Angle Grinder Cutting Steel

How it's made

Source

a rotating abrasive disc cuts steel; broadband friction spans 450 Hz to 9 kHz, with 65-105 Hz grain chatter. A 170-220 Hz motor produces gear and commutator whine near 2-4 kHz.

Body

steel contact emphasizes moving inharmonic bands around 2.1, 3.4 and 4.9 kHz (Q 5-9). A damped 620 Hz band supplies workpiece body without a hollow room or added reverberation.

Envelope

an 8 s sustained cutting loop; pressure swells at 0.5 Hz and feed varies at 0.125 Hz. More pressure increases grinding and spark density while reducing motor pitch by up to 9 percent.

Events

650-2450 filtered micro-impulses per second represent abrasive grains and a spark shower; high-pass and low-pass filtering round the impulses and remove DC and ultrasonic fizz.

Modulation

slow seeded wander moves steel bands and motor speed; shallow shaft-rate modulation roughens the contact. A continuous motor remains beneath the intermittent-contact preset.

Variation

thin sheet is fast and bright, heavy bar slower and dense, light trim motor-forward, and interrupted feed repeatedly releases contact. Independent seeded streams colour each layer.

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