Hydraulic Press Stamp

How it's made

Source

a loaded hydraulic pump drives a ram, followed by die contact and sheet-metal deformation. Pump harmonics sweep from 430 to 780 Hz; filtered oil-flow noise swells during the 0.4–0.7 s stroke.

Impact

a 2 ms rounded contact excites a 65–110 Hz frame thud and a 35 ms broadband deformation burst. A quieter die-seat contact follows 19 ms later; this is one stamp, not a second blow.

Body

clamped steel rings in inharmonic modes at about 390, 670, 1030, 1530, 2230 and 3170 Hz. Low plate modes have 0.5–1.2 s T60; high modes decay faster. Frame modes damp within 0.3 s.

Envelope

hydraulic load rises, briefly sags at contact, then releases into a lower return whine. Plate vibration outlasts the pump; every layer fades naturally before a final 2.05 s safety fade.

Variation

seeded mode tuning varies by 1.5 percent and ram timing by 6 ms. Mass lowers frame pitch; sheet brightness changes modes and contact spectrum; damping controls ring time; stroke sets timing.

Space

dry close machinery, with no baked-in room reverb; all components share a centered image.

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