Deadbolt Lock

How it's made

Source

a key rotates a pin cylinder; 5 irregular 2–5 ms contacts excite small brass parts. Filtered noise models key rubbing, then a heavier steel bolt scraping its guide.

Body

brass contacts have inharmonic modes around 1.8, 3.1 and 4.7 kHz, damped in 18–40 ms. The bolt stop excites 430, 970, 2130 and 3620 Hz modes; the door mount adds a 185 Hz knock.

Envelope

pin contacts occupy 0–210 ms, sliding accelerates from 160 ms to a stop near 390 ms. A weaker detent seats 18 ms later; upper modes die first and the dry tail ends near 540 ms.

Motion

friction brightens as sliding speed increases, then collapses at the bolt stop.

Variation

seeded timing jitter, contact strength and mode tuning vary by a few percent. Travel controls action speed, mass lowers modes, wear adds drag and chatter, damping shortens ring.

Presets

smooth brass, heavy security bolt, worn cylinder and gentle lubricated turn alter timing, contact density, spectral balance and impact-to-friction ratio, not just output gain.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.