; every third tooth is heavier. Speed, size, wear and load separate slow heavy, oiled, worn and compact fast mechanisms.

Space

dry, narrowly spread contact points; no environmental reverberation or motor startup.

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